HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 115)

99 HEIDENHAIN TNC 410, TNC 426, TNC 430
Radius compensation
Radius compensation must be programmed before the block
containing the coordinates for the first contour element. You cannot
begin radius compensation in a circle block. It must be activated
beforehand in a straight-line block.
Straight-line block, see „6.4 Path Contours _ Polar Coordinates“.
Pre-positioning
Before running a part program, always pre-position the tool to
prevent the possibility of damaging it or the workpiece.
6.3 Contour Approach and Departure
Starting point and end point
The tool approaches the first contour point from the starting point.
The starting point must be:
■ Programmed without radius compensation
■ Approachable without danger of collision
■ Close to the first contour point
In order to make sure the contour will not be damaged, the optimal
starting point should lie on the extended tool path for machining
the first contour element.
Example
Figure at upper right: If you set the starting point in the dark gray
area, the contour will be damaged when the first contour element
is approached.
First contour point
You need to program a radius compensation for the tool movement
to the first contour point.
6.3 Cont
our
Appr
oac
h and Depar
tu
re
X
Y
A
G41
X
Y
S
A
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