HEIDENHAIN TNC 310 (286 140) - Manual (Page 73)

61 HEIDENHAIN TNC 310
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