HEIDENHAIN TNC 620 User Manual page 157

CIRCULAR STUD (Cycle 257, DIN/ISO: G257, software option 19)
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; alternatively PREDEF
Path overlap factor Q370: Q370 x tool radius
= stepover factor k. Input range: 0.1 to 1.414;
alternatively PREDEF
Starting angle Q376: Polar angle relative to the stud
center from which the tool approaches the stud.
Input range 0 to 359°
TNC 620 | User's Manual Cycle Programming | 3/2014
NC blocks
8 CYCL DEF 257 CIRCULAR STUD
Q223=60 ;FINISHED PART
DIAMETER
Q222=60 ;WORKPIECE BLANK
DIAMETER
Q368=0.2 ;ALLOWANCE FOR SIDE
Q207=500 ;FEED RATE FOR
MILLING
Q351=+1 ;CLIMB OR UP-CUT
Q201=-20 ;DEPTH
Q202=5 ;PLUNGING DEPTH
Q206=150 ;FEED RATE FOR
PLNGNG
Q200=2 ;SET-UP CLEARANCE
Q203=+0 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP
CLEARANCE
Q370=1 ;TOOL PATH OVERLAP
Q376=0 ;STARTING ANGLE
9 L X+50 Y+50 R0 FMAX M3 M99
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