Adtech 4 Series User manual

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ADTECH 4 SERIES
CNC MAINTAINANCE USER MANUAL

ADTECH 4 series CNC System (maintainance Manual)
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Contents
1. Foreword .....................................................................................................................................3
2. System technical characteristics...................................................................................................3
2.1 System technical parameters.............................................................................................................. 3
2.3 System function................................................................................................................................. 5
2.3.1 Self-diagnosis ..........................................................................................................................................................5
2.3.2 Compensation ..........................................................................................................................................................5
2.3.3 Abundant instruction system....................................................................................................................................5
2.3.4 Full English menu operation & full screen edit.......................................................................................................6
2.3.5 Abundant error-correction functions........................................................................................................................6
2.3.6 Program exchange between CNC system and PC ...................................................................................................6
2.4 System operating condition ............................................................................................................... 6
3. Operation panel ...........................................................................................................................7
3.1 LCD/keypad...................................................................................................................................... 7
3.2 LCD brightness adjustment ............................................................................................................... 8
3.3 System menus ................................................................................................................................... 8
3.4 Operating keys................................................................................................................................ 10
4. Manual operation........................................................................................................................11
4.1 Returning to home point manually....................................................................................................11
4.2 JOG Function.................................................................................................................................. 13
4.3 Single step....................................................................................................................................... 13
4.4MPG................................................................................................................................................ 13
4.5 Manual auxiliary function operation................................................................................................ 14
4.6 Tool setting ..................................................................................................................................... 15
4.6.2 tool setting gauge...................................................................................................................................................17
4.7 Data settings.................................................................................................................................... 18
4.7.1 Tool compensation setting .....................................................................................................................................18
4.7.2 System parameter setting.......................................................................................................................................19
4.8 System shoutcut key operation......................................................................................................... 19
5. Automatic operation...................................................................................................................20
5.1 Memory operation........................................................................................................................... 20
5.2 MDI operation................................................................................................................................. 20
5.3 USB disk(flash drive) DNC............................................................................................................. 20
5.4 Speed rate adjustment...................................................................................................................... 21
5.5 Run idle .......................................................................................................................................... 21
5.6 SBK function .................................................................................................................................. 21

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5.7 BDT function.................................................................................................................................. 22
5.8 Stopping automatic operating.......................................................................................................... 22
6. Safe operation.............................................................................................................................23
6.1 Emergency stop............................................................................................................................... 23
6.2 Hard limit over travel...................................................................................................................... 23
6.3 Soft limit over travel........................................................................................................................ 23
7. Alarm and self- diagnosis function............................................................................................24
7.1 NC program execution alarm........................................................................................................... 24
7.2 System environment alarm .............................................................................................................. 25
7.3 Alarm processing............................................................................................................................. 27
7.4 Self-diagnosis function.................................................................................................................... 27
8. Program saving & editing...........................................................................................................28
8.1 Saving the program to the memory.................................................................................................. 28
8.1.1 Keypad input (new program).................................................................................................................................28
8.1.2 PC serial port input................................................................................................................................................28
8.1.3 Copy program from USB disk...............................................................................................................................28
8.2 Reading programs into work area .................................................................................................... 29
8.2.1 Reading programs from controller into work area.................................................................................................29
8.2.2 Reading programs from USB disk into work area.................................................................................................29
8.3 Editing & modifying programs........................................................................................................ 29
8.4 Deleting files................................................................................................................................... 29
8.4.1 Deleting files in memory .......................................................................................................................................29
9 Main interfaces of the controller................................................................................................31
9.1 Position interface............................................................................................................................. 31
9.2 Edit interface................................................................................................................................... 33
9.3 MDI interface.................................................................................................................................. 34
9.4 File management............................................................................................................................. 35
9.5 Graph simulation............................................................................................................................. 36
9.6 Parameter interface.......................................................................................................................... 37
9.7 Compensation interface................................................................................................................... 40
9.8 workpiece coordinate system setting interface.................................................................................. 41
9.9 Controller diagnosis interface (DGNOS) ......................................................................................... 44
9.10 Macro variable view interface (macro variable) ............................................................................. 44
9.11 Current modal instruction info....................................................................................................... 45
10.System maintenance.................................................................................................................46
10.1 Retoot ........................................................................................................................................... 46

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10.2 System upgrade............................................................................................................................. 46
10.3 Reset parameters to default value................................................................................................... 46
10.4 Parameter backup and recover....................................................................................................... 46
10.5 Entering BIOS............................................................................................................................... 47
11.System parameters....................................................................................................................48
11.1 Parameter index list....................................................................................................................... 49
11.2 Genal parameters (P1.) .................................................................................................................. 63
11.3 Axis parameter configuration (P2.) ................................................................................................ 74
11.4 Management parameters (P3.) ....................................................................................................... 90
11.5 Tool magazine parameters (P4.)..................................................................................................... 96
11.6 spindle parameters (P5.) ................................................................................................................ 96
11.7 Port configuration (P6.)................................................................................................................101
12 interface definition and connection........................................................................................104
12.1 Interface definition.......................................................................................................................104
12.1.1. 49 series controller interface.........................................................................................................................104
12.1.2. 49serise Mounting dimensions.........................................................................................................................105
12.1.3. Installation precautions.....................................................................................................................................106
12.2 Port definition ..............................................................................................................................107
12.2.2 Input port(XS7)..................................................................................................................................................110
12.2.3 Output port (XS8) ..........................................................................................................................................112
12.2.4 MPG port........................................................................................................................................................115
12.2.5 Spindle port....................................................................................................................................................116
12.2.6 RS232 port definition.....................................................................................................................................118
12.2.7 USB memory (flash drive) port ---XS10 .......................................................................................................118
12.2.8 PC USB port ---XS11 ....................................................................................................................................118
12.3 Electrical connection diagram.......................................................................................................119
12.3.1 Electrical Symbol...............................................................................................................................................119
12.3.2 Main Power connection diagram.......................................................................................................................120
12.3.3 Servo drive connection diagram........................................................................................................................121
12.3.4 Step connection diagram....................................................................................................................................122
12.3.5 ADT9163 PCB board.........................................................................................................................................123
13 how to load program (CNC OR NC file ).....................................................................................130
14 how to upgrade software...............................................................................................................133
15 ATC Function................................................................................................................................135

1
Basic Information
This Manual is written by Adtech (Shenzhen) Technology Co., Ltd.
This Manual is edit by: Xue Zhen Yan
This Manual was first released on 27th Aug, 2013, version No.A0101 and item
number BZ001B092A
Copyright Notice
The property rights of all the parts of the manual belong to Adtech (Shenzhen) Technology
Co., Ltd. (Adtech for short), and any form of imitation, copying, transcription or translation
by any company or individual without the permission is prohibited. This manual does not
include any form of assurance, standpoint expression, or other intimations. Adtech and the
stuffs have no responsibility for any direct or indirect disclosure of the information, benefit
loss or business termination of this manual of the quoted product information. In addition,
the product and the information mentioned in this manual are for reference only, and the
content is subject to change without notice.
ALL RIGHTS RESERVED!
Adtech (Shenzhen) Technology Co., Ltd.

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●
Routine Inspection
Routine
Confirm environmental temperature, humidity, dust, or
foreign objects.
● Confirm abnormal vibration and noise;
● Check whether vents are blocked by yarn etc.
Regular Check
One year
● Check whether solid components are loose
● Confirm whether terminal block is damaged
Precautions and Explanations
※Transport and storage:
Do not stack product package more than six layers;
Do not climb, stand on or place heavy stuff on the product package;
Do not pull the cable still connecting with machine to move product.
Forbid impact and scratch on the panel and display;
Prevent the product package from humidity, sun exposure,and rain.
※Open-box inspection:
Open the package to confirm the product to be purchased byyou.
Check damages situation after transportation;
Confirm the integrity of parts comparing with the parts list or damages situation;
Contact our company promptly for discrepant models, shortage accessories, or transport
damages.
※ Wiring
Ensure the persons involved into wiring and inspecting are specialized staff;
Guarantee the product is grounded with less than 4Ω grounding resistance. Do not use
neutral line (N) to substitute earth wire.
Ensure grounding to be correct and solid, in order to avoid product failures or unexpected
consequences;
Connect the surge absorption diodes to the product in the required direction, otherwise, the
product will be damaged;
Ensure the power switch is OFF before inserting or removing plug,or disassembling
chassis.
※Overhauling
Ensure the power is OFF before overhauling or components replacement;
Make sure to check failures after short circuit or overloading, and then reboot the machine
after troubleshooting
Do not allow to frequently connect and disconnect the power, and at least one minute
interval between power-on and power-off.
※ others
Do not open housing without permit;
Keep power OFF if not in use for a long time;
Pay close attention to keep dust and ferrous powder away from control;
Fix freewheel diode on relay coil in parallel if non-solid state relay is used as output relay.
Check whether power supply meets the requirement to ensure not burning the control.
Install cooling fan if processing field is in high temperature, due to close relationship
between service life of the control and environmental temperature. Keep proper operative
temperature range for the control: 0℃ ~ 60℃.
Avoid to use the product in the overheating, humid, dusty, or corrosive environments;
Add rubber rails as cushion on the place with strong vibration.
※Maintenance:
Please implement routine inspection and regular check upon the following items, under the General
usage conditions (i.e. environmental condition: daily average 30℃, load rate: 80%, and operating rate:
12 hours/ day)

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Function
Name
Specification
4 axes (CNC4940 series)
Control axis
6 axes (CNC4920 series)
4 axis linear interpolation (CNC4940
Control axis
series)
Simultaneous control axes
6 axis linear interpolation (CNC4960
series)
Minimum setting unit
0.001mm
Input instruction
Minimum moving unit
0.001mm
Maximum instruction value
±9999.999 mm
X axis, Y axis, Z axis, A axis: B axis, C
Fast feeding speed
axis 9999 mm/min (maximum)
Feeding
Per minute
1~9999mm/min
Feeding speed range
Per rotation
1~500rpm
Automatic acceleration/deceleration
Yes
1. Foreword
CNC49 series cnc controllert developed by Adtech (Shenzhen) CNC Technology Co., Ltd. for milling
machines and machining centers, CNC4940 is four axis motion controller and CNC4960 is six axis motion
controller.
Instructions and reading convention of the Manual
Before using this CNC system, please read this Manual carefully to operate properly.
Terminology note and reading convention in this Manual:
CNC4940 and CNC4960 are the controller with different axis and same hardware.
― CNC system ‖ , ―N C controller ‖ and ― CNC49XX ‖ mentioned in this Manual all refer to CNC4940/4960
The articles marked with ― Caution ‖ prompt users to pay special attention for operation or setting, or else this
operation may fail or certain action can‘t be performed.
2.System technical characteristics
2.1 System technical parameters

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Function Name Specification
Feeding speed rate 10~150%
Jog feeding, Yes
Manual Returning to reference point manually
All control axis return to reference point
simultaneously
(allow setting order of priority)
Single step/handwheel function Yes
Interpolation Positioning, linear interpolation, arc G00, G01, G02/G03
interpolation
Operating mode MDI, auto, manual, single step, edit Yes
Testing function Test run, single program section, Handwheel Yes
Coordinate system and
pause
Pause (sec/ms)
Coordinate system setting
Automatic coordinate system setting
G04 X/P_
G92 (M series)
Yes
Safe functions Soft & hard limit check
Emergency stop
Yes
Yes
Program storage Program storage capacity, storagequantity
Capacity: 128MB
100 work areas
No limit on processing file quantity
Program edit Insert, modify, delete, cancel
Program edit Program No., sequence No., address, Yes
character retrieval
Decimal point programming Yes
800×640 pixels 10‖ LCD
Display
Position screen, program edit
Tool compensation setting, alarm display
Handwheel test, diagnosis interface
Parameter setting, graphic simulation
Yes
M, S, T function
Auxiliary function
Spindle
M code
S0-S15 (gear position control)
S15-S99999 (analog)

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2.3 System function
2.3.1 Self-diagnosis
Diagnose CPU, memory, LCD, I/O interface, parameter state, coordinates and processing program
Generally every time when the system power on; diagnose power supply, spindle, limit and I/O ports during
operating.
2.3.2 Compensation
Automatic backlash compensation
Automatic tool length compensation
Automatic tool radius compensation
Automatic tool radius biasing and automatic tool tip transition
2.3.3 Abundant instruction system
Scaling instruction
Mirror processing instruction
Tool biasing instructions
Program cycle, program skip, program shift, program transfer, different end processing modes, macro
definition and program management instructions
Fixed-point instructions: starting point, setting point, etc.
Linear, arc and spiral interpolation instructions
Six workpiece coordinate systems, nine extension coordinate systems and one reference point
Function
Name
Specification
Tool function
T code
Tool compensation memory
30 tools length, radius compensation
Compensation function
Reverse clearance compensation
Yes
Measurement centered
Yes
Automatic tool regulator
Other functions
Specify arc radius R/center position
Yes
Electronic gear ratio
Yes

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Operating voltage
24V DC (with filter)
Operating temperature
0℃—45℃
Optimum operating temperature
5℃—40℃
Operating humidity
10%——90% (no condensing)
Optimum operating humidity
20%——85%
Storage temperature
0℃—50℃
Storage humidity
10%——90%
No excessive dust, acid, alkali, corrosive and explosive gases, no strong
Operating environment
electromagnetic interference
2.3.4 Full English menu operation & full screen edit
4940/4960 CNC system uses cascading menu structure and full English operation to ensure simple
operation and visibility.
2.3.5 Abundant error-correction functions
Point out the nature and correct the errors in operation.
2.3.6 Program exchange between CNC system and PC
Perform CAD/CAM/CAPP auxiliary programming with abundant software in PC, and then load G code
program to the controller through communication interface (USB disk, RS232 interface), or transmit the
programs from the controller to PC.
2.4 System operating condition

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3. Operation panel
3.1 LCD/keypad
Keypad
Note:
Press the submenu buttons to perform the operations of submenus.
JOG axis moving and edit & input are composite. It has different definitions according to the modes.
System working mode switch section is used to switch working modes, which can improve the security
and system performance. Handwheel and single step mode are switched with Repeat button.
LCD unit

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[Monitor]
[Position]
[Abs]
[Rel]
General
[Path]
Tracking
[Preview]
[MDI]
Note:
Screen info shows the information of current window
Working mode info shows currently selected working mode
System main screen shows current main screen.
The submenu options are used to switch submenus with left triangle, F1~F6 and right triangle. The right
arrow is used to turn pages, and the left arrow is used to close the submenus in next level and previous menu.
3.2 LCD brightness adjustment
CNC49XX doesn‘t support brightness adjustment.
3.3 System menus
CNC49XX system uses cascading menu structure. You can press the following keys to operate the menus.
Press a key to show the corresponding content in the bottom of the LCD.
Key on the left: Return to previous menu
Key in the right: Turn pages to show other menus of same level
The main menus of the system include [Monitor], [prog], [Para], [Coord] and [Dgnos]. Each main menu
contains several submenus, which are shown below:

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[Para]
[General]
[Axis]
[Manage]
[Tool ]
spindle]
[Port]
Coord
[Coord
[Exp]
[Set]
[HALVE]
[Tcheck]
[Measure]
[Prog]
Edit]
[Check]
[CAM ]
[Save as]
[File]
[Del line]

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Key
Purpose
[RESET]
Cancel alarm, reset CNC
Address/number keys
Enter letters, numbers, etc.
[EOB], [CAN]
Confirm or cancel operation
[EOB], [CAN], [DEL]
Program edit (insert, delete, modify)
Mode switch key
Select operation mode
Cursor moving key
Four keys are available: Up/Down: adjust ration, move
cursor between subsections; Left/Right: move cursor to
left/right
Page key
Up/Down: Turn pages
Menu keys
Select the menus
Spindle cw rotation
Press it to rotate spindle cw, and press it again to stop
rotating
Spindle ccw rotation
Press it to rotate the spindley ccw, and press it again to
stop rotating
Coolant
Coolant on/off
Lubricant
Lubricant on/off
[BDT]
Block delete on/off
[SBK]
Single block function on/off
[PAUSE]
Pause automatic running
[START]
Start automatic running
3.4 Operating keys
The keys of CNC49XX system are defined below:
[Dgnos]
[Alert]
[Input]
[Output]
[Module]

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4.Manual operation
4.1 Returning to home point manually
CNC machine has special mechanical position, which is called as home point and for tool exchange and
coordinates setting. Generally, after power on ，the tool should be moved to the home point. This operation is
also called as go home operation, which will make the CNC system confirm the origin of machine.
The home operation includes program and mechanical mode:
For program home, the action completes when the coordinates of machine are 0, and won‘t check
whether home sensors are at position or not;
For mechanical home, the external home sensors are used to locate the origin of the machine ; two
checking modes are available:
With the external sensor switch, the go home operation completed when the sensor sensing is successful
The external sensors are used as deceleration switch, the servo home is enabled as home signal after
sensed and then stop
You can set the ― Home mode ‖ in [Parameter][General], in which 0 (default) indicates program and 1
indicates mechanical. You can also press [SBK] key in home mode to switch among ― Mechanical –Program –
Mechanical…‖ quickly. This method doesn‘t conflict with parameter setting.servo home as the home signal,
you need to set ― Axis phase Z home enable ‖ to ― 1 ‖ in [Parameter][Axis] in mechanical home mode, and the
setting will take effect in next home checking.
Several methods are available for tool returning to reference point and the steps as follow:
⑴Each axis returns to home point separately
➢Press the mode switch key [Home] to select home operation;
➢Press the composite key [X-], [Y-], [Z-], [A-],[ B-],[C-] at the numbers section to return the corresponding axis to
reference point.
⑵All axis return to reference point simultaneously
➢Press the mode switch key [Home] to select home operation;
➢Press the [Start] key ,after Z axis return to home point, then other axis return to hoime point simultaneously. The
automatic home sequence can be configured in the parameters.
⑶Reset machine tool position

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➢Press the mode switch key [Home] to select home operation;
➢In [Absolute Position] and [Coordinate System] screen, press [X], [Y], [Z], [A],[ B],[C]respectively to show the value
of corresponding axis position, and then press the [Cancel] key to reset the machine position of current axis, i.e.
current positions are used as machine origin position. After this operation, the system considers it as a home action.
Therefore, when the program is running, the alarm of not home won‘t occur. If you press by mistake, it will switch
the screen and cancel selection automatically.
⑷Reset relative position manually
➢Press the mode switch key [Manual] to select manual operation;
➢In [Relative Position] and [Coordinate System] screen, press [X], [Y], [Z], [A] ,[ B],[C] respectively to show the
value of corresponding axis, and then press the [Cancel] key to reset the relative position of currentaxis.
Note
The tool also can return to home point according to program instruction, i.e. returning tohome point automatically.
Caution:
General ly, the system should do go home operation after power on. If the power off while the machine is working, the
controller also will return to home point when the power on again. So Return to Z axis firstly for preventing tool and workpiece
from colliding and damaging them
.

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4.2 JOG Function
Press the keys on the operation panel or handwheel to move the tool along every axis.
The operation follows:
⑴Press the mode switch key [Manual] to select manual operation;
⑵ Press composite keys [X+], [X-]; [Y+], [Y-]; [Z+], [Z-]; [A+], [A-] [B+], [B-]; [C+], [C-] in numbers
area to move the tool along selected axis. The keypad follows:
In Jog mode, 5# key can be used to switch the Jog speed and rapid move speed. The rapid move speed of
each axis depends on General parameter 009-012 (fastspeed setting). After switching to rapid move speed, the
Jog speed of the position interface will be highlighted, while the actual speed of the position interface is
sampled from the moving speed of current axis. This value can truly reflect the moving speed of current axis
(unit: mm/min);
Note
Only single axis motion is available at Jog mode.
4.3 Single step
Single step mode is similar to Jog mode, the operations are same, but only moves a specified pulse
increment every time when press the key.
The operation as follows:
⑴ Press the mode switch key [MPG/ step] (this key is composite, and you can press it repeatedly to
switch the modes) to select the single step operation;
⑵ Press composite keys [X+], [X-]; [Y+], [Y-]; [Z+], [Z-]; [A+], [A-] [B+], [B-]; [C+], [C-]in numbers area to
move the tool for a fixed distance via the selected axis. This distance is controlled by four rates (1.000, 0.100,
0.010, 0.001) (unit: mm). To select pulse increment, press Up (+) and Down (-) key in the [Position] interface
4.4 MPG
In MPG mode, rotate the handwheel to make the machine perform single step or continuous motion.
Determine the feed by testing the handwheel signal of the handheld box. In MPG mode, the feeding axis and
feeding unit are determined by the axis selection signal of the handheld box.
The MPG feeding step follows:
⑴Press the mode switch key [MPG/ step] to select MPG operation;
⑵Rotate the switch on the handwheel to select axis (X, Y,Z, A,B,C);

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⑶Rotate the increment switch on the handwheel to select the moving amount (0.1, 0.01, 0.001);
⑷ Rotate the handwheel to move the machine. The tool moves certain distance acoording to the
handwheel scale setting. (For example, if you select X axis in step ⑵and select 0.01 in step ⑶, the tool moves
0.01mm every scale). Rotate the handwheel continuously to move each axis continuously.
Note
The MPG mode controls only one axis every time; the faster the handwheel rotates, the faster the machine tool moves.
4.5 Manual auxiliary function operation
Coolant on/off
at MPG/step/Jog mode, press this key to switch on/off the coolant.
Key indicator: No matter in what mode, the key indicator is on if only the coolant is on, or else the
indicator is off.
Lubricant on/off
at MPG/step/Jog mode, press this key to switch on/off the lubricant.
Key indicator: No matter in what mode, the key indicator is on if only the lubricant is on, or else the
indicator is off.
Spindle CW/stop
In at MPG/step/Jog mode, press this key to rotate the spindle cw and press it again to stop
Key indicator: No matter in what mode, the key indicator is on if only the principal axis is positive
rotating, or else the indicator is off.
Spindle CCW/stop
In at MPG/step/Jog mode, press this key to rotate the spindle ccw and press it again to stop
Key indicator: No matter in what mode, the key indicator is on if only the principal axis is reverse
rotating, or else the indicator is off.

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General instructions for manual operation keys
Cooling, lubricant, spindle cw/ccw are available in MPG, single step and Jog mode;
When the spindle is rotating, press the reverse rotation key, the Spindle will stop first, then rotate to the
reverse direction after pressing it again.
When auxiliary output is on, if the system is switched to other modes, the output is unchanged; you need
to press ― Reset ‖ key to switch it off, execute the corresponding M code in automatic mode or execute the
corresponding M code in MDI interface to turn off the output;
When the spindle work cw/ccw and execute M04/M03 directly, the system first stops cw/ccw rotating and
then execute M04/M03 code;
cw/ccw rotating of spindle is stopped while emergency stop pressed, and other outputs can be set
according to system parameters.
4.6 Tool setting
Tool setting is the main operation and important skill for CNC machine operater Under certain conditions,
tool setting precision can determine the precision of parts, and the tool setting efficiency also affects the CNC
processing efficiency directly.there is two ,methods for cnc machine tool setting , i.e. centered and tool setting
gauge
4.6.1 Centered
The centered function is that the system calculates the center position of the workpiece automatically
while tool setting to realize segment centered, rectangle centered and circle center location.
Note
In the tool setting operation below, if the auxiliary parameters of the coordinate system doesn‘t need setting, the first three
steps can be omitted. Please refer to chapter 9.5 for auxiliary parameters of the coordinate system.
⑴ Single axis centered
➢Select the edit mode;
➢Select MPG or Jogl mode;
➢Press [Coord] to enter coordinate system setting interface;
➢Press the left/right arrow to move the cursor to select coordinate system;
➢Press [HALVE] to enter centered interface;

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➢Move the tool to make its side blade touch side Asurface of the workpiece, and press [EOB] to record boundary point
1;
➢Move the tool to make its side blade touch side B surface of the workpiece, and press [EOB] to record boundary point
2;
➢Press [EOB] to calculate the coordinates of center point;
➢If all are ok , press [EOB] again to return the result to specified coordinate system.
⑵ Square centered
➢Select the edit mode;
➢Select MPG or Jogl mode;
➢Press [Coord] to enter coordinate system setting interface;
➢Press the left/right arrow to move the cursor to select coordinate system;
➢Press [HALVE] to enter centered interface;
➢Move the tool to make its side blade touch side A surface of the workpiece, and press [EOB] to record boundary point
1;
➢Move the tool to make its side blade touch side B surface of the workpiece, and press [EOB] to record boundary point
2;
➢Record boundary point 3.4 in the same method;
➢Press [EOB] after recording all boundary points to calculate the coordinates of center point;
➢If all are ok, press [EOB] again to return the result to specified coordinate system.
⑶ Plane circle (XY plane) centered
Circle centered has two modes, which are three points and two points with specified radius; If the user
only types two coordinates in the option of workpiece boundary point and specifies one value for R, the system
will determine the circle center with two points and radius automatically; if the user types coordinates of three
points in the option of workpiece boundary point, the system will determine the circle center with three points
and shield R.
➢The centered step of three points arc follows: