HEIDENHAIN TNC 640 (34059x-04) - Manual (Page 226)

Programming: Programming contours
6.5 Path contours – Polar coordinates
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
Circular path CP around pole CC
The polar coordinate radius PR is also the radius of the arc. PR is
defined by the distance from the starting point to the pole CC. The
last programmed tool position will be the starting point of the arc.
Polar coordinate angle PA: Angular position of
the arc end point between -99999.9999° and
+99999.9999°
Direction of rotation DR
Example NC blocks
18 CC X+25 Y+25
19 LP PR+20 PA+0 RR F250 M3
20 CP PA+180 DR+
For incremental coordinates, enter the same sign for
DR and PA.
Circle CTP with tangential connection
The tool moves on a circular path, starting tangentially from a
preceding contour element.
Polar coordinate radius PR: Distance between
the arc end point and the pole
CC
Polar coordinate angle PA: Angular position of the
arc end point.
The pole is not the center of the contour arc!
Example NC blocks
12 CC X+40 Y+35
13 L X+0 Y+35 RL F250 M3
14 LP PR+25 PA+120
15 CTP PR+30 PA+30
16 L Y+0