GSK 980MDc, User Manual

Page: 54 / 473

Chapter 3 G Command
35
I Programming
length arc circular
length axis linear
F f
× =
Helical interpolation path is as follows:
X
Z
Y
T o o l p a th
T h e fe e d ra te a lo n g th e c irc u m fe re n c e o f tw o c irc u la r
in te rp o la te d a x e s is th e s p e c ifie d fe e d ra te
I, J and K have signs according to the direction. The circular center also can be specified by radius R
other than I, J and K, as follows:
G02 X_ Y_ R_ ;
G03 X_ Y_ R_ ;
Now, the following two arcs can be described, one arc is more than 180°, the other is less than 180°.
The arc radius which is less than 180° is specified by the positive value; the arc radius which is more than
180° is specified by the negative value. The radius is either positive or negative when the arc command is
equal to 180°.
(Example) Arc
①
less than 180°
G91 G02 X60.0 Y20.0 R50.0 F300.0;
Arc
②
more than 180°
G91 G02 X60.0 Y20.0 R-50.0 F300.0;
(Example for the programming)