Cycle Parameters - HEIDENHAIN TNC 620 User Manual

BACK BORING (Cycle 204, DIN/ISO: G204, software option 19)

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
counterbore floor. 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 countersinking Q254: Traversing
speed of the tool in mm/min during countersinking.
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
reference axis
2: Retract the tool in minus direction of the minor
axis
3: Retract the tool in plus direction of the reference
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
TNC 620 | User's Manual Cycle Programming | 3/2014
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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