Cycle Parameters - HEIDENHAIN TNC 640 User Manual

3

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 counterboring.
Input range 0 to 99999.9999 alternatively FAUTO,
fu
Q255 Dwell time in secs.?: Dwell time at
counterbore floor. 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
96
Fixed Cycles: Drilling | BACK BORING (Cycle 204, DIN/ISO: G204)
HEIDENHAIN | User's manual for cycle programming | 10/2017
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