HEIDENHAIN TNC 640 (34059x-02) - Manual (Page 205)

Approaching and departing a contour 6.3
6
TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
205
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 of the radius compensation (i.e. to the
right with RR or to the left with RL): 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