HEIDENHAIN TNC 426 B User Manual page 232

Before programming, note the following:
From the current position, the TNC positions the tool in a
linear 3-D movement to the starting point
the tool in such a way that no collision between tool and
clamping devices can occur.
The TNC moves the tool with radius compensation R0 to
the programmed positions.
If required, use a center-cut end mill (ISO 1641).
Starting point in 1st axis Q225 (absolute value):
Starting point coordinate of the surface to be
multipass-milled in the main axis of the working plane
Starting point in 2nd axis Q226 (absolute value):
Starting point coordinate of the surface to be
multipass-milled in the secondary axis of the working
plane
Starting point in 3rd axis Q227 (absolute value):
Starting point coordinate of the surface to be
multipass-milled in the tool axis
2nd point in 1st axis Q228 (absolute value): Stopping
point coordinate of the surface to be multipass milled
in the main axis of the working plane
2nd point in 2nd axis Q229 (absolute value): Stopping
point coordinate of the surface to be multipass milled
in the secondary axis of the working plane
2nd point in 3rd axis Q230 (absolute value): Stopping
point coordinate of the surface to be multipass milled
in the tool axis
3rd point in 1st axis Q231 (absolute value): Coordinate
of point in the main axis of the working plane
3rd point in 2nd axis Q232 (absolute value):
Coordinate of point
working plane
3rd point in 3rd axis Q233 (absolute value): Coordinate
of point in the tool axis
4th point in 1st axis Q234 (absolute value): Coordinate
of point in the main axis of the working plane
4th point in 2nd axis Q235 (absolute value):
Coordinate of point
working plane
4th point in 3rd axis Q236 (absolute value): Coordinate
of point in the tool axis
Number of cuts Q240: Number of passes to be made
between points
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.
HEIDENHAIN TNC 426 B, TNC 430
www.EngineeringBooksPdf.com
. Pre-position
in the subordinate axis of the
in the subordinate axis of the
and , and between points
Z
Q236
Q233
Q227
Q230
Q228
Y
Q235
Q232
Q229
Q226
Example NC blocks:
72 Y L DEF 231 RULED SURFA E
Q225=+0
Q226=+5
Q227=-2
Q228=+100
Q229=+15
Q230=+5
Q231=+15
Q232=+125
Q233=+25
Q234=+85
and
Q235=+95
Q236=+35
Q240=40
Q207=500
Q231 Q234 Q225
N = Q240
Q207
;STARTNG PNT 1ST AXIS
;STARTNG PNT 2ND AXIS
;STARTING PNT 3RD AXIS
;2ND POINT 1ST AXIS
;2ND POINT 2ND AXIS
;2ND PNT 3RD AXIS
;3RD POINT 1ST AXIS
;3RD PNT IN 2ND AXIS
;3RD PNT IN 3RD AXIS
;4TH PNT IN 1ST AXIS
;4TH PNT IN 2ND AXIS
;4TH PNT IN 3RD AXIS
;NUMBER OF UTS
;FEED RATE FOR MILLING
X
X
217