Cycle Parameters - HEIDENHAIN TNC 620 User Manual

TAPPING WITH CHIP BREAKING (Cycle 209, DIN/ISO: G209)

Cycle parameters

Set-up clearance Q200 (incremental): Distance
between tool tip and workpiece surface. Input range
0 to 99999.9999
Thread depth Q201 (incremental): Distance
between workpiece surface and root of thread.
Input range -99999.9999 to 99999.9999
Thread pitch Q239: Pitch of the thread. The
algebraic sign differentiates between right-hand and
left-hand threads:
+ = right-hand thread
–= left-hand thread
Input range -99.9999 to 99.9999
Coordinate of workpiece surface Q203 (absolute):
Coordinate of the workpiece surface. Input range
-99999.9999 to 99999.9999
2nd set-up clearance Q204 (incremental):
Coordinate in the spindle axis at which no collision
between tool and workpiece (fixtures) can occur.
Input range 0 to 99999.9999
Infeed depth for chip breaking Q257
(incremental): Depth at which the TNC carries out
chip breaking. No chip breaking if 0 is entered. Input
range 0 to 99999.9999
Retraction rate for chip breaking Q256: The
TNC multiplies the pitch Q239 by the programmed
value and retracts the tool by the calculated value
during chip breaking. If you enter Q256 = 0, the
TNC retracts the tool completely from the hole (to
the set-up clearance) for chip breaking. Input range
0.000 to 99999.999
Angle for spindle orientation Q336 (absolute):
Angle at which the TNC positions the tool before
machining the thread. This allows you to regroove
the thread, if required. Input range -360.0000 to
360.0000
RPM factor for retraction Q403: Factor by
which the TNC increases the spindle speed—
and therefore also the retraction feed rate—when
retracting from the drill hole. Input range 0.0001 to
10. Maximum increase to maximum speed of the
active gear range.
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015
NC blocks
26 CYCL DEF 209 TAPPING W/ CHIP
BRKG
Q200=2 ;SET-UP CLEARANCE
Q201=-20 ;DEPTH
Q239=+1 ;THREAD PITCH
Q203=+25 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP
CLEARANCE
Q257=5 ;DEPTH FOR CHIP
BRKNG
Q256=+1 ;DIST. FOR CHIP BRKNG
Q336=50 ;ANGLE OF SPINDLE
Q403=1.5 ;RPM FACTOR
4
4.4
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