HEIDENHAIN TNC 620 User Manual page 123

THREAD DRILLING/MILLING (Cycle 264, DIN/ISO: G264)
Upper advanced stop distance Q258 (incremental):
Set-up clearance for rapid traverse positioning
when the TNC moves the tool again to the current
plunging depth after retraction from the hole. 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
(incremental): Value by which the TNC retracts
the tool during chip breaking. Input range 0.000 to
99999.999
Depth at front Q358 (incremental): Distance
between tool tip and the top surface of the
workpiece for countersinking at front. Input range
-99999.9999 to 99999.9999
Countersinking offset at front Q359 (incremental):
Distance by which the TNC moves the tool center
away from the hole center. Input range 0 to
99999.9999
Set-up clearance Q200 (incremental): Distance
between tool tip and workpiece surface. Input range
0 to 99999.9999
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
Feed rate for plunging Q206: Traversing speed
of the tool when moving into the workpiece in
mm/min. Input range 0 to 99999.999 alternatively
FAUTO, FU
Feed rate for milling Q207: Traversing speed of
the tool in mm/min while milling. Input range 0 to
99999.999 alternatively FAUTO
Feed rate for approaching Q206: Traversing
speed of the tool in mm/min while approaching.
If the thread diameters are small, you can reduce
the danger of tool breakage by using a reduced
approaching feed rate. Input range 0 to 99999.999
alternatively FAUTO
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 9/2015
NC blocks
25 CYCL DEF 264 THREAD DRILLNG/
MLLNG
Q335=10 ;NOMINAL DIAMETER
Q239=+1.5 ;THREAD PITCH
Q201=-16 ;THREAD DEPTH
Q356=-20 ;TOTAL HOLE DEPTH
Q253=750 ;F PRE-POSITIONING
Q351=+1 ;CLIMB OR UP-CUT
Q202=5 ;PLUNGING DEPTH
Q258=0.2 ;ADV. STOP DIST.
Q257=5 ;DEPTH FOR CHIP
BRKNG
Q256=0.2 ;DIST. FOR CHIP BRKNG
Q358=+0 ;DEPTH AT FRONT
Q359=+0 ;OFFSET AT FRONT
Q200=2 ;SET-UP CLEARANCE
Q203=+30 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP
CLEARANCE
Q206=150 ;FEED RATE FOR
PLNGNG
Q207=500 ;FEED RATE FOR
MILLING
Q512=0 ;FEED RATE FOR
APPROACHING
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