HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 172)

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6.5 P
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th Cont
ours—P
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lar Coor
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Polar coordinate origin: Pole CC
You can define the pole CC anywhere in the part program before
blocks containing polar coordinates. Enter the pole in Cartesian
coordinates as a circle center in a CC block.
 Coordinates CC: Enter Cartesian coordinates for the
pole, or
If you want to use the last programmed position, do
not enter any coordinates. Before programming polar
coordinates, define the pole CC. You can only define
the pole CC in Cartesian coordinates. The pole CC
remains in effect until you define a new pole CC.
Example NC blocks
Straight line LP
The tool moves in a straight line from its current position to the
straight-line end point. The starting point is the end point of the
preceding block.
 Polar coordinates radius PR: Enter the distance
from the pole CC to the straight-line end point.
 Polar coordinates angle PA: Angular position of the
straight-line end point between –360° and +360°.
The sign of PA depends on the angle reference axis:
„ Angle from angle reference axis to PR is counterclockwise: PA>0
„ Angle from angle reference axis to PR is clockwise: PA<0
Example NC blocks
X
Y
CC
X
CC
Y
CC
12 CC X+45 Y+25
X
Y
45
25
60°
60°
30
CC
12 CC X+45 Y+25
13 LP PR+30 PA+0 RR F300 M3
14 LP PA+60
15 LP IPA+60
16 LP PA+180