90 Fixed Cycles: Drilling
3.7 BACK BORING (Cycle 204, DIN/ISO: G204)
U Workpiece surface coordinate Q203 (absolute):
Coordinate of the workpiece surface. Input range
-99999.9999 to 99999.9999, alternatively PREDEF
U 2nd setup 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
U Disengaging direction (0/1/2/3/4) Q214:
Determine the direction in which the TNC displaces
the tool by the off-center distance (after spindle
orientation). Input of 0 is not permitted.
U Angle for spindle orientation Q336 (absolute):
Angle at which the TNC positions the tool before it is
plunged into or retracted from the bore hole. Input
range -360.0000 to 360.0000
Example: NC blocks
11 CYCL DEF 204 BACK BORING
Q200=2 ;SETUP CLEARANCE
Q249=+5 ;DEPTH OF COUNTERBORE
Q250=20 ;MATERIAL THICKNESS
Q251=3.5 ;OFF-CENTER DISTANCE
Q252=15 ;TOOL EDGE HEIGHT
Q253=750 ;F PRE-POSITIONING
Q254=200 ;F COUNTERSINKING
Q255=0 ;DWELL TIME
Q203=+20 ;SURFACE COORDINATE
Q204=50 ;2ND SETUP CLEARANCE
Q214=1 ;DISENGAGING DIRECTN
Q336=0 ;ANGLE OF SPINDLE
1 Retract tool in the negative ref. axis direction.
2 Retract tool in the negative minor axis direction.
3 Retract tool in the positive ref. axis direction.
4 Retract tool in the positive minor axis direction.
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