HEIDENHAIN TNC 620 User Manual page 251

Departing on a circular path with tangential
connection: DEP CT
The tool moves on a circular arc from the last contour point P
the end point P . The circular arc connects tangentially to the last
N
contour element.
Program the last contour element with the end point P
radius compensation
Initiate the dialog with the APPR DEP key and DEP CT soft key
Center angle CCA of the arc
Radius R of the circular arc
If the tool should depart the workpiece in the
direction opposite to the radius compensation:
Enter R as a positive value.
If the tool should depart the workpiece in the
direction
Enter R as a negative value.
Example NC blocks
N20 G01 Y+20 G42 F100*
N30 DEP CT CCA 180 R+8 F100*
N40 G00 Z+100 M2*
Departing on a circular arc tangentially connecting
the contour and a straight line: DEP LCT
The tool moves on a circular arc from the last contour point P
to an auxiliary point P . It then moves on a straight line to the
H
end point P . The arc is tangentially connected both to the last
N
contour element and to the line from P
are known, the radius R suffices to unambiguously define the tool
path.
Program the last contour element with the end point P
radius compensation
Initiate the dialog with the APPR/DEP key and DEP LCT soft key
Enter the coordinates of the end point P
Radius R of the circular arc. Enter R as a positive
value
Example NC blocks
N20 G01 Y+20 G42 F100*
N30 DEP LCT X+10 Y+12 R+8 F100*
N40 G00 Z+100 M2*
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
Approaching and departing a contour
opposite to the radius compensation:
to P . Once these lines
H N
to
E
and
E
Last contour element: PE with radius compensation
Center angle=180°, arc radius=8 mm
Retract in Z, return to block 1, end program
E
and
E
N
Last contour element: PE with radius compensation
Coordinates PN, arc radius=8 mm
Retract in Z, return to block 1, end program
6.3
R0=G40; RL=G41; RR=G42
R0=G40; RL=G41; RR=G42
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