HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 230)

Programming: Programming contours
6.5 Path contours – Polar coordinates
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TNC 620 | User's ManualDIN/ISO Programming | 2/2015
Circular path G12/G13/G15 around pole I, J
The polar coordinate radius R is also the radius of the arc. R is
defined by the distance from the starting point to the pole I, J. The
last programmed tool position will be the starting point of the arc.
Direction of rotation
In clockwise direction: G12
In counterclockwise direction: G13
Without programmed direction: G15. The TNC traverses the
circular arc with the last programmed direction of rotation
Polar coordinate angle H: Angular position of
the arc end point between -99999.9999° and
+99999.9999°
Direction of rotation DR
Example NC blocks
N180 I+25 J+25 *
N190 G11 G42 R+20 H+0 F250 M3 *
N200 G13 H+180 *
For incremental coordinates, enter the same sign for
DR and PA.
Consider this behavior when importing programs
from earlier controls. Adapt the program if required.
Circle G16 with tangential connection
The tool moves on a circular path, starting tangentially from a
preceding contour element.
Polar coordinate radius R: Distance between the
arc end point and the pole
I, J
Polar coordinate angle H: Angular position of the
arc end point.
The pole is not the center of the contour arc!
Example NC blocks
N120 I+40 J+35 *
N130 G01 G42 X+0 Y+35 F250 M3 *
N140 G11 R+25 H+120 *
N150 G16 R+30 H+30 *
N160 G01 Y+0 *