Another solid tool post riser

Broke my 1st insert on some copper the other night.
BTW, copper is not self-lubricating like brass or bronze. It's very ductile - stringy chips and 'grabby'. I'm not an expert, but the times i've done work on copper a mist setup worked well to keep the part, tool, and chips cold. Colder = more likely to break chips than birds-nest and jam up.
 
I recall from deep in my dim past that the preferred lube for copper is "lard oil." Back when I was a grad student, I'd occasionally have to drill tiny holes (~#60) in copper, and lard oil, borrowed from our on-site machine shop, definitely helped.
 
I read somewhere that full fat milk is great for copper.

I will have to check into a better set up for my parting operations. I really dread parting on steel or anything tough.
 
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