GSK 988T, User Manual

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GSK988T Turning CNC System User Manual
120
Ⅰ
Programming
M28 ； suppose M28 is for the spindle cancelling rigid
tapping mode
M30 ； End of program
2.20.3 End Common Tapping Cycle (G84) /Side Common Tapping Cycle (G88)
When G84/G88 executes the common tapping, the miscellaneous function controls the
spindle start/stop: M03(spindle CW), M04(spindle CCW) and M05 (spindle stop); the CNC checks
the spindle rotation based to the spindle encode and the tapping axis rotates along with the
spindle. When the machine cannot use the rigid tapping function, the common tapping mode
provides an economical tapping method.
The spindle must use the flexible chuck or the tool uses the variable screw tap in the common
tapping mode.
Command function: when the spindle rotates one rotation, Z axis moves one pitch, which
keeps consistent with the pitch of screw tap and forms one helical grooving in
inner of the workpiece to complete the thread machining of inner hole one time.
Pay more attention to the difference between it and the spindle rigid tapping.
Command format
：
G84 X (U)_ C (H)_ Z (W)_ R_ P_ F_ K_ M_ ; or
G88 Z (W)_ C (H)_ X (U)_ R_ P_ F_ K_ M_ ;
Command explanation ：
X_ C_ or Z_ C_ It is the hole position data and is valid only in the specified block; the
hole position data can specify other valid axes except for X, Z, C.
Z(W)_ or X(U)_ It specifies the coordinate value of hole bottom by using absolute
coordinate, or specifies the distance from R level to the hole bottom
by using incremental value, and it is valid in the specified block.
R_ It is the distance from the initial level to point R and is specified by
radius value with direction. Its unit and range is shown below.
P_ Hole bottom pause time. Unit of ISB system is 1ms and ISC is 0.1ms.
F_ Cutting feedrate ，
K_ Execution times of program
（
it is used when it is needed
）
.
M_ M command for clamping C axis
（
it is used when it is needed
）
.
Tapping feed axis specifies X or Z axis according to G84/G88. G84 specifies Z to be the
tapping axis and G88 specifies X. The spindle is selected according to relevant G signals (it is
related to PLC programs).
Cutting feedrate F (i.e. feedrate of tapping axis) and spindle speed S confirm the thread
+ Incremental
system
Metric input
（
mm
）
inch input (inch)
ISB system
-99999.999
～
99999.999mm -9999.9999
～
9999.9999 inch
R
ISC system
-9999.9999
～
9999.9999 mm -999.99999
～
999.99999 inch