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3 contour approach and departure, Important positions for approach and departure – HEIDENHAIN iTNC 530 (340 49x-04) User Manual

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242

6 Programming: Programming Contours

6.3 Cont

our Appr

oac

h

and Depar

tur

e

6.3 Contour Approach and Departure

Overview: Types of paths for contour approach
and departure

The functions for contour approach APPR and departure DEP are
activated with the APPR/DEP key. You can then select the desired
path function with the corresponding soft key:

Approaching and departing a helix

The tool approaches and departs a helix on its extension by moving in
a circular arc that connects tangentially to the contour. You program
helical approach and departure with the APPR CT and DEP CT
functions.

Important positions for approach and departure

„

Starting point P

S

You program this position in the block before the APPR block. Ps 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

H

that the TNC calculates from your input in the

APPR or DEP block. The TNC moves from the current position to the
auxiliary point P

H

at the feed rate last programmed.

„

First contour point P

A

and last contour point P

E

You program the first contour point P

A

in the APPR block. The last

contour point P

E

can be programmed with any path function. If the

APPR block also contains a Z axis coordinate, the TNC will first move
the tool to P

H

in the working plane, and then move it to the entered

depth in the tool axis.

„

End point P

N

The position P

N

lies outside of the contour and results from your

input in the DEP block. If the DEP block also contains a Z axis
coordinate, the TNC will first move the tool to P

H

in the working

plane, and then move it to the entered height in the tool axis.

Function

Approach

Departure

Straight line with tangential connection

Straight line perpendicular to a contour
point

Circular arc with tangential connection

Circular arc with tangential connection
to the contour. Approach and departure
to an auxiliary point outside the contour
on a tangentially connecting line.

P

H

RL

P

S

R0

P

A

RL

P

E

RL

RL

RL

P

N

R0