I'm new to high speed machining. I'm cutting a brass part
http://i1262.photobucket.com/albums/...63/Chatter.jpg
with a 4mm HSS Co TICN cutter. The surfacing works fine, but when I try to make a deep counterbore I get a really bad finish. I'm running the tool at 10k rpm (spindle range is 8k-25k rpm) and the finishing pass at F300. I'm not sure what my F values actually mean, like in ipm, but it looks like a good speed. I suppose my my options are to use a carbide cutter, go to 6mm diameter (max on this spindle), or adjust the feedrate and spindle speed. Can anyone take a look and make suggestions? I know I should get myself a proper knee mill, but that's not a realistic option for me at the moment. I'm hoping the machine I have
http://i1262.photobucket.com/albums/...r1963/CNC1.jpg
will be adequate if I tweak the operation enough.