HEIDENHAIN TNC 426 (280 476) - Manual (Page 265)

238 8 Programming: Cycles
8.3 Cy
cles f
o
r Dr
illing, T
a
pping and Thr
ead Milling
7 7 7 7 Feed rate for pre-positioning Q253: Traversing
speed of the tool when moving in and out of the
workpiece, in mm/min
7 7 7 7 Climb or up-cut Q351: Type of milling operation with
M03
+1 = climb milling
–1 = up-cut milling
7 7 7 7 Set-up clearance Q200 (incremental value): Distance
between tool tip and workpiece surface
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 milling Q207: Traversing speed of the
tool in mm/min while milling.
Example: NC blocks
25 CYCL DEF 262 THREAD MILLING
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
Q203=+30 ;SURFACE COORDINATE
Q204=50 ;2ND SET-UP CLEARANCE
Q207=500 ;FEED RATE FOR MILLING