HEIDENHAIN ITNC 530 User Manual page 210

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