HEIDENHAIN TNC 426 (280 476) - Manual (Page 279)

252 8 Programming: Cycles
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
7 7 7 7 Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface
7 7 7 7 Depth at front Q358 (incremental value): Distance
between tool point and the top surface of the
workpiece for countersinking at the front of the tool
7 7 7 7 Countersinking offset at front Q359 (incremental
value): Distance by which the TNC moves the tool
center away from the stud center
7 7 7 7 Workpiece surface coordinate Q203 (absolute
value): Coordinate of the workpiece surface
7 7 7 7 2nd set-up clearance Q204 (incremental value):
Coordinate in the tool axis at which no collision
between tool and workpiece (clamping devices) can
occur.
7 7 7 7 Feed rate for counterboring Q254: Traversing
speed of the tool during counterboring in mm/min
7 7 7 7 Feed rate for milling Q207: Traversing speed of the
tool in mm/min while milling.
Example: NC blocks
25 CYCL DEF 267 OUTSIDE THREAD MLLNG
Q335=10 ;NOMINAL DIAMETER
Q239=+1.5 ;PITCH
Q201=-20 ;THREAD DEPTH
Q355=0 ;THREADS PER STEP
Q253=750 ;F PRE-POSITIONING
Q351=+1 ;CLIMB OR UP-CUT
Q200=2 ;SET-UP CLEARANCE
Q358=+0 ;DEPTH AT FRONT
Q359=+0 ;OFFSET AT FRONT
Q203=+30 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP CLEARANCE
Q254=150 ;F COUNTERSINKING
Q207=500 ;FEED RATE FOR MILLING