Cycle parameters – HEIDENHAIN TNC 128 (77184x-02) User Manual
Page 409
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BACK BORING (Cycle 204) 16.7
16
TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
409
Cycle parameters
Set-up clearance Q200 (incremental): Distance
between tool tip and workpiece surface. Input range
0 to 99999.9999
Depth of counterbore Q249 (incremental):
Distance between underside of workpiece and the
top of the hole. A positive sign means the hole will
be bored in the positive spindle axis direction. Input
range -99999.9999 to 99999.9999
Material thickness Q250 (incremental): Thickness
of the workpiece. Input range 0.0001 to 99999.9999
Off-center distance Q251 (incremental): Off-center
distance for the boring bar; value from tool data
sheet. Input range 0.0001 to 99999.9999
Tool edge height Q252 (incremental): Distance
between the underside of the boring bar and the
main cutting tooth; value from tool data sheet. Input
range 0.0001 to 99999.9999
Feed rate for pre-positioning Q253: Traversing
speed of the tool in mm/min when plunging into the
workpiece, or when retracting from the workpiece.
Input range 0 to 99999.999; alternatively
FMAX,
FAUTO
Feed rate for back boring Q254: Traversing speed
of the tool during back boring in mm/min. Input
range 0 to 99999.999; alternatively
FAUTO, FU
Dwell time Q255: Dwell time in seconds at the top
of the bore hole. Input range 0 to 3600.000
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
Disengaging direction (1/2/3/4) Q214: Determine
the direction in which the TNC displaces the tool by
the off-center distance (after spindle orientation);
programming 0 is not allowed
1
: Retract the tool in minus direction of the principle
axis
2
: Retract the tool in minus direction of the minor
axis
3
: Retract the tool in plus direction of the principle
axis
4
: Retract the tool in plus direction of the minor axis
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
NC blocks
11 CYCL DEF 204 BACK BORING
Q200=2
;SET-UP 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 COUNTERBORING
Q255=0
;DWELL TIME
Q203=+20
;SURFACE COORDINATE
Q204=50
;2ND SET-UP
CLEARANCE
Q214=1
;DISENGAGING DIRECTN
Q336=0
;ANGLE OF SPINDLE
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