HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 228)

Programming: Programming contours
6.4 Path contours - Cartesian coordinates
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
Circle G06 with tangential connection
The tool moves on an arc that starts tangentially to the previously
programmed contour element.
A transition between two contour elements is called tangential
when there is no kink or corner at the intersection between the
two contours—the transition is smooth.
The contour element to which the tangential arc connects must be
programmed immediately before the
G06 block. This requires at
least two positioning blocks.
Coordinates of the arc end point, and if
necessary:
Feed rate F
Miscellaneous function M
Example NC blocks
N70 G01 G41 X+0 Y+25 F300 M3 *
N80 X+25 Y+30 *
N90 G06 X+45 Y+20 *
G01 Y+0 *
A tangential arc is a two-dimensional operation:
the coordinates in the
G06 block and in the contour
element preceding it must be in the same plane of
the arc!