Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 505)

Cutter Comp/Tool Tip Radius
Chapter 23
23-5
Function
During cutter compensation, use this parameter to determine the minimum
length that a linear generated block may be. Note that these generated
blocks, as shown in Figure 23.2, are not created by the programmer; they
are blocks that the control generates to correctly compensate a
programmed path without over-cutting.
Use this parameter only in G39 Linear Generated Block cases; it is not
used for G39.1 Circular Generated Block cases.
Figure 23.2
Cutter Comp Generated Blocks
G39 (Linear Generated Block)
end of
1st cut
start of
2nd cut
G42 tool path
programmed
path
r
r
r
block
generated
r
linear
If a generated block length is smaller than the value set for this parameter,
the control ignores the generated block. It is not executed and the control
continues to the intersection of the compensated paths. For example, if a
Minimum Block Length of .75 inches is set in AMP, and if the generated
block length is 0.5, the generated tool path is ignored as shown in
Figure 23.3.
Figure 23.3
Cutter Comp With Too Small of a Generated Block
G39 (Linear Generated Block)
end of
1st cut
start of
2nd cut
G42 tool path
programmed
path
r
r
Axis Parameter
Number
All [27]
23.1.3
Minimum Block Generation
Length