well the od does matter cause your tool is cutting on the circum of the part. bigger the circum the greater the distance for the cutter to travel. 52 degrees on 1.4 cir is not the same as 52 degrees on 1.5 cir.
1.4=4.3982 cir cir/360=.0122 per degree 52*.0122=.6344 travel around cir
1.5=4.7123 cir cir/360=.0130 per degree 52*.0130=.676 " " "
remember that you may program z .340 but cutter travels more than that because its moving around cir on an helix(pitch)
I do understand that a degree feedrate with just c axis is not the same as z and c going together. with both going then your pitch has to be included as well. I think...
