HEIDENHAIN ITNC 530 User Manual page 345

11 At the end of the cycle, the TNC retracts the tool in rapid traverse
to set-up clearance or, if programmed, to the 2nd set-up clearance
Before programming, note the following:
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. Depth of thread
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.
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.
Danger of collision!
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
at safety clearance below the workpiece surface!
HEIDENHAIN iTNC 530 345