GSK GSK988TA, Manual

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GSK988TA/GSK988TA1/GSK988TB Turning Center CNC System User Manual 【 Programming & Operation 】
130
Ⅰ
Programming
Note 8 ： When the fixed cycle in the rigid tapping is cancelled, the S value used in the rigid tapping is also
cleared. (its state is the same with the specified S0). Namely, S used to specifiy the rigid tapping
cannot be used in the program following the fixed cycle program cancelling the rigid tapping.
Note 9
：
After the rigid tapping’s fixed cycle is cancelled, S is specified again according to requirements.
Note 10
：
N0.5209#0=0, i.e., “in the rigid tapping, the drilling axis is selected by the plane selection”. In
G84, when G17, G18, G19 is separately specified, the drilling axis is the basic axis X, Z, Y; in
G88, when G17, G18, G19 is separately specified, the drilling axis is the basic axis Y, X, Z.
Note 11
：
The left-hand thread rigid tapping is realized. When GSK988TA/TB G84/G88 rigid tapping’s tool
infeed is performed with default, the spindle rotates CW, when the rigid tapping’s tool retraction
is done, the spindle rotates CCW. In some special applications, when the tapping tool infeed is
needed, the spindle rotates CCW, but when the tapping’s tool retraction is performed, the
spindle rotates CW. When the left-hand thread tapping is executed, GSK988TA/TB uses the rigid
tapping’s spindle rotation direction selection signal
（
RGROD
，
i.e., G61.2 in PLC address
）
to
realize the left-hand thread tapping. Before G84/G88 rigid tapping is executed, the CNC checks
the state of rigid tapping’s spindle rotation direction selection signal to confirm the tapping
axis’ rotation direction. When RGROD signal is 0 and G84/G88 rigid tapping’s tool infeed is
executed, the spindle rotation CW; when the rigid tapping’s too retraction is performed, the
spindle rotates CCW, which is the normal thread tapping; when RGROD signal is 1 and the
tapping’s tool infeed is performed, the spindle rotates CCW; when the tapping’s tool retraction
is done, the spindle rotates CW, which is the left-hand thread tapping. After the CNC is turned
on, RGROD signal value is defaulted to 0.
During G84/G88 rigid tapping’s execution process, RGROD state cannot be changed. After G80,
RGROD state can be set again. Or it is set first before G84/G88 rigid tapping is executed.
RGROD is added to the ladder, which can realize the left-hand thread rigid tapping.
Program example
Suppose the current system is ISB, the least input increment is 0.001mm
G98 ；
Feed per minute mode
M29 S1000
；
Switch to the rigid tapping mode (very important), code the
spindle speed 1000 rev/min. After the block is executed, the
spindle does not start rotating.
G0 X50 Z0
；
X and Z position to the start point
G84 Z-50 P3000
F2000
；
The start point is X50 Z0 ， the hole position is the same with the
start point, the pause time is 3 seconds, and executing F value
and S value confirm the lead to 0. When Q value is not
executed, it is a standard rigid tapping cycle.
G80
；
The fixed cycle is cancelled and the driving tool stops rotation
M30 ；
End of program
2.24.3 End Common Tapping Cycle G84/Side Common Tapping Cycle G88
When G84/G88 is a common tapping mode, the system uses the miscellaneous function to
control the spindle Start/Stop
：
M03(the spindle rotation CW), M04(the spindle rotation CCW) and
M05(the spindle stop)
；
the CNC detects the spindle rotation by the spindle encoder and the tapping
axis rotates along with the spindle. When the machine cannot use the rigid tapping function, the
common tapping mode provides an economic tapping method.
When the system executes the common mode to tapping, the spindle must use a flexible chuck
or the tool use a variable screw tap.