https://forums.autodesk.com/t5/machining-discussions-forum/drilling-aluminum-full-or-partial-retract/m-p/6098753#M4469 <BLOCKQUOTE><TABLE border="1"><TBODY><TR><TH>N. Stein wrote:</TH></TR><TR><TD><BR />I run 2% of drill diameter per revolution for feed. Usually quite safe in aluminum and mild steels. Feed harder in plastics. No experience with the mister, but with flood I will chip break peck (high speed peck, whatever you want to call it) through about an inch without thinking about it if my drill is over .200". I don't see why you wouldn't get away with it though. If you're worried, try it on a piece of scrap first.<BR /><BR />My default is 200SFM for HSS uncoated drills, so for your .204" I would run 3745 RPM @ 15.28 IPM.<BR /><BR />Your chipload appears to be .0027/flute. Should work but nearing 3% drill diameter that I run as a maximum.<BR /></TD></TR></TBODY></TABLE></BLOCKQUOTE><BR /><BR />Sounds like he has got only mist cooling and no flood. But that might be wrong.<BR />About feed and speed totally depends on your tool. I've got HSS drills where a 10mm drill can feed 0.35mm/rev and ones that can only handle 0.16 mm/rev so not really something one can judge if it's optimal. Thu, 29 Oct 2015 06:00:55 GMT Laurens-3DTechDraw 2015-10-29T06:00:55Z