Been trying to turn a bar of aluminum down from 1.250 to 1.000 so I can use my 5C collet chuck to hold the piece.. I know I know why didn't I buy 1.0" bar to begin with.. hehe
Attached are some pictures of the results I'm getting.. Using kennametal inserts (CNGP) made for aluminum.. flooding with coolant.. 200 SFM, 0.005 in/rev, .005 DOC.. real gentle.. RPM comes out to about 600-700 RPM.
Is this type of cut impossible with the piece extended out as far as it is - I know a tailstock would likely be appropriate but my current tools are too short to use with the tailstock and it will take a week to get some longer tool holders.
So my question is - is this just plain old chatter due to flexing of the part? and is there a way to actually cut this bar as is (either through some combination of in/rev, SFM)?