GSK 988T User manual

In this user manual we have tried to describe the matters
concerning the operation of this CNC system to the greatest extent.
However, it is impossible to give particular descriptions for all
unnecessary or unallowable operations due to length limitation and
products application conditions；Therefore, the items not presented
herein should be regarded as “impossible” or “unallowable”.
Copyright is reserved to GSK CNC Equipment Co., Ltd. It
is illegal for any organization or individual to publish or reprint this
manual. GSK CNC Equipment Co., Ltd. reserves the right to ascertain
their legal liability.

GSK988T Turning CNC System User Manual
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Preface
Your Excellency,
We are honored by your purchase of this GSK 988T Turning CNC
System made by GSK CNC Equipment Co., Ltd.
This book is User Manual “Programming and Operation”.
To ensure safe and effective running, please read this manual carefully
before installation and operation.
Warning
Accident may occur by improper connection and operation！This
system can only be operated by authorized and qualified personnel.
Special caution:
The power supply fixed on/in the cabinet is exclusively used for the
CNC system made by GSK.
It can't be applied to other purposes, or else it may cause serious
danger!

Contents
III
Cautions
■Delivery and storage
●Packing box over 6 layers in pile is unallowed.
●Never climb the packing box, stand on it or place heavy objects on it.
●Do not move or drag the products by the cables connected to it.
●Forbid collision or scratch to the panel and display screen.
●Avoid dampness, insolation and drenching.
■Open-package inspection
●Confirm that the products are the required ones.
●Check whether the products are damaged in transit.
●Confirm that the parts in packing box are in accordance with the packing list.
●Contact us in time if any inconsistence, shortage or damage is found.
■Connection
●Only qualified personnel can connect the system or check the connection.
●The system must be earthed, and the earth resistance must be less than 0.1Ω.
The earth wire cannot be replaced by zero wire.
●The connection must be correct and firm to avoid any fault or unexpected
consequence.
●Connect with surge diode in the specified direction to avoid damage to the
system.
●Switch off power supply before plugging out or opening electric cabinet.
■Troubleshooting
●Switch off power supply before troubleshooting or changing components.
●Check the fault when short circuit or overload occurs. Restart can only be done
after troubleshooting.
●Frequent switching on/off of the power is forbidden, and the interval time should
be at least 1 min.

GSK988T Turning CNC System User Manual
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ANNOUNCEMENT!
zThis manual describes various possibilities as much as possible. However,
operations allowable or unallowable cannot be explained one by one due to
so many possibilities that may involve with, so the contents that are not
specially stated in this manual shall be regarded as unallowable.
WARNING！
zPlease read this manual and a manual from machine tool builder carefully
before installation, programming and operation, and strictly observe the
requirements. Otherwise, products and machine may be damaged,
workpiece be scrapped or the user be injured.
CAUTION！
zFunctions, technical indexes (such as precision and speed) described in
this user manual are only for this system. Actual function configuration and
technical performance of a machine tool with this CNC system are
determined by machine tool builder’s design, so functions and technical
indexes are subject to the user manual from machine tool builder.
zThough this system adopts standard operation panel, the functions of the
keys on the panel are defined by PLC program (ladder diagram). It should be
noted that the keys functions described herein are for the standard PLC
program (ladder diagram).
zFor functions and effects of keys on control panel, please refer to the user
manual from machine tool builder.

Contents
V
Safety Responsibility
Manufacturer’s Responsibility
——Be responsible for the danger which should be eliminated and/or controlled on
design and configuration of the provided CNC systems and accessories.
——Be responsible for the safety of the provided CNC systems and accessories.
——Be responsible for the provided information and advice for the users.
User’s Responsibility
——Be trained with the safety operation of CNC system and familiar with the safety
operation procedures.
——Be responsible for the dangers caused by adding, changing or altering to the
original CNC systems and the accessories.
——Be responsible for the failure to observe the provisions for operation, adjustment,
maintenance, installation and storage in the manual.
This manual is subject to change without further notice.
This manual is reserved by end user.
We are full of heartfelt gratitude to you for supporting us in the use of GSK’s products.

GSK988T Turning CNC System User Manual
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Contents
VII
Contents
ⅠPROGRAMMING ..........................................................................................................................1
Chapter I Programming Fundamentals ............................................................................................3
1.1 GSK988T Introduction ........................................................................................................3
1.2 CNC system of machine tools and CNC machine tools ......................................................5
1.3 Programming Fundamentals...............................................................................................7
1.3.1 Coordinates definition ...............................................................................................7
1.3.2 Increment system .....................................................................................................9
1.3.3 Max. travel ..............................................................................................................10
1.3.4 Reference position..................................................................................................10
1.3.5 Machine coordinate system ....................................................................................10
1.3.6 Workpice coordinate system................................................................................... 11
1.3.7 Local coordinate system ......................................................................................... 11
1.3.8 Interpolation function .............................................................................................. 11
1.4 Coordinate Value and Dimension......................................................................................12
1.4.1 Absolute programming and incremental programming ...........................................12
1.4.2 Diameter programming and radius programming ...................................................13
1.4.3 Decimal programming.............................................................................................14
1.4.4 Conversion between the metric and the inch..........................................................14
1.4.5 Linear axis and rotary axis ......................................................................................15
1.5 Structure of an NC Program..............................................................................................15
1.5.1 Program name ........................................................................................................16
1.5.2 Block format............................................................................................................16
1.5.3 Word .......................................................................................................................17
1.5.4 Block number..........................................................................................................26
1.5.5 Main program and subprogram...............................................................................26
1.6 Program Run ....................................................................................................................27
1.6.1 Sequence of program run .......................................................................................27
1.6.2 Execution sequence of word...................................................................................28
Chapter II G Commands ................................................................................................................29
2.1 Summary ..........................................................................................................................29
2.1.1 G command classification.......................................................................................29
2.1.2 Omitting word input.................................................................................................31
2.1.3 Related definitions ..................................................................................................33
2.2 Rapid Traverse (Positioning) G00.....................................................................................33
2.3 Linear Interpolation G01 ...................................................................................................34
2.4 Arc Interpolation G02, G03 ...............................................................................................35
2.5 Dwell G04 .........................................................................................................................38
2.6 Cylindrical Interpolation 7.1...............................................................................................39
2.7 Polar Coordinate Interpolation G12.1, G13.1....................................................................43
2.8 Metric/Inch Switch G20, G21 ............................................................................................45
2.9 Stored Travel Check G22, G23 .........................................................................................45
2.10 Skip Interpolation G31 ....................................................................................................46
2.11 Automatic Tool Offset G36, G37 ...................................................................................48
2.12 Reference Position Function...........................................................................................50

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2.12.1 Reference position return G28..............................................................................50
2.12.2 2nd, 3rd, 4th reference position return G30 .............................................................51
2.13 Related Function of Coordinate System .........................................................................52
2.13.1 Selecting machine coordinate system position G53 .............................................53
2.13.2 Workpiece coordinate system setting G50 ...........................................................54
2.13.3 Workpiece coordinate system selection command G54～G59.............................55
2.13.4 Local coordinate system setting G52....................................................................57
2.13.5 Level selection command G17～G19 ...................................................................59
2.13.6 Exact stop mode G61/cutting mode G64 ..............................................................59
2.14 Fixed Cycle Command ...................................................................................................60
2.14.1 Axial cutting cycle G90 .........................................................................................60
2.14.2 Radial cutting cycle G94....................................................................................... 63
2.15 Multiple Cycle Commands ..............................................................................................66
2.15.1 Axial Roughing Cycle G71....................................................................................66
2.15.2 Radial Roughing Cycle G72...............................................................................72
2.15.3 Closed Cutting Cycle G73 ....................................................................................77
2.15.4 Finishing Cycle G70 ............................................................................................. 82
2.15.5 Axial Grooving Multiple Cycle G74 .......................................................................83
2.15.6 Radial Grooving Multiple Cycle G75.....................................................................86
2.15.7 Notes for multi cycle machining ............................................................................89
2.16 Threading Cutting ...........................................................................................................90
2.16.1 Thread Cutting with Constant Lead G32...............................................................90
2.16.2 Thread cutting with variable lead G34 ..................................................................93
2.16.3 Thread cutting cycle G92......................................................................................95
2.16.4 Multiple thread cutting cycle G76..........................................................................97
2.17 Constant Surface Speed Control G96, Constant Rotational Speed Control G97.....103
2.18 Feedrate per Minute G98, Feedrate per Rev G99 ................................................... 105
2.19 Drilling/Boring Fixed Cycle Command ..........................................................................106
2.19.1 End drilling cycle G83 /side drilling cycle G87 ....................................................107
2.19.2 End Boring CycleG85 / Side Boring Cycle G89 .................................................. 111
2.19.3 Cancelling Drilling/Boring G80............................................................................ 112
2.19.4 Notes for Drilling/Boring Cycle............................................................................ 112
2.20 Tapping Cycle Command.............................................................................................. 112
2.20.1 Tapping Mode ..................................................................................................... 113
2.20.2 End Rigid Tapping Cycle (G84) / Side Rigid Tapping Cycle (G88)...................... 114
2.20.3 End Common Tapping Cycle (G84) /Side Common Tapping Cycle (G88) .......... 120
2.21 Automatic Chamfering Function....................................................................................123
2.22 Macro Command ..........................................................................................................126
2.22.1 Variable...............................................................................................................126
2.22.2 System variable ..................................................................................................127
2.22.3 Operation and jump command ...........................................................................131
2.22.4 Macro program statement and NC statement..................................................... 136
2.22.5 Macro program call.............................................................................................136
Chapter ⅢMSTF Commands..................................................................................................... 139
3.1 M (Miscellaneous Function)............................................................................................ 139
3.1.1 End of program M02.............................................................................................139

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3.1.2 End of program run M30.......................................................................................139
3.1.3 Program stop M00 ................................................................................................139
3.1.4 Optional stop M01.................................................................................................140
3.1.5 Subprogram call M98 .........................................................................................140
3.1.6 Subprogram Call M198.........................................................................................141
3.1.7 Return from Subprogram M99............................................................................141
3.1.8 The Following M commands for standard ladder(some functions modified by K
parameters)......................................................................................................................142
3.1.9 M Commands defined by standard PLC ladder ....................................................143
3.2 Spindle Function .............................................................................................................143
3.2.1 Spindle speed analog voltage control ...................................................................143
3.2.2 Spindle override ....................................................................................................144
3.3 Tool Function ..................................................................................................................144
3.3.1 Tool offset .............................................................................................................144
3.3.2 Tool Life Management ..........................................................................................147
Chapter IV Tool Nose Radius Compensation...............................................................................151
4.1 Application ......................................................................................................................151
4.1.1 Overview...............................................................................................................151
4.1.2 Imaginary tool nose direction ................................................................................152
4.1.3 Compensation value setting..................................................................................155
4.1.4 G40/G41/G42 command function .........................................................................156
4.1.5 Compensation direction ........................................................................................157
4.1.6 Cautions ...............................................................................................................159
4.1.7 Application ............................................................................................................160
4.2 Tool Nose Radius Compensation Offset Path.................................................................161
4.2.1 Inner and outer side..............................................................................................161
4.2.2 Tool traversing when starting tool .........................................................................161
4.2.3 Tool traversing in Offset mode ..............................................................................163
4.2.4 Tool traversing in Offset canceling mode ..............................................................168
4.2.5 Tool interference check.........................................................................................169
4.2.6 Commands for canceling compensation vector temporarily .................................171
4.2.7 Particulars.............................................................................................................174
ⅡOPERATION ...........................................................................................................................181
Chapter ⅠOverview.....................................................................................................................183
1.1 Operation Overview ........................................................................................................183
1.2 System Setting................................................................................................................184
1.3 Display ............................................................................................................................185
1.4 System............................................................................................................................187
1.4.1 System panel ........................................................................................................187
1.4.2 System key definitions ..........................................................................................188
1.5 Machine Operation Panel ...............................................................................................190
1.5.1 Division of machine operation panel .....................................................................190
1.5.2 State indicator and press key definition on the panel............................................191
Chapter ⅡPower on, Power off and Safety Protection ................................................................196

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2.1 Power on ........................................................................................................................196
2.2 Power off......................................................................................................................... 197
2.3 Overtravel Protection ......................................................................................................197
2.4 Overtravel Protection in Memory Travel Limit .................................................................197
2.5 Emergence Operation.....................................................................................................199
2.5.1 Reset ....................................................................................................................199
2.5.2 Emergency stop....................................................................................................199
2.5.3 Feed hold..............................................................................................................199
2.5.4 Cutting off power supply .......................................................................................199
Chapter ⅢWindows ...................................................................................................................200
3.1 Position Display Window ................................................................................................205
3.1.1 Absolute coordinate window ................................................................................. 206
3.1.2 Relative coordinate display...................................................................................207
3.1.3 Machine coordinate display ..................................................................................208
3.1.4 Comprehensive coordinate................................................................................... 208
3.1.5 Setting the relative coordinate ..............................................................................209
3.1.6 Switching between the mode and the comprehensive message ..........................210
3.1.7 Clearing workpiece count ..................................................................................... 211
3.1.8 Clearing run time .................................................................................................. 211
3.2 Program Window ............................................................................................................212
3.2.1 Local directory and U disk directory......................................................................212
3.2.2 MDI program......................................................................................................... 213
3.2.3 Item/times ............................................................................................................. 214
3.3 System Window ..............................................................................................................214
3.3.1 System parameter setting and rewriting window .................................................. 215
3.3.2 Screw pitch compensation setting and rewriting window ......................................218
3.3.3 System message and operation authority levels ..................................................219
3.3.4 System file management ......................................................................................222
3.3.5 Ladder diagram ....................................................................................................223
3.4 Setting Window...............................................................................................................229
3.4.1 Tool offset setting..................................................................................................229
3.4.2 CNC setting window .............................................................................................233
3.4.3 Macro variable window .........................................................................................238
3.5 Message Window ...........................................................................................................239
3.5.1 Alarm message check window .............................................................................240
3.5.2 Alarm record check window..................................................................................241
3.5.3 Diagnosis window.................................................................................................242
3.5.4 Oscillograph window.............................................................................................245
3.5.5 GSK-CAN window ................................................................................................248
3.6 Graph Window ................................................................................................................249
3.6.1 Setting graph parameter .......................................................................................249
3.6.2 Processing graph path.......................................................................................... 250
3.6.3 Simulation graph...................................................................................................251
3.7 Help Windows.................................................................................................................252
Chapter ⅣEditing and Managing a Program .............................................................................254

Contents
XI
4.1 Searching, Creating, Executing and Opening a Program ...............................................254
4.1.1 Searching a program ............................................................................................254
4.1.2 Creating a program...............................................................................................254
4.1.3 Executing a program.............................................................................................255
4.1.4 Opening a program...............................................................................................256
4.2 Renaming, Outputting, Deleting and Arraying Programs, Saving a Program as .............257
4.2.1 Renaming a program ............................................................................................257
4.2.2 Saving a program as.............................................................................................258
4.2.3 Deleting a program ...............................................................................................259
4.2.4 Outputting a program............................................................................................259
4.2.5 Arraying programs ................................................................................................260
4.3 Editing and Rewriting a Program ....................................................................................260
4.3.1 Editing a program .................................................................................................260
4.3.2 Rewriting a program .............................................................................................261
4.3.3 Shortcut key..........................................................................................................262
4.4 Block Comment...............................................................................................................263
4.5 Generating a Block Number............................................................................................263
4.6 Background Editing a Program .......................................................................................263
Chapter ⅤManual Operation .....................................................................................................264
5.1 Manual Reference Position Return .................................................................................264
5.2 Manual Feed...................................................................................................................265
5.3 Increment Feeding ..........................................................................................................266
5.4 MPG Feeding..................................................................................................................267
Chapter ⅥAuto Operation............................................................................................................270
6.1 Auto Running ..................................................................................................................270
6.1.1 Selecting the running program..............................................................................270
6.1.2 Program running ...................................................................................................271
6.1.3 Running from any block ........................................................................................272
6.1.4 Skip.......................................................................................................................272
6.1.5 G31 skip ...............................................................................................................273
6.1.6 Stop auto running..................................................................................................273
6.2 MDI Running...................................................................................................................274
6.2.1 Editing and running the program in MDI mode .....................................................274
6.2.2 Running from any block ........................................................................................275
6.2.3 Stop MDI running ..................................................................................................275
6.3 DNC Running..................................................................................................................275
6.4 Auto Running Control......................................................................................................278
6.4.1 Machine and miscellaneous function lock.............................................................278
6.4.2 Dry run..................................................................................................................279
6.4.3 Single block running .............................................................................................280
6.4.4 Feedrate override .................................................................................................280
6.4.5 Rapid traverse override ........................................................................................281
Chapter ⅦTool Offset and Setting Tools ....................................................................................282
7.1 Setting the Tool Offset and the Wearing Values..............................................................282

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7.1.1 Direct input method ..............................................................................................282
7.1.2 Measuring mode...................................................................................................283
7.1.3 +input mode.......................................................................................................... 284
7.1.4 C input method .....................................................................................................285
7.1.5 Clearing the offset value or the wearing value......................................................286
7.2 Fixed-Point Tool Setting..................................................................................................287
7.3 Trial Cut Toolsetting ........................................................................................................287
7.4 Position Record .............................................................................................................. 290
7.5 Automatic Tool Compensation ........................................................................................ 290
Chapter ⅧSetting and Display Graphs ...................................................................................... 292
8.1 Setting the Graph Parameter..........................................................................................292
8.2 Path Graph Display and Operation .................................................................................293
8.3 Simulation graph display and operation.......................................................................... 294
Chapter ⅨU disk Use ................................................................................................................296
9.1 Sending a Program.........................................................................................................296
9.2 Backup Value..................................................................................................................297
9.2.1 System file backup ...............................................................................................297
9.2.2 Servo parameter backup ......................................................................................298
Chapter ⅩProcessing Examples .................................................................................................301
10.1 Outer End Face Machining ...........................................................................................301
10.2 Compound Machining...................................................................................................304
Chapter ⅪParameters ...............................................................................................................310
11.1 Parameters Related to System Setting ......................................................................... 311
11.2 Parameters Related to Interfaces of Input and Output.................................................. 311
11.3 Parameters Related to Axis Control/Setting Unit........................................................... 311
11.4 Parameters Related to Coordinate System...................................................................315
11.5 Parameters Related to the Stroke Detection .................................................................317
11.6 Parameters Related to Feedrate...................................................................................320
11.7 Parameters Related to Control of Acceleration and Deceleration .................................324
11.8 Parameters Related to Servo and Backlash Compensation .........................................326
11.9 Parameters Related to Input/Output .............................................................................330
11.10 Parameters Related to Display and Editing.................................................................332
11.11 Parameters Related to Programming ..........................................................................334
11.12 Parameters Related to Screw Pitch Error Compensation ...........................................336
11.13 Parameters Related to the Spindle Control .................................................................339
11.14 Parameters Related to the Tool Compensation...........................................................344
11.15 Parameters Related to the Canned Cycle................................................................. 347
11.15.1 Parameter of the Drilling Canned Cycle............................................................347
11.15.2 Parameters Related to the Thread Cutting Cycle..............................................348
11.15.3 Parameters Related to the Combined Canned Cycle .......................................348
11.16 Parameters Related to the Rigid Tapping....................................................................349
11.17 Parameters Related to the Polar Coordinate Interpolation.......................................... 351
11.18 Parameters Related to the User Macro Program ........................................................352

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11.19 Parameters Related to Skip Function..........................................................................353
11.20 Parameters Related to Graphic Display ......................................................................355
11.21 Parameters Related to Run Hour and Parts Count Display.........................................355
11.22 Parameters Related to MPG Feed ..............................................................................356
11.23 Parameters Related to PLC Axis Control ....................................................................357
11.24 Parameters Related to Basic Function........................................................................360
11.25 Parameters Related to GSK-CAN Communication Function ......................................361
Appendix 1 Alarm List ..................................................................................................................363
1.1 Program Alarms (P/S Alarms) .........................................................................................363
1.2 Parameter Alarms ...........................................................................................................372
1.3 Pulse Encoder Alarms.....................................................................................................373
1.4 Servo Alarms ..................................................................................................................373
1.5 Overtravel Alarms ...........................................................................................................373
1.6 Spindle Alarms ................................................................................................................374
1.7 System Alarms................................................................................................................374
1.8 Communication prompt on the operation panel ..............................................................375
1.9 GSK-CAN Communication Prompts ...............................................................................375
1.10 Servo Inner Alarms .......................................................................................................377
Appendix 2 Standard Ladder Function Allocation.........................................................................381
2.1 X, Y Addresses Definition................................................................................................381
2.2 Standard Operation Panel...............................................................................................384
2.2.1 Address X .............................................................................................................384
2.2.2 Address Y .............................................................................................................386
2.3 Standard PLC Parameter Instruction ..............................................................................389
2.3.1 Parameter K..........................................................................................................389
2.3.2 Parameter DT .......................................................................................................390
2.3.3 Parameter DC.......................................................................................................391
2.3.4 Parameter D .........................................................................................................391
2.4 PLC(Address A) Alarms (the Followings are Referred to V2.03b)...................................392
Appendix 3 Installation.................................................................................................................394
3.1 GSK988T Appearance Dimension ..................................................................................394
3.2 Machine Operation Panel MPU02A of GSK988T............................................................395
3.3 Machine Operation Panel MPU02B Appearance dimension of GSK988T ......................396
3.4 GSK988T-H Appearance Dimension...............................................................................397
3.5 Appearance Dimension of GSK988T-H Operation panel ................................................397
Appendix 4 Operation List............................................................................................................399

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Chapter 1 Programming Fundamentals
1
ⅠProgramming
ⅠPROGRAMMING

GSK988T Turning CNC System User Manual
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ⅠProgramming

Chapter ⅠProgramming Fundamentals
3
ProgrammingⅠ
Chapter I Programming Fundamentals
1.1 GSK988T Introduction
GSK988T is exclusive to the slant bed CNC turning machine and turning center with the
horizontal and the vertical structures. It uses 400MHz high-performance process to control 5 feed
axes(including Cs axis) and 2 spindles, communicates with the servo unit through GSK-CAN serial
bus, and its matched servo motor uses the high-resolution absolute encoder to realize 0.1μm
position precision, which can meet the requirements of high-precision turning and milling compound
machining. It has the network interface to support the remote monitor and file transmission and to
meet the network teaching and workshop management. GSK988T is the best choice for the slant bed
CNC turning and turning center.
Fig. 1-1 GSK988T appearance
Technical characteristics
5 feed axes（including Cs axis）, 3-axis link, 2 analog spindles to realize the turning, milling compound
machining
Command unit 1μm and 0.1μm, max. speed 60m/min（max. speed 24m/min in 0.1μm）
Optional to GSK-CAN servo unit to read/write the servo parameter and monitor servo unit
Extended I/O unit and GSK-CAN axis through serial bus
Nested many PLC programs, on-line editing, real-time monitoring PLC ladder
Part programs edited on the background
Network interface, remote monitoring and file transmission
USB interface, U disc file operation, system allocation and software upgrading
8.4 inch truecolor LCD, two-dimensional motion path and solid graph display

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ⅠProgramming
Technical specifications
Controllable axes
Max. controllable axes：5（including Cs axis）
Max. link axes：3
PLC controllable axes：5
Feed axis function
Least command unit：0.001mm, 0.0001mm
Least command range：±99999999× least command unit
Rapid traverse speed：max. 60m/min in 0.001mm command unit, max. 24m/min in 0.0001mm
command unit
Rapid override：F0, 25%, 50%, 100% real-timing tuning
Cutting feedrate:
0.01 mm/min～60000 mm/min or 0.01 inch/min～4000 inch/min（G98: feed per minute）
0.01 mm/rev～500 mm/r or 0.01 inch/rev～9.99 inch/rev（G99: feed per revolution）
Feedrate override：0～150% 16-level real-time tuning
Interpolation mode: linear, arc, thread, polar interpolation, and rigid tapping
Thread function
Thread type: constant pitch straight thread/taper thread/end thread, variable pitch straight
thread/taper thread/end thread
Thread head：1~99 heads
Thread pitch：0.01mm～500mm（metric thread）or 0.01inch～9.99inch（inch thread）
Thread run-out：thread lenght, angle, speed can be set
Acceleration/deceleration function
Cutting feed: linear, exponential
Rapid traverse: linear
Thread cutting: linear, exponential
Initial speed, terminal speed and time of acceleration/deceleration are set by the parameter
Spindle function
2-channel 0V～10V analog voltage output，2-channel spindle encode feedback, double-spindle
control
Spindle speed: spindle speed specified by S or PLC signal, its range: 0rpm～20000rpm
Spindle override：50%～120% 8-level real-time tuning
Spindle constant surface control
Rigid tapping
Tool function
Tool length compensation（tool offset）：99 groups
Tool wear compensation：99 groups of tool wear compensation data
Tool nose radius compensation（C type）
Toolsetting mode: fixed-point toolsetting, trial-cutting toolsetting, reference position return toolsetting
Offset execution mode: modifying coordinate mode, tool traverse mode
Precision compensation
Backlash compensation: compensation range (-9999~9999)× check unit
Memory pitch error compensation：1024 compensation points，compensation point number of each is
set by the parameter, each point compensation range (-700~700) × check unit
PLC function
13 basic commands, 30 functional commands

Chapter ⅠProgramming Fundamentals
5
ProgrammingⅠ
PLC ladder on-line edit, real-time monitoring
2-level PLC program, up to 5000 steps, the 1st level program refresh period
Many PLC programs（up to 16 programs），the current running PLC program can be selected
I/O unit
Basic I/O：40 input /32 output
Operation panel I/O：96 input/96 output
Human-computer interface
Display in Chinese, English and others
Two-dimensional tool path and solid graph display
Servo state monitoring
Servo parameter on-line allocation
Real-time clock
On-line help
Operation management
Operation mode: Auto, Manual, Edit, MDI, DNC, MPG, Reference position return
Multi-level operation Authorization Management
Alarm log
Timed stop
Program edit
Program capacity：36M, 10000 programs（including subprogram and macro program）
Edit mode: full-screen edit, part program edit on the background
Edit function：searching, modifying and deleting program/block/word, copying/deleting block
Program format: ISO code, word without blank space, relative coordinates, absolute coordinate
compound programming
Macro command: statement macro command program
Program call: macro program call with parameters, 12-level subprogram nesting
Grammar check: executing the rapid grammar check for the program(do not run the program) after it
has been edit
Communication function
RS232 interface: part program and parameter transmission, DNC machining, upgrading PLC
program and system software U disc
USB：U disc file operation, U disc file directly machining, upgrading PLC program and system
software U disc
LAN：remote monitoring, network DNC machining, file transmission, remotely upgrading PLC
program, system software
Safety function
Emergency stop
Hardware travel limit
Many storage travel checks
Data backup and recover
1.2 CNC system of machine tools and CNC machine tools
CNC machine tool is an electro-mechanical integrated product, composed of Numerical Control
Systems of Machine Tools, machines, electric control components, hydraulic components, pneumatic
components, lubricating, cooling and other subsystems (components), and CNC systems of machine
tools are control cores of CNC machine tools. CNC systems of machine tools are made up of
computerized numerical control(CNC), servo (stepper) motor drive devices, servo (or stepper) motor

GSK988T Turning CNC System User Manual
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ⅠProgramming
etc.
Operational principles of CNC machine tools: according to requirements of machining technology,
edit user programs and input them to CNC, then CNC outputs motion control commands to the servo
(stepper) motor drive devices, and last the servo (or stepper) motor completes the cutting feed of
machine tool by mechanical driving device; logic control commands in user programs to control
spindle start/stop, tool selections, cooling ON/OFF, lubricant ON/OFF are output to electric control
systems of machine tools from CNC, and then the electric control systems control output components
including buttons, switches, indicators, relays, contactors and so on. Presently, the electric control
systems are employed with Programmable Logic Controller (PLC) with characteristics of compact,
convenience and high reliance. Thereof, the motion control systems and logic control systems are the
main of CNC machine tools.
The system has simultaneously motion control and logic control function to control two axes of CNC
machine tool to move, and has PLC function. Edit PLC programs (ladder diagram) according to
requirements of input and output control of machine tool and then download them to GSK988T
Turning Machine CNC system, which realizes the required electric control requirements of machine
tool, is convenient to electric design of machine tool and reduces cost of CNC machine tool.
Softwares used for controlling GSK988T Turning Machine CNC system are divided into system
software (NC for short) and PLC software (PLC for short). NC system is used for controlling display,
communication, edit, decoding, interpolation and acceleration/deceleration, and PLC system for
controlling explanations, executions, inputs and outputs of ladder diagrams.
Standard PLC programs are loaded (except for the special order) when GSK980TDa Turning
Machine CNC System is delivered, concerned PLC control functions in following functions and
operations are described according to control logics of standard PLC programs, marking with
“Standard PLC functions” in GSK980TDa Turning CNC System User Manual. Refer to Operation
Manual of machine manufacturer about functions and operations of PLC control because the
machine manufacturer may modify or edit PLC programs again.
Programming is a course of workpiece contours, machining technologies, technology parameters and
tool parameters being edit into part programs according to special CNC programming G codes. CNC
machining is a course of CNC controlling a machine tool to complete machining of workpiece
according requirements of part programs. Technical flow of CNC machining is shown in Fig. 1-2.