HEIDENHAIN iTNC 530 (340 49x-02) - Manual (Page 210)

210 6 Programming: Programming Contours
6.3 Cont
our Appr
oac
h
and Depar
tur
e
Approaching on a circular arc with tangential
connection from a straight line to the contour:
APPR LCT
The tool moves on a straight line from the starting point P
S
to an
auxiliary point P
H
. It then moves to the first contour point P
A
on a
circular arc. The feed rate programmed in the APPR block is in effect.
The arc is connected tangentially both to the line P
S
– P
H
as well as to
the first contour element. Once these lines are known, the radius then
suffices to completely define the tool path.
8 Use any path function to approach the starting point P
S
.
8 Initiate the dialog with the APPR/DEP key and APPR LCT soft key:
8 Coordinates of the first contour point P
A
8 Radius R of the circular arc. Enter R as a positive value.
8 Radius compensation RR/RL for machining
Example NC blocks
X
Y
10
20
P
A
RR
P
S
R0
P
H
RR
RR
40 10
R10
35
20
7 L X+40 Y+10 RO FMAX M3 Approach P
S
without radius compensation
8 APPR LCT X+10 Y+20 Z-10 R10 RR F100 P
A
with radius comp. RR, radius R=10
9 L X+20 Y+35 End point of the first contour element
10 L ... Next contour element