Important Positions For Approach And Departure - HEIDENHAIN TNC 620 User Manual

Important positions for approach and departure

Starting point P
S
You program this position directly before the APPR block. P
lies outside the contour and is approached without radius
compensation (R0).
Auxiliary point P
H
Some of the paths for approach and departure go through an
auxiliary point P that the TNC calculates from your input in the
H
APPR or DEP block. The TNC moves from the current position
to the auxiliary point P
have programmed FMAX (positioning at rapid traverse) in the
last positioning block before the approach function, the TNC also
approaches the auxiliary point P
First contour point P and last contour point P
A
You program the first contour point P
The last contour point P
function. If the APPR block also contains a Z axis coordinate, the
TNC will first move the tool to P
move it to the entered depth in the tool axis.
End point PN
The position P lies outside of the contour and results from your
N
input in the DEP block. If the DEP block also contains a Z axis
coordinate, the TNC will first move the tool to P
plane, and then move it to the entered depth in the tool axis.
Abbreviation
APPR
DEP
L
C
T
N
The TNC does not check whether the programmed
contour will be damaged when moving from the
actual position to the auxiliary point P
graphics to check.
With the APPR LT, APPR LN and APPR CT functions,
the TNC moves the tool from the actual position to
the auxiliary point P
that was last programmed. With the APPR LCT
function, the TNC moves to the auxiliary point P
the feed rate programmed with the APPR block. If no
feed rate is programmed before the approach block,
the TNC generates an error message.
TNC 620 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
Approaching and departing a contour
at the feed rate last programmed. If you
H
at rapid traverse.
H
E
in the APPR block.
A
can be programmed with any path
E
in the working plane, and then
H
N
Meaning
Approach
Departure
Line
Circle
Tangential (smooth connection)
Normal (perpendicular)
H
at the feed rate/rapid traverse
H
S
in the working
. Use the test
at
H
6
6.3
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