HEIDENHAIN TNC 640 (34059x-05) - Manual (Page 221)

Approaching and departing a contour 6.3
6
TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 1/2015
221
Departing on a circular path with tangential
connection:
DEP CT
The tool moves on a circular arc from the last contour point P
E
to
the end point P
N
. The circular arc connects tangentially to the last
contour element.
Program the last contour element with the end point P
E
and
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
opposite to the radius compensation:
Enter R as a negative value.
Example NC blocks
23 L Y+20 RR F100
Last contour element: PE with radius compensation
24 DEP CT CCA 180 R+8 F100
Center angle=180°, arc radius=8 mm
25 L Z+100 FMAX M2
Retract in Z, return to block 1, end program
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
E
to an auxiliary point P
H
. It then moves on a straight line to the
end point P
N
. The arc is tangentially connected both to the last
contour element and to the line from P
H
to P
N
. Once these lines
are known, the radius R suffices to unambiguously define the tool
path.
Program the last contour element with the end point P
E
and
radius compensation
Initiate the dialog with the
APPR/DEP key and DEP LCT soft key:
Enter the coordinates of the end point P
N
Radius R of the circular arc. Enter R as a positive
value
Example NC blocks
23 L Y+20 RR F100 Last contour element: PE with radius compensation
24 DEP LCT X+10 Y+12 R+8 F100
Coordinates PN, arc radius=8 mm
25 L Z+100 FMAX M2
Retract in Z, return to block 1, end program