HEIDENHAIN TNC 640 User Manual page 288

7
With the APPR LT, APPR LN and APPR CT functions,
the control moves the tool to the auxiliary point P
at the last programmed feed rate (which can also be
FMAX). With the APPR LCT function, the control moves
to the auxiliary point P
with the APPR block. If no feed rate is programmed
yet before the approach block, the control generates an
error message.
Polar coordinates
You can also program the contour points for the following approach/
departure functions over polar coordinates:
APPR LT becomes APPR PLT
APPR LN becomes APPR PLN
APPR CT becomes APPR PCT
APPR LCT becomes APPR PLCT
DEP LCT becomes DEP PLCT
Select an approach or departure function with the soft key, then
press the orange P key.
Radius compensation
The tool radius compensation is programmed together with
the first contour point P
automatically discard the tool radius compensation.
If you program APPR LN or APPR CT with G40, the
control stops the machining/simulation with an error
message.
This method of function differs from the iTNC 530
control!
288
Programming Contours | Approaching and departing a contour
at the feed rate programmed
H
in the APPR block. The DEP blocks
A
H
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017