HEIDENHAIN TNC 370 User Manual page 122

5 Programming Tool Movements
5.4 Path Contours - Cartesian Coordinates
Circular path CT with tangential connection
The tool moves in an arc that starts at a tangent
with the previously programmed contour element.
A transition between two contour elements is
called tangential when one contour element makes
a smooth and continuous transition to the next.
There is no visible corner at the intersection.
Input
Coordinates of the arc end point.
0
l -----------------------------
0 0
-\,
0
Fig. 5.32: The straight line @ - @ is connected tangentially to the
circular arc @ - @
Fig. 5.33:
The path of a tangential arc depends on the preceding
contour element
Prerequisites:
l
The contour element to which the tangential arc connects must be
programmed immediately before the CT block.
l
There must be at least two positioning blocks defining the tangentially
connected contour element before the CT block.
A tangential arc is a two-dimensional operation: the coordinates in the CT block and in the positioning block before
it should
be
in the plane of the arc.
L.
TNC 370
5-23