HEIDENHAIN iTNC 530 (34049x-08) Cycle programming - Manual (Page 137)

HEIDENHAIN iTNC 530 137
4.1
0 OUTSIDE THREAD MILLING (Cy
cle 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:
1st: Depth of thread
2nd: 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!
Enter in MP7441 bit 2 whether the TNC should output an
error message (bit 2=1) or not (bit 2=0) 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!
Keep in mind that if the depth is changed, the TNC adjust
the starting angle so that the tool reaches the defined
depth at the 0° position of the spindle. In such cases,
recutting the thread may result in a second thread groove.