First real bout with Stainess 316 today. What a disaster! Rat chewed finish at all speeds and feeds (manually fed, with speeds varying from 100 rpm to about4000 -- VFD's rock when coupled with a manual speed changer).
Carbide Tool Holder: Set first at dead center, experimented with a bit over and a bit under, many different speeds... No positive results.
Lathe/Crossslide/Chuck: Everything tight, lined up and on center, etc. A remote possibility is that one of the balls in the front bearings might be getting ready to eat itself (when I put the earphones to the front main bearing I get an occasional "hick"). Six jaw chuck zeroed, etc. Everything else, good to go.
I got alot of pretty good curly brown-blue chips going once the front surface of the work was "smooth", and all you could hear was the shhhhhhhhh of the metal parting as the carbide went through it. BUT -- the finish still sucked. It sucked less than when it *sounded* like it was getting chewed, but not by less.
Ultimately toasted an entire box of carbite insert bits, both sides for a grand total of 20 ruined tools. Best finish was with a HSS hand ground tool bit. Go figure.
Now, before everyone says 303 or even 304, I need the welding properties of the316. I can't use the HSS bits because the steel will imbed and ultimately rust and ruin the finish (you know, the one I cant' get in the first place).
Anyone have any suggestions? I've seen some newer alloys that promise equal welding qualities and easy machining, but they aren't sold at the "small amount" shops like Online Metals.
Thanks..... As always, all help appreciated.
(same question also posted at HSM&MW BBS)