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

Programming contours | Approaching and departing a contour

Important positions for approach and departure

Danger of collision!
The control traverses from the current position (starting point
P ) to the auxiliary point P
S
programmed FMAX in the last positioning block before the
approach function, the control also approaches the auxiliary point
P at rapid traverse.
H
Program a feed rate other than FMAX before the approach
function
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 control calculates from your input in the
H
APPR or DEP block.
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, the control
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, the control moves the tool simultaneously to the end
point P .
N
Designation Meaning
Approach
APPR
Departure
DEP
Line
L
Circle
C
Tangential (smooth connection)
T
Normal (perpendicular)
N
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022
NOTICE
at the last feed rate entered. If you
H
E
in the APPR block. The
A
.
A
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