Hi Al...
I'm no expert, just playing with lazycam too, but I think the " step" refers to how far over your mill end
or router bit shifts over for the second lap around the object you are cutting, if it is step 25% of a 1 inch bit, then after
2 laps, the cut would be 1.75"wide. the first cut 1", and the second cut 1 inch but it overlaps the first cut by 25%, so only 75% new material would be cut out of it.
Hope this helps!
Glenn
Oh yea, I couldn't get anything to change when the overhang parameter box was filled in with different %'s