HEIDENHAIN TNC 426 (280 476) - Manual (Page 179)

152 6 Programming: Programming Contours
6.5 P
ath Cont
ours
—
P
olar Coor
dinat
e
s
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.
7 7 7 7 Polar coordinates radius PR : Enter the distance
from the pole CC to the straight-line end point.
7 7 7 7 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:
n Angle from angle reference axis to PR is counterclockwise: PA>0
n Angle from angle reference axis to PR is clockwise: PA<0
Example NC blocks
Circular path CP around pole CC
The polar coordinate radius PR is also the radius of the arc. It is defined
by the distance from the starting point to the pole CC. The last
programmed tool position before the CP block is the starting point of
the arc.
7 7 7 7 Polar-coordinates angle PA: Angular position of the
arc end point between –5400° and +5400°
7 7 7 7 Direction of rotation DR
Example NC blocks
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
X
Y
45
25
60°
60°
30
CC
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.
X
Y
25
25
R20
CC