Milling copper

[Burn]

http://www1.mscdirect.com/CGI/NNSRIT...90938&PMT4NO=0

That one look good for a 3/8" endmill? I think so, but I am the newbie here

http://www1.mscdirect.com/CGI/NNSRIT...90936&PMT4NO=0

For the 1/4" cutter?

[dertsap]

copper is quite abrasive i would suggest carbide well above hss if you plan to do lots of cutting

[Burn]

:\ I wish I had the money to buy solid carbide tooling but unfortunately a small machine shop like me doesn't have the cash to buy those kinds of endmills.

[Stepper Monkey]

I am nowhere near good enough to offer any comment on the exact feed and speed that would be optimal, and I would easily trust in the advice previously given a few posts back.
I do however, have the same Taig setup you will be using, and I thought I might point out that the numbers suggested also did assume a 2 to 3 horsepower spindle. Remember that you are using a very small mill, and will only have a 1/4 HP to play with using the stock setup. I seldom use mills above 1/8", and 1/4" mills often push the machine pretty hard.
Keep the cuts light - copper will grab and seize that Taig up REAL easily.

[fizzissist]

Originally Posted by dertsap copper is quite abrasive i would suggest carbide well above hss if you plan to do lots of cutting

dertsap is right, you'll end up using more money in HSS than if you'd bit the bullet and bought good carbide. Been there, done that.

At least you can use a too-dull-for-copper-anymore tool on aluminum or stainless quite often.

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Thread forming taps for helicoil....at MSC...duh.
http://www.mscind.com/PDF/2005/260.pdf