Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 397)

Axis Motion
Chapter 12
12-25
Corner Radius
Program a ,R--word to grind a radius between two consecutive intersecting
paths. The radius word R must follow a comma (,) and is programmed in
the first of two paths to be connected by the radius.
The value programmed with the ,R determines the radius size. Regardless
of whether the programmed paths are linear or circular, a circular move of
the programmed radius is executed tangent to both paths. If the control
cannot make an arc that is tangent to both paths, an error is generated.
Important: If the two motion blocks are tangent to each other, then any
corner rounding commands are ignored.
The ,R--word can be programmed anywhere in a block as long as no space
is programmed before or after the ,R--word. The value programmed with
the ,R is an incremental distance not affected by radius or diameter
programming (G07 or G08).
Example 12.15
Programming a Radius for a Circular Path into a Linear path.
N10Z10X30.F.1;
N20G02X10.Z10.R10,R3;
N30Z30.X10.;
Figure 12.16
Results of Radius for a Circular Path into a Linear path, Example 12.15
Z
X
30
25
20
15
10
25 20 15 10 5
Actual start point of block N30 and
end point of corner radius Programmed end
point of block N20
Actual end point of
block N20 and start
point of corner radius
R
N20
N30
12156-I