HEIDENHAIN TNC 320 (77185x-01) Cycle programming - Manual (Page 122)

Fixed Cycles: Tapping / Thread Milling
4.10 OUTSIDE THREAD MILLING (Cycle 267, DIN/ISO: G267)
4
122
TNC 320 | User's Manual Cycle Programming | 3/2014
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!
Use the machine parameter displayDepthErr to
define whether, if a positive depth is entered, the
TNC should output an error message (on) or not (off).
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!