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TNC 426/TNC 425/TNC 415 B/TNC 407
1-16
1
Introduction
The polar coordinate system can also express both
types of dimensions:
•
Absolute polar coordinates
always refer to the
pole (I, J) and the reference axis.
•
Incremental polar coordinates
always refer to
the last nominal position of the tool.
Fig. 1.17:
Incremental dimensions in polar coordinates
(designated by G91)
1.2
Fundamentals of NC
X
Y
J = 10
0
°
I = 30
R
R
R
G91R
G91H
G91H
H