HEIDENHAIN TNC 620 User Manual page 260

6
Programming contours
Path contours  Cartesian coordinates
6.4
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 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*
N100 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!
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HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016