BACK BORING (Cycle 204, DIN/ISO: G204) 3.7
3
HEIDENHAIN | TNC 320 | User’s manual for cycle programming | 9/2016
79
Cycle parameters
Q200 Set-up clearance? (incremental): Distance
between tool tip and workpiece surface Input range
0 to 99999.9999
Q249 Depth of counterbore? (incremental):
Distance between underside of workpiece and the
top of hole. A positive sign means the hole will be
bored in the positive spindle axis direction. Input
range -99999.9999 to 99999.9999
Q250 Material thickness? (incremental): Thickness
of the workpiece Input range 0.0001 to 99999.9999
Q251 Tool edge off-center distance? (incremental):
Off-center distance for the boring bar; value
from the tool data sheet Input range 0.0001 to
99999.9999
Q252 Tool edge height? (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
Q253 Feed rate for pre-positioning?: Traversing
speed of the tool in mm/min when plunging into the
workpiece, or when retracting from the workpiece.
Input range 0 to 99999.9999 alternatively FMAX,
FAUTO
Q254 Feed rate for counterboring?: Traversing
speed of the tool in mm/min during countersinking.
Input range 0 to 99999.9999 alternatively FAUTO,
FU
Q255 Dwell time in secs.?: Dwell time in seconds
at the top of the bore hole. Input range 0 to
3600.000
Q203 Workpiece surface coordinate? (absolute):
Coordinate of the workpiece surface. Input range
-99999.9999 to 99999.9999
Q204 2nd set-up clearance? (incremental):
Coordinate in the spindle axis at which no collision
between tool and workpiece (fixtures) can occur.
Input range 0 to 99999.9999
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
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