Please Note While Programming - HEIDENHAIN TNC 640 User Manual

Fixed Cycles: Tapping / Thread Milling | THREAD MILLING (Cycle 262, DIN/ISO: G262)

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 for the cycle parameter "thread depth"
determines the working direction.
If you program the thread DEPTH = 0, the cycle will not
be executed.
The nominal thread diameter is approached in a semi-
circle from the center. A pre-positioning movement to
the side is carried out if the pitch of the tool diameter is
four times smaller than the nominal thread diameter.
Note that the TNC makes a compensation movement in
the tool axis before the approach movement. The length
of the compensation movement is at most half of the
thread pitch. Ensure sufficient space in the hole!
If you change the thread depth, the TNC automatically
changes the starting point for the helical movement.
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
HEIDENHAIN | User's manual for cycle programming | 10/2017
NOTICE
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