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3 cont our appr oac h and depar tu re – HEIDENHAIN TNC 410 User Manual

Page 82

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69

HEIDENHAIN TNC 410

You can enter the position data in absolute or incremental
coordinates and in Cartesian or polar coordinates.

The TNC does not check whether the programmed contour will be
damaged when moving from the actual position to the auxiliary
point P

H

. Use the test graphics to simulate approach and departure

before executing the part program.

When approaching the contour, allow sufficient distance between
the starting point P

S

and the first contour point P

A

to assure that the

TNC will reach the programmed feed rate for machining.

The TNC moves the tool from the actual position to the auxiliary
point P

H

at the feed rate that was last programmed.

Radius compensation
For the TNC to interpret an APPR block as an approach block you
must program a change in compensation from R0 to RL/RR. The
TNC automatically cancels the radius compensation in a DEP block.
If you wish to program a contour element with the DEP block (no
change in compensation), then you need to program the active
radius compensation again (2nd soft-key row, if the F element is
highlighted).

If no change in compensation is programmed in an APPR or in a
DEP block, the TNC makes the contour connection as follows:

Function

Contour connection

APPR LT

Tangential connection to the following
contour element

APPR LN

Perpendicular connection to the following
contour element

APPR CT

without angle of traverse/without radius:
Tangentially connecting circular arc between the
preceding and the following contour element.
without angle of traverse/with radius:
Tangentially connecting circular arc with programmed
radius to the following contour element
with angle of traverse/without radius:
Tangentially connecting circular are with angle of
traverse to the following contour element
with angle of traverse/with radius:
Tangentially connecting circular arc with connecting
line and angle of traverse to the following contour
element

APPR LCT

Tangent with connecting tangential
circular arc to the following contour element

Abbreviation

Meaning

APPR

Approach

DEP

Departure

L

Line

C

Circle

T

Tangential
(smooth connection)

N

Normal (perpendicular)

6.3 Cont

our

Appr

oac

h and Depar

tu

re

Function Contour connection

DEP LT

Tangential connection to the
preceding contour element

DEP LN

Perpendicular connection to the
preceding contour element

DEP CT

without angle of traverse/without radius:
Tangentially connecting circular arc
between the preceding and the following
contour element
without angle of traverse/with radius:
Tangentially connecting circular arc with
programmed radius to the
preceding contour element
with angle of traverse/without radius:
Tangentially connecting circular arc with
angle of traverse to the preceding contour
element
with angle of traverse/with radius:
Tangentially connecting circular arc with
connecting line and angle of traverse
to the preceding contour element

DEP LCT Tangent with tangentially

connecting circular arc to the
preceding contour element