Anyone have any suggesetions for sfm for platinum? or even recommended feed and rpm? I am using carbide inserts in a lathe. any help will be appreciated.

platinum is pretty soft....why don't you experiment.....

well, they are too expensive for me to 'experiment'. I've tried the settings for gold but it give me very rough finish and such. I was just wondering if anyone here have any experience working with plat. thanks.

I'd use HSS steel and grind to a high positive rake, since chip flow is the typical priority when turning soft gummy materials. And, unless you are turning some 2" diameter solid round (or larger $$ :D $$), on a typical lathe you might have a hard time overspeeding, so just run it fast and feed it at such a rate as to give the required surface roughness.

A high positive rake tool may also curl the chips into a coil so you can find every last particle, as well ;)