feed and speed / sfm

[citra]

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.

[ViperTX]

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

[citra]

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.

[HuFlungDung]

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 $$ $$), 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