HELICAL THREAD DRILLING/MILLING (Cycle 265, DIN/ISO: G265) 4.9
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HEIDENHAIN | TNC 320 | User’s manual for cycle programming | 9/2016
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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 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.
If you change the thread depth, the TNC
automatically changes the starting point for the
helical movement.
The type of milling (up-cut/climb) is determined by
the thread (right-hand/left-hand) and the direction of
tool rotation, since it is only possible to work in the
direction of the tool.
Danger of collision!
Enter in machine parameter displayDepthErr
whether the TNC should output an error message
(on) or not (off) if a positive depth is entered.
Keep in mind that the TNC reverses the calculation
for pre-positioning when a positive depth is
entered. This means that the tool moves at rapid
traverse in the tool axis to set-up clearance below
the workpiece surface!
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