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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Posted to alt.machines.cnc,rec.crafts.metalworking
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Deep c-sinking on a manual lathe...
Awl--
90 deg 3-flute c-sink, .225" deep into 6061 alum that is already substantially c-drilled, #5, about .250 deep. Problem: chatter marks, altho not audible, and not really bad looking--not a bad effect, really. Just would like a really smooth finish on occasion, which I achieved once, but have not been able to replicate. I have found a slow rpm much "friendlier" than faster rpms, ie, less than 300, vs. over 750. True? Push w/ more force? Less? some combo w/ different rpm? "Finish cut"? Diff. style c-sink? Oils? TIA. -- Mr. P.V.'d formerly Droll Troll |
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