HEIDENHAIN TNC 370 User Manual page 104

5 Programming Tool Movements
5.2 Contour Approach and Departure
End position
The end position, like the starting point, must be
l
approachable without collision
l
near the last contour point
l
located to prevent contour damage during workpiece departure
The best end position @ lies on the extension of the tool path. The end
position can be located anywhere outside of the hatch marked area. It is
approached without radius compensation.
Departing the end position in the spindle axis
The spindle axis is moved separately when the end position is departed.
Example: L X Y RO
approaching the end position
L z+50 retracting the tool
Fig. 5.7: End position @ after machining
Common starting and end position
A common starting and end position @ can be located outside of the
hatch marked area in the figures.
The best common starting and end position lies exactly between the
extensions of the tool paths for machining the first and last contour
elements.
A common starting and end position is approached without radius com-
pensation.
Fig. 5.8:
Retract separately in the spindle
axis
Fig. 5.9:
Common starting and end position
TNC 370 5-5