Siemens Sinumerik 840D Operating Turning page 64

Section 5
Notes
B503
B503
Circular interpolation
5.2 Circular interpolation with mixed programming
Particularly the incremental statement of the centre of the circle usually
represents some difficulties to the operator in practice, since it must often
be evaluated using triangle calculations.
This is a prime example of where the mixed coordinate programming of the
interpolation parameters in absolute dimensions comes in useful.
Programming example:
.....
N40 G00 X30 Y40 Z2
N50 G01 Z-5
N60 G02 X50 Y40 I=AC(40) J=AC(33)
N70 G01 Z2 F1000
.....
Y
start point
J
Y
30
40
Page 10
Explanation:
Circle centre absolute
destination point
centre point
I
50
X
840D/828D SINUMERIK Operate