Approaching On A Circular Path With Tangential Connection From A Straight Line To The Contour: Appr Lct - HEIDENHAIN TNC 640 User Manual

Programming Contours | Approaching and departing a contour
Approaching on a circular path with tangential
connection from a straight line to the contour:
APPR LCT
The tool moves on a straight line from the starting point P
an auxiliary point P . It then moves to the first contour point P
H
on a circular arc. The feed rate programmed in the APPR block
is effective for the entire path that the control traversed in the
approach block (path P to P
S
If you have programmed the coordinates of all three principal axes
X, Y and Z in the approach block, the control moves the tool from
the position defined before the APPR block to the auxiliary point P
on all three axes simultaneously. Then the connect goes from P
P only on the working plane.
A
The arc is connected tangentially both to the line P
as 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 circular arc. Enter R as a positive
value
Radius compensation G41/G42 for machining
Example
N70 G00 X+40 Y+10 G40 M3*
N80 APPR LCT X+10 Y+20 Z-10 R10 G42 F100*
N90 G01 X+20 Y+35*
N100 G01 ...*
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017
).
A
- P
S
to
S
A
H
to
H
as well
H
.
S
A
Approach PS without radius compensation
PA with radius comp. G42, radius R=10
End point of the first contour element
Next contour element
7
R0=G40; RL=G41; RR=G42
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