HEIDENHAIN TNC 426 B, User Manual

Page: 116 / 362

100
6 Programming: Programming Contours
Departing tangentially on a straight line: DEP LT
The TNC move the tool on a straight line from the last contour point P
E
to the end point P
N
. The line lies in the extension of the last contour
element. P
N
is located at the distance LEN from P
E
.
ú
Program the last contour element with the end point P
E
and
radius compensation.
ú
Initiate the dialog with the APPR/DEP key and DEP LT soft key:
ú
LEN: Enter the distance from the last contour element
P
E
to the end point P
N
.
Example NC blocks
23 L Y+20 RR F100
24 DEP LT LEN 12.5 F100
25 L Z+100 FMAX M2
Departing on a straight line perpendicular to the
last contour point: DEP LN
The tool moves on a straight line from the last contour point P
E
to
the end point P
N
. The line departs on a perpendicular path from the
last contour point P
E
. P
N
is separated from P
E
by the distance LEN
plus the tool radius.
ú
Program the last contour element with the end point P
E
and
radius compensation.
ú
Initiate the dialog with the APPR/DEP key and DEP LN soft key:
ú
LEN: Enter the distance from the last contour element
P
E
to the end point P
N
.
Important: Always enter LEN as a positive value!
Example NC blocks
23 L Y+20 RR F100
24 DEP LN LEN+20 F100
25 L Z+100 FMAX M2
Last contour element: P
E
with radius compensation
Depart contour by LEN = 12.5 mm
Retract in Z, return to block 1, end program
Last contour element: P
E
with radius compensation
Depart perpendicular to contour by LEN = 20 mm
Retract in Z, return to block 1, end program
X
Y
20
P
E
RR
P
N
R0
RR
12.5
X
Y
20
P
E
RR
P
N
R0
RR
20
6.3 Cont
our
Appr
oac
h and Depar
tu
re
Gkap6.pm6 30.06.2006, 07:04 100
www.EngineeringBooksPdf.com