Please Note While Programming - HEIDENHAIN TNC 640 User Manual

4
Fixed Cycles: Tapping / Thread Milling | OUTSIDE THREAD MILLING (Cycle 267, DIN/ISO: G267)

Please note while programming:

Program a positioning block for the starting point (stud
center) in the working plane with radius compensation
R0.
The offset required before countersinking at the front
should be determined ahead of time. You must enter
the value from the center of the stud to the center of
the tool (uncorrected value).
The algebraic sign of the cycle parameters depth
of thread or sinking depth at front determines the
working direction. The working direction is defined in
the following sequence:
1. Thread depth
2. Depth at front
If you program a depth parameter to be 0, the TNC does
not execute that step.
The algebraic sign for the cycle parameter "thread depth"
determines the working direction.
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
152
NOTICE
HEIDENHAIN | User's manual for cycle programming | 10/2017