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Example NC blocks
7
X+40 Y+10 R0 FMAX M3
8 APPR CT X+10 Y+20 Z-10 CCA180 R+10 RR F100
9
X+20 Y+35
10
...
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 from P
H
on a circular arc.
The arc is connected tangentially both to the line P
to 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 arc
Always enter R as a positive value.
Radius compensation for machining
Example NC blocks
7
X+40 Y+10 R0 FMAX M3
8 APPR
CT X+10 Y+20 Z-10 R10 RR F100
9
X+20 Y+35
10
...
HEIDENHAIN TNC 426 B, TNC 430
www.EngineeringBooksPdf.com
to an
S
to the first contour point P
H
– P
as well as
S
H
.
S
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
Y
35
P
A
A
20
RR
10
10
Approach P
without radius compensation
S
P
with radius compensation RR, radius R=10
A
End point of the first contour element
Next contour element
P
S
R0
P
H
RR
X
20
40
99
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