HEIDENHAIN TNC 620 User Manual page 250

6
Programming contours
6.3 Approaching and departing a contour
Departing in a straight line with tangential
connection: DEP LT
The tool moves on a straight line from the last contour point P
the end point P . The line lies on the extension of the last contour
N
element. P is separated from P
N
Program the last contour element with the end point P
radius compensation
Initiate the dialog with the APPR DEP key and DEP LT soft key
LEN: Enter the distance from the last contour
element P
Example NC blocks
N20 G01 Y+20 G42 F100*
N30 DEP LT LEN12.5 F100*
N40 G00 Z+100 M2*
Departing in a straight line perpendicular to the last
contour point: DEP LN
The tool moves on a straight line from the last contour point P
the end point P . The line departs on a perpendicular path from the
N
last contour point P
plus the tool radius.
Program the last contour element with the end point P
radius compensation
Initiate the dialog with the APPR DEP key and DEP LN soft key
LEN: Enter the distance from the last contour
element to P
LEN
Example NC blocks
N20 G01 Y+20 G42 F100*
N30 DEP LN LEN+20 F100*
N40 G00 Z+100 M2*
250
by the distance LEN.
E
to the end point P
E
. P is separated from P
E N E
. Important: Enter a positive value in
N
to
E
and
E
.
N
Last contour element: PE with radius compensation
Depart contour by LEN=12.5 mm
Retract in Z, return to block 1, end program
to
E
by the distance LEN
and
E
Last contour element: PE with radius compensation
Depart perpendicular to contour by LEN=20 mm
Retract in Z, return to block 1, end program
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
R0=G40; RL=G41; RR=G42
R0=G40; RL=G41; RR=G42