Departing On A Circular Path With Tangential Connection: Dep Ct; Departing On A Circular Arc Tangentially Connecting The Contour And A Straight Line: Dep Lct - HEIDENHAIN TNC 620 User Manual

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
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
compensation: Enter R as a negative value.
Example
23 L Y+20 RR F100
24 DEP CT CCA 180 R+8 F100
25 L Z+100 FMAX 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
an auxiliary point P . It then moves on a straight line to the end
H
point P . The arc is tangentially connected both to the last contour
N
element and to the line from P
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
23 L Y+20 RR F100
24 DEP LCT X+10 Y+12 R+8 F100
25 L Z+100 FMAX M2
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2017
opposite to the radius
to P . Once these lines are known,
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
to
S
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
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