Approaching On A Circular Path With Tangential Connection: Appr Ct - HEIDENHAIN TNC 620 User Manual

6
Programming: Programming Contours
6.3 Approaching and departing a contour
Approaching on a circular path with tangential
connection: APPR CT
The tool moves on a straight line from the starting point P
auxiliary point P . It then moves from PH to the first contour point
H
PA following a circular arc that is tangential to the first contour
element.
The arc from P to P
H
the center angle CCA. The direction of rotation of the circular arc
is automatically derived from the tool path for the first contour
element.
Use any path function to approach the starting point P
Initiate the dialog with the APPR/DEP key and APPR CT soft key
Coordinates of the first contour point P
Radius R of the circular arc
Center angle CCA of the arc
Radius compensation RR/RL for machining
Example NC blocks
7 L X+40 Y+10 R0 FMAX M3
8 APPR CT X+10 Y+20 Z-10 CCA180 R+10 RR F100
9 L X+20 Y+35
10 L ...
220
is determined through the radius R and
A
If the tool should approach the workpiece in the
direction defined by the radius compensation:
Enter R as a positive value
If the tool should approach the workpiece
opposite to the radius compensation: Enter R
as a negative value.
CCA can be entered only as a positive value.
Maximum input value 360°
to an
S
.
S
A
Approach PS without radius compensation
PA with radius compensation RR, radius R=10
End point of the first contour element
Next contour element
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015