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 in the block before the APPR block.
P lies outside the contour and is approached without radius
S
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
last contour point P can be programmed with any path function.
E
If the APPR block also includes the Z coordinate, then the TNC
moves the tool simultaneously to the first contour point P
End point P
N
The position P lies outside of the contour and results from
N
your input in the DEP block. If the DEP block also includes the Z
coordinate, then the TNC moves the tool simultaneously to the
end point P .
N
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
last programmed. With the APPR LCT function, the
TNC moves to the auxiliary point P
programmed with the APPR block. If no feed rate
is programmed before the approach block, the TNC
generates an error message.
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015
Approaching and departing a contour
at the feed rate last programmed. If you
H
at rapid traverse.
H
E
in the APPR block. The
A
Meaning
Approach
Departure
Line
Circle
Tangential (smooth connection)
Normal (perpendicular)
H
at the feed rate that was
H
at the feed rate
H
.
A
. Use the test
6
6.3
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