@Bobbond000 I know this is 4mo ago so you probably have a stable setup now. However given you have a VFD, did you see the effect varying spindle speeds have on chips and how they break? According to theory, Aluminium should be cut at as high of an RPM as possible to push surface speeds close to 1000 sfm which would induce a change from plastic deformation to a more brittle break. I posted a few links here one of these is to a manufacturer of small cutters. I’m wondering if we’re seeing that effect on our machines already or are our forces still too low for the difference to matter.