HEIDENHAIN TNC 640 User Manual page 457

Cycles: Turning | AXIAL RECESSING EXTENDED
(Cycle 872, DIN/ISO: G872)
Q484 Oversize in Z? (incremental): Oversize for
the defined contour in axial direction
Q505 Finishing feed rate?: Feed rate for
finishing. If M136 has been programmed, the
value is interpreted by the TNC in millimeters
per revolution, without M136 in millimeters per
minute.
Q463 Limit to plunging depth?: Max. recess
depth per cut
Q510 Overlap factor for recess width? The
factor Q510 influences the stepover of the tool
when roughing. Q510 is multiplied by the width
CUTWIDTH of the tool. This results in the stepover
factor "k". Input range 0.001 to 1
Q511 Feed rate factor in %? Factor Q511
influences the feed rate for full recessing, i.e.
when a recess is cut with the entire tool width
CUTWIDTH. If you use this feed rate factor,
optimum cutting conditions can be created during
the remaining roughing process. That way you
can define the roughing feed rate Q478 so high
that it permits optimum cutting conditions for
each overlap of the cutting width (Q510). The TNC
thus reduces the feed rate by the factor Q511
only when recessing with full contact. In total this
can lead to reduced machining times. Input range
0.001 to 150
Q462 Retraction behavior (0/1)? Q462 defines
the retraction behavior after recessing.
0: The TNC retracts the tool along the contour
1: The TNC first moves the tool away from the
contour diagonally and then retracts it
Q211 Dwell time / 1/min? A dwell time can be
specified in revolutions of the tool spindle, which
retards the retraction after the recessing on the
floor. Retraction is only performed after the tool
has remained for Q211 revolutions. Input range 0
to 999.999
HEIDENHAIN | User's manual for cycle programming | 10/2017
Q463=+0 ;LIMIT TO DEPTH
Q510=+0.08;RECESSING OVERLAP
Q511=+100 ;FEED RATE FACTOR
Q462=0 ;RETRACTION MODE
Q211=3 ;DWELL TIME IN REVS
12 L X+75 Y+0 Z+2 FMAX M303
13 CYCL CALL
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