Radius Programming - Siemens SINUMERIK 880 Programming Manual

05.91
4.2.2.2

Radius programming

In many cases the dimensions of a drawing are such that it is easier to specify radius B or U
when defining the circular path.
Since the radius in conjunction with G02 or G03 can only specify a definite circular path within
a semicircle, it is necessary to specify in addition whether the traversing angle is to be greater
or less than 180°.
Thus the radius is given the following sign:
+ B/ + U: Angle less than or equal to 180°
– B/ – U: Angle greater than 180°
It is not permissible to program the radius if the traversing angle is 0° or 360°. Full circles
must therefore be programmed using interpolation parameters.
If there is no circle for the programmed radius that passes through the circle start and circle
end point, the alarm 2048 (circle end point error) will be displayed.
G02 or G03 determines the direction of movement about the circle defined by means of the
circle end point and the interpolation parameters or by means of radius B or U.
Example: Radius programming
X
30
20
10
W
Example: Radius programming
N05 G03 G90 X15 Z60 B15
N10 G02 G90 X30 Z45 B15
The radius designation is determined by
© Siemens AG 1991 All Rights Reserved
SINUMERIK 880, (PG)
P1
B
P2
20 40 60
L F
L F
machine data as follows:
generally B for turning machines and
U for milling machines.
6ZB5 410-0HD02
4 Programming of Motion Blocks
4.2.2 Circular interpolation G02/G03
KM
80
Tool traverse from P1 to P2
Tool traverse from P2 to P1
Z
4–11