HEIDENHAIN iTNC 530 (340 420) ISO programming - Manual (Page 177)

HEIDENHAIN TNC iTNC 530 177
6.5 P
a
th Cont
ours—P
olar Coor
dinat
e
s
6.5 Path Contours—Polar
Coordinates
Overview of path functions with polar
coordinates
With polar coordinates you can define a position in terms of its angle
H
and its distance R relative to a previously defined pole I, J (see
“Definition of pole and angle reference axis,” page 66).
Polar coordinates are useful with:
n
Positions on circular arcs
n
Workpiece drawing dimensions in degrees, e.g. bolt hole circles
Zero point for polar coordinates: pole I, J
You can set the pole I, J at any point in the machining program, before
indicating points in polar coordinates. Set the pole in the same way as
you would program the circle center.
Programming
U U U U Enter Cartesian coordinates for the pole, or
if you want to use the last programmed position,
enter G29. Before programming polar coordinates,
define the pole. You can only define the pole in
Cartesian coordinates. The pole remains in effect until
you define a new pole.
Example NC blocks
Tool movement Function Required input
Straight line at feed rate
Straight line at rapid traverse G10
G11 Polar radius, polar angle of the straight-line end point
Circular path in clockwise direction
Circular path in counterclockwise direction G12
G13 Polar angle of the circle end point
Circular path corresponding to active direction of
rotation G15 Polar angle of the circle end point
Circular arc with tangential connection to the
preceding contour element G16 Polar radius, polar angle of the arc end point
N120 I+45 J+45 *
X
Y
X=I
Y=J