HEIDENHAIN ITNC 530 - CONVERSATIONAL PROGRAMMING User Manual page 214

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 effective
for the entire path that the TNC traversed in the approach block (path
P to P ).
S A
If you have programmed the coordinates of all three principal axes X,
Y and Z in the approach block, the TNC moves the tool from the
position defined before the APPR block simultaneously in all three
axes to the auxiliary point P
H
P to P .
H A
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.
U Use any path function to approach the starting point P
U Initiate the dialog with the APPR/DEP key and APPR LCT soft key:
U Coordinates of the first contour point P
U Radius R of the circular arc. Enter R as a positive value
U Radius compensation RR/RL for machining
Example NC blocks
7 L X+10 Y+10 R0 FMAX M3
8 APPR LCT X+10 Y+20 Z-10 R10 RR F100
9 L X+20 Y+35
10 L ...
214
and then, only in the working plane, from
–P as well as to
S H
S
A
to an
S
on a
A
Approach P without radius compensation
S
P with radius comp. RR, radius R=10
A
End point of the first contour element
Next contour element
Programming: Programming Contours