GSK GSK988TA User manual

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I
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.

GSK988TA/GSK988TA1/GSK988TB Turning Center CNC System User Manual【Programming & Operation】
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II
Preface
Your Excellency,
We are honored by your purchase of this GSK988TA/988TA1/988TB
Turning CNC System made by GSK CNC Equipment Co., Ltd.
This book describes GSK988TA/988TA1/988TB Turning Center CNC
System, Programming and Operation （software version: V1.12）, and
concretely introduces the programming and operations.
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!

Notes
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.

GSK988TA/GSK988TA1/GSK988TB Turning Center CNC System User Manual【Programming & Operation】
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All specifications and designs herein are subject to change without notice.
Warning
zBefore installing, connecting, programming and operating, please carefully read
the product user manual and the manual from the machine tool manufacturer and
strictly operate accordance with the regulations in the manual; otherwise, the
product or the machine tool may be damaged, the workpiece may get rejected,
even the personal injury may occur.
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 considered as unallowable.
Caution
zFunctions, technical indexes (such as precision and speed) described in this user
manual are only for this system. Actual function deployment and technical
performance of the machine tool are designed by the machine tool manufacturer,
so function configuration and technical indexes are subject to the user manual
from the machine tool manufacturer.
Refer to the user manual from the machine tool manufacturer for function and
meaning of each button on the machine panel.

Notes
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 message and advice for the users.
User’s Responsibility
——Be responsible for being familiar with and mastering the safety operation
procedures through training with the safety operation of the CNC system.
——Be responsible for the dangers caused by adding, changing or altering the original
CNC systems and the accessories.
——Be responsible for the dangers caused by failing to observe the provisions in the
manual for operation, adjustment, maintenance, installation and storage.
This manual is kept by the end user.
Thank you for supporting us in the use of GSK’s products!

GSK988TA/GSK988TA1/GSK988TB Turning Center CNC System User Manual【Programming & Operation】
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Contents
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Contents
Programming
Chapter 1 Programming Fundamental ................................................................3
1.1 Product Introduction...........................................................................................................3
1.2 CNC System of Machine Tools and CNC Machine Tools ..............................................6
1.3 Programming Fundamentals .............................................................................................7
1.3.1 Coordinates Definition .......................................................................................................................... 7
1.3.2 Increment System ................................................................................................................................. 8
1.3.3 Max. Travel............................................................................................................................................. 9
1.3.4 Reference Point................................................................................................................................... 10
1.3.5 Machine Coordinate System ............................................................................................................. 10
1.3.6 Workpice Coordinate System............................................................................................................ 10
1.3.7 Local Coordinate System................................................................................................................... 10
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.................................................................................. 15
1.4.5 Linear Axis and Rotary Axis............................................................................................................... 15
1.5 Structure of an NC Program ............................................................................................15
1.5.1 Program Name .................................................................................................................................... 17
1.5.2 Block Format........................................................................................................................................ 17
1.5.3 Word...................................................................................................................................................... 18
1.5.4 Block Number ...................................................................................................................................... 27
1.6 Program Run ...................................................................................................................... 27
1.6.1 Sequence of Program Run ................................................................................................................ 27
1.6.2 Execution Sequence of Word............................................................................................................ 28
Chapter 2 G Codes....................................................................................................29
2.1 Summary.............................................................................................................................29

GSK988TA/GSK988TA1/GSK988TB Turning Center CNC System User Manual【Programming & Operation】
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2.1.1 G code Classification.......................................................................................................................... 29
2.1.2 Omitting Word Input............................................................................................................................ 32
2.1.3 Relevant Definitions............................................................................................................................ 33
2.2 Rapid Traverse (Positioning) G00................................................................................... 33
2.3 Linear Interpolation G01................................................................................................... 34
2.4 Circular Interpolation G02, G03....................................................................................... 35
2.5 Spiral Interpolation G02, G03 .......................................................................................... 38
2.6 Dwell G04............................................................................................................................ 40
2.7 Cylindrical Interpolation 7.1............................................................................................. 41
2.8 Programmable Parameter Input G10.............................................................................. 45
2.8.1 Workpiece Coordinate System Offset.............................................................................................. 45
2.8.2 Setting a Workpiece Coordinate System’s Offset Amount............................................................ 46
2.8.3 Additional Workpiece Coordinate System Setting ......................................................................... 47
2.8.4 Automatically Inputting a Tool Life.................................................................................................... 47
2.8.5 Setting a Tool Offset Value ................................................................................................................ 48
2.9 Polar Coordinate Interpolation G12.1, G13.1 ................................................................ 49
2.10 Metric/Inch Switch G20, G21 ......................................................................................... 51
2.11 Stored Travel Check G22, G23....................................................................................... 52
2.12 Skip Interpolation G31 .................................................................................................... 53
2.13 Automatic Tool Offset G36, G37.................................................................................... 55
2.14 Reference Point Function .............................................................................................. 57
2.14.1 Reference Point Return G28........................................................................................................... 57
2.14.2 2nd, 3rd, 4th Reference Point Return............................................................................................ 58
2.15 Relevant Functions of Coordinate System ................................................................. 58
2.15.1 Selecting Machine Coordinate System Position G53.................................................................. 59
2.15.2 Workpiece Coordinate System Setting G50 ................................................................................. 60
2.15.3 Workpiece Coordinate System Selection G54～G59.................................................................. 61
2.15.4 Additional Workpiece Coordinate System G54.1......................................................................... 63
2.15.5 Local Coordinate System Setting G52 .......................................................................................... 64
2.16 Plane Selection Code G17～G19................................................................................... 66
2.17 Exact Stop Mode G61/Cutting Mode G64 .................................................................... 66

Contents
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2.18 Fixed Cycle Code.............................................................................................................67
2.18.1 Axial Cutting Cycle G90 ................................................................................................................... 67
2.18.2 Radial Cutting Cycle G94 ................................................................................................................ 70
2.19 Multiple Cycle Codes ......................................................................................................73
2.19.1 Axial Roughing Cycle G71............................................................................................................... 73
Monontone change is not observed along the Z axis ................................................1
2.19.2 Radial Roughing Cycle G72............................................................................................................ 80
2.19.3 Closed Cutting Cycle G73 ............................................................................................................... 84
2.19.4 Finishing Cycle G70.......................................................................................................................... 90
2.19.5 Axial Grooving Multiple Cycle G74................................................................................................. 90
2.19.6 Radial Grooving Multiple Cycle G75 .............................................................................................. 94
2.19.7 Notes for Multi Cycle Machining ..................................................................................................... 98
2.20 Threading Cutting............................................................................................................98
2.20.1 Thread Cutting with Constant Lead G32 ....................................................................................... 99
2.20.2 Thread Cutting with Variable Lead G34....................................................................................... 102
2.20.3 Thread Cutting Cycle G92 ............................................................................................................. 103
2.20.4 Multiple Thread Cutting Cycle G76 .............................................................................................. 106
2.21 Constant Surface Speed Control G96, Constant Rotational Speed Control G97
..................................................................................................................................................... 112
2.22 Feedrate per Minute G98/G94, Feedrate per Rev G99/G95 ..................................... 114
2.23 Drilling/Boring Fixed Cycle Code................................................................................ 115
2.23.1 End drilling cycle G83 /side drilling cycle G87............................................................................ 116
2.23.2 End Boring CycleG85 / Side Boring Cycle G89 ......................................................................... 121
2.23.3 Cancelling Drilling/Boring G80 ...................................................................................................... 122
2.23.4 Notes for Drilling/Boring Cycle ...................................................................................................... 123
2.24 Tapping Cycle Code ...................................................................................................... 123
2.24.1 Tapping Mode .................................................................................................................................. 123
2.24.2 End Rigid Tapping Cycle (G84) / Side Rigid Tapping Cycle (G88).......................................... 124
2.24.3 End Common Tapping Cycle G84/Side Common Tapping Cycle G88 ................................... 130
2.25 Automatic Chamfering Function................................................................................. 134
2.26 Function of Directly Inputting Graphic Dimension .................................................. 136
2.27 Macro Code .................................................................................................................... 140
2.27.1 Variable............................................................................................................................................. 140

GSK988TA/GSK988TA1/GSK988TB Turning Center CNC System User Manual【Programming & Operation】
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2.27.2 System Variable .............................................................................................................................. 142
2.27.3 Operation and Jump Code ............................................................................................................ 146
2.27.4 Macro Program Statement and NC Statement........................................................................... 151
2.27.5 Macro Program Call ....................................................................................................................... 151
2.28 Slant Axis Control ......................................................................................................... 154
2.29 G Code System B .......................................................................................................... 156
2.29.1 Differences of G Codes ................................................................................................................. 156
2.29.2 Absolute Code and Incremental Code G90, G91 ...................................................................... 157
2.29.3 Cycle Code Processing ................................................................................................................. 157
2.29.4 Drilling Fixed Cycle’s Return Operation G98, G99 .................................................................... 157
Chapter 3 MSTF Codes .......................................................................................... 159
3.1 M (Miscellaneous Function)........................................................................................... 159
3.1.1 End of Program M02 ........................................................................................................................ 159
3.1.2 End of Program Run M30................................................................................................................ 159
3.1.3 Program Stop M00............................................................................................................................ 159
3.1.4 Optional Stop M01 ............................................................................................................................ 160
3.1.5 Subprogram Call M98 ................................................................................................................... 160
3.1.6 Subprogram Call M198 .................................................................................................................... 161
3.1.7 Return from Subprogram M99 ..................................................................................................... 162
3.1.8 Standard M Codes for Standard Ladder........................................................................................ 163
3.1.9 Notes for M Codes............................................................................................................................ 164
3.2 Spindle Function ............................................................................................................. 164
3.2.1 Spindle Speed Analog Voltage Control.......................................................................................... 164
3.2.2 Spindle Override................................................................................................................................165
3.2.3 Multi-Spindle Control ........................................................................................................................ 165
3.3 Tool Function ................................................................................................................... 168
3.3.1 Tool Offset.......................................................................................................................................... 168
3.3.2 Tool Life Management...................................................................................................................... 172
3.3.2.1 Tool Life Management Data..................................................................................................... 172
3.3.2.2 Tool Life Time Count ................................................................................................................. 172
3.3.2.3 Tool Life Count Restarting M Code......................................................................................... 173
3.3.2.4 Tool Life Management Code in Machining Program ............................................................ 173
3.3.2.5 Automatically Inputting a Tool Life Data ................................................................................. 174
3.3.2.6 Process when the Tool Life End .............................................................................................. 176