HEIDENHAIN TNC 426 (280 476) - Manual (Page 343)

316 8 Programming: Cycles
8.7 Cy
cles f
o
r multipass milling
7 7 7 7 4th point in 1st axis Q234 (absolute value):
Coordinate of point 4 in the reference axis of the
working plane
7 7 7 7 4th point in 2nd axis Q235 (absolute value):
Coordinate of point 4 in the minor axis of the working
plane
7 7 7 7 4th point in 3rd axis Q236 (absolute value):
Coordinate of point 4 in the tool axis
7 7 7 7 Number of cuts Q240: Number of passes to be made
between points 1 and 4 , 2 and 3 .
7 7 7 7 Feed rate for milling Q207: Traversing speed of the
tool in mm/min while milling. The TNC performs the
first step at half the programmed feed rate.
Example: NC blocks
72 CYCL DEF 231 RULED SURFACE
Q225=+0 ;STARTNG PNT 1ST AXIS
Q226=+5 ;STARTNG PNT 2ND AXIS
Q227=-2 ;STARTING PNT 3RD AXIS
Q228=+100 ;2ND POINT 1ST AXIS
Q229=+15 ;2ND POINT 2ND AXIS
Q230=+5 ;2ND POINT 3RD AXIS
Q231=+15 ;3RD POINT 1ST AXIS
Q232=+125 ;3RD POINT 2ND AXIS
Q233=+25 ;3RD POINT 3RD AXIS
Q234=+15 ;4TH POINT 1ST AXIS
Q235=+125 ;4TH POINT 2ND AXIS
Q236=+25 ;4TH POINT 3RD AXIS
Q240=40 ;NUMBER OF CUTS
Q207=500 ;FEED RATE FOR MILLING