Why so slow ? 45m/min in Al should be up round the 200+ area , we use max rpm of the m/c S6000
Having trouble milling 16mm dia. x 12mm long spigot in some aluminium components i am making, as in i cant get this dia. to the roundness tolerance required. .02mm t.i.r. should be achievable and ive achieved much better than this before, I am using 12mm solid carbide endmill 1200rpm 200mm per min feed, climb milling, have tried straight and radial approach and exit - no difference.
What CBD cutters ? designed for Al - extra sharp, hi-helix and all that jazz ?
Is the machine giving the same out of round bores / bosses on previous jobs, if not then it should be something in this part giving the problem
Parts are .08mm out of round , set up is super rigid, 6061-t6 alum. no prob there, m/c slideways are like new and gibs are all adjusted spot on and as i have known m/c since new -its never had a big prang and never done hard work.
quite often this may be the way the part is done, if say 2nd Op and thin walls and floors exist then the possiblitly of flexing occurs.
Try ramping the OD of the spigot, only having a small amount of contact with each flute
you know what I mean.
G43 H1 Z20.
G1 Z0. F2000.
G41 X14. Y2. D1 F550
G2 X14. Y0. R-14. Z-2.
X14. Y0. R-14. Z-4.
X14. Y0. R-14. Z-6.
X14. Y0. R-14. Z-8.
X14. Y0. R-14. Z-10.
X14. Y0. R-14. Z-12.
X14. Y0. R-14. ( last is repeated to give flat floor )
If you cannot interpolate a true diameter, then it should be considered a machine problem needing attention ( backlash, leadscrew, nut, bearings and thrust bearings )
90% of the time it is a programming strategy that needs refining