Please Note While Programming - HEIDENHAIN TNC 640 User Manual

4
Fixed Cycles: Tapping / Thread Milling | THREAD DRILLING/MILLING (Cycle 264, DIN/ISO: G264)

Please note while programming:

Program a positioning block for the starting point (hole
center) in the working plane with radius compensation
R0.
The algebraic sign of the cycle parameters depth of
thread, countersinking depth or sinking depth at front
determines the working direction. The working direction
is defined in the following sequence:
1. Thread depth
2. Countersinking depth
3. Depth at front
If you program a depth parameter to be 0, the TNC does
not execute that step.
Program the thread depth as a value smaller than the
total hole depth by at least one-third the thread pitch.
Danger of collision!
If you enter a positive depth with a cycle, the TNC reverses
calculation of the pre-positioning. This means that the tool
moves at rapid traverse in the tool axis to set-up clearance
below the workpiece surface!
Enter depth as negative
Enter in machine parameter displayDepthErr (No. 201003)
whether the TNC should output an error message (on) or not
(off) if a positive depth is entered
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NOTICE
HEIDENHAIN | User's manual for cycle programming | 10/2017