HEIDENHAIN MANUALplus 620 297
4.22 Drilling and Boring Cycles
Retraction length J: Use this parameter for floating tap holders. The
cycle calculates a new nominal pitch on the basis of the thread depth,
the programmed pitch, and the “retraction length.” The nominal pitch
is somewhat smaller than the pitch of the tap. During tapping, the tap
is pulled away from the chuck by the retraction length. With this
method you can achieve higher service life from the taps.
Parameter combinations for single holes without contour
description
XS, XE ZS, ZE
XS, K ZS, K
XE, K ZE, K
Hole pattern: NS refers to the hole contour, and not the
definition of the pattern.
Single hole without contour description: Program XS or
ZS as alternative.
Hole with contour description: Do not program XS, ZS.
Cycle stop interrupts the tapping operation.
Cycle start resumes the tapping operation.
Use the feed rate override function for speed changes.
Spindle override is not effective.
Use a floating tap holder if the driven tool is not
controlled, e.g. by a ROD encoder.
Cycle run
1 Moves at rapid traverse to the starting point:
RB not programmed: Moves directly to the starting point
RB programmed: Moves to the position RB and then to the
starting point
2 Moves along run-in length B feed rate (synchronization of spindle
and feed drives).
3 Cuts the thread.
4 Retracts with return speed S:
RB not programmed: To the starting point
RB programmed: To the position RB
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