HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 173)

HEIDENHAIN TNC 620 173
6.5 P
a
th Cont
ours—P
o
lar Coor
dinat
e
s
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.
 Polar-coordinates angle PA: Angular position of the
arc end point between –99 999.9999° and
+99 999.9999°
 Direction of rotation DR
Example NC blocks
Circular path CTP with tangential connection
The tool moves on a circular path, starting tangentially from a
preceding contour element.
 Polar coordinates radius PR: Distance from the arc
end point to the pole CC
 Polar coordinates angle PA: Angular position of the
arc end point
Example NC blocks
X
Y
25
25
R20
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
40
35
CC
30°
120°
R30 R25
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
The pole CC is not the center of the contour arc!