Please Note While Programming - HEIDENHAIN TNC 640 User Manual

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Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling | POLYGON STUD (Cycle 258, DIN/ISO: G258)

Please note while programming:

Before the start of the cycle you will have to preposition
the tool on the machining plane. In order to do so, move
the tool with radius compensation R0 to the center of
the stud.
The TNC automatically pre-positions the tool in the tool
axis. Observe Q204 2ND SET-UP CLEARANCE.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
The TNC reduces the infeed depth to the LCUTS tool
length defined in the tool table if the tool length is
shorter than the Q202 infeed depth programmed in the
cycle.
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
190
NOTICE
HEIDENHAIN | User's manual for cycle programming | 10/2017