HEIDENHAIN TNC 620 Programming Station, Руководство пользователя

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Programming contours
6.3 Approaching and departing a contour
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HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
Approaching on a circular path with tangential
connection:
APPR CT
The tool moves on a straight line from the starting point P
S
to an
auxiliary point P
H
. It then moves from PH to the first contour point
PA following a circular arc that is tangential to the first contour
element.
The arc from P
H
to P
A
is determined through the radius R and
the center angle
CCA
. The direction of rotation of the circular arc
is automatically derived from the tool path for the first contour
element.
Use any path function to approach the starting point P
S
.
Initiate the dialog with the
APPR DEP
key and
APPR CT
soft key
Coordinates of the first contour point P
A
Radius R of the circular arc
If the tool should approach the workpiece in the
direction defined by the radius compensation:
Enter R as a positive value
If the tool should approach the workpiece
opposite to the radius compensation: Enter R
as a negative value.
Center angle
CCA
of the arc
CCA can be entered only as a positive value.
Maximum input value 360°
Radius compensation
G41/G42
for machining
R0=G40; RL=G41; RR=G42
Example NC blocks
N70 G00 X+40 Y+10 G40 M3*
Approach PS without radius compensation
N80 APPR CT X+10 Y+20 Z-10 CCA180 R+10 G42 F100*
PA with radius comp. G42, radius R=10
N90 G01 X+20 Y+35*
End point of the first contour element
N100 G01 ...*
Next contour element