Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 526)

Dresser/Wheel Radius Compensation
Chapter 15
15-38
When necessary, the control generates extra motion blocks to keep the
dresser/wheel in tolerance of the desired path. This becomes necessary
when the intersection of paths is an outside path (as defined on page 15-2)
that has an angle as follows:
Between 0
°
and 90
°
during radius compensation left (G41)
Between 270
°
and 360
°
during radius compensation right (G42)
Figure 15.30 through Figure 15.33 illustrate the basic motion of the
dresser/wheel as it executes program blocks during radius compensation.
Figure 15.30
Dresser/Wheel Radius Compensation Paths Straight Line-to-Straight
Line
180
≤ θ ≤
270
270
≤ θ ≤ 360
90
≤ θ ≤
180
0
≤ θ ≤
90
generated block
G41
G42
Programmed path
G41
G42
Programmed path
θ
G41
G42
Programmed path
θ
θ
θ
G41
G42
Programmed path
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
0
≤ θ ≤
90
G41
G42
Programmed path
θ r
r
r
r
G39.1 (Circular Generated Block) G39 (Linear Generated Block)
G39.1 (Circular Generated Block) G39 (Linear Generated Block)
270
≤ θ ≤ 360
θ
G41
G42
Programmed path
r
r
r
r
r
generated block
Linear
Circular
generated
Linear
block
generated
Circular
block
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