HEIDENHAIN TNC 620 Programming Station

Programming contours | Approaching and departing a contour
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
23 L Y+20 RR F100
Last contour element P
E
with radius compensation RR
24 DEP CT CCA 180 R+8 F100
Center angle CCA 180°, radius of the circular path R8
25 L Z+100 FMAX M2
Retract in Z, return jump, 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
S
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
23 L Y+20 RR F100
Last contour element P
E
with radius compensation RR
24 DEP LCT X+10 Y+12 R+8 F100
Coordinates P
N
, radius of the circular path R8
25 L Z+100 FMAX M2
Retract in Z, return jump, end program
5
HEIDENHAIN | TNC620 | Klartext Programming User's Manual | 01/2022
153