HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 428)

Cycles: Turning
12.31 GEAR HOBBING (Cycle 880, DIN/ISO: G880)
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428
TNC 640 | User's Manual Cycle Programming | 1/2015
Feed rate for pre-positioning Q253: Traversing
speed of the tool when tilting and pre-positioning,
and when positioning the tool axis between the
individual infeeds. Entry in mm/min. Input range 0 to
99999.9999 alternatively
FMAX, FAUTO, PREDEF
Clearance height Q260 (absolute): Coordinate in
the tool axis at which no collision between tool
and workpiece (fixtures) can occur. Default value:
PREDEF , input range -99999.9999 to 99999.9999
Tool length offset Q553: Define which section of
the gear hob is to be used. As gear hobbing causes
wear to the hob teeth, the tool can be offset in the
longitudinal direction to evenly apply the load over
the entire length of the tool. In parameter Q553 you
enter an incremental distance by which the tool is to
be moved in the longitudinal direction. Input range 0
to 99.9999
Starting point in Z Q551: Starting point in Z for gear
hobbing. Input range -99999.9999 to 99999.9999
End point in Z Q552: End point in Z for gear
hobbing. Input range -99999.9999 to 99999.9999
Maximum cutting depth Q463: Maximum infeed
(radius value) in radial direction. The infeed is divided
evenly to avoid abrasive cuts. Input range 0.001 to
999.999
Set-up clearance Q460 (incremental): Distance
for retraction and pre-positioning.Input range 0 to
999.999
Feed rate for plunging Q488: Feed rate for tool
infeed. Input range 0 to 99999.999
Roughing feed rate Q478: Feed rate during
roughing. If M136 has been programmed, the
value is interpreted by the TNC in millimeters per
revolution, without M136 in millimeters per minute.
Oversize in diameter Q483 (incremental): Diameter
oversize for the defined contour .
Finishing feed rate Q505: Feed rate during
finishing. If M136 has been programmed, the
value is interpreted by the TNC in millimeters per
revolution, without M136 in millimeters per minute.