HEIDENHAIN TNC 407 (280 580) User Manual - Manual (Page 127)

TNC 425/TNC 415 B/TNC 407 5-28
5 Programming Tool Movements
Fig. 5.37: The path of a tangential arc depends on the preceding
contour
element
Fig. 5.36: The straight line 1 - 2 is connected tangentially to the
circular arc S - E
5.4 Path Contours - Cartesian Coordinates
1 2
E
S
E
L1
L2
L3
CT3
CT1
CT2
S
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
Prerequisites:
• The contour element to which the tangential arc connects must be
programmed immediately before the CT block.
• 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.