casting copper
Talking with dad the other day, I found out that molten copper doesn't stick to steel, so today I drilled a hole in a chink of steel, and melted some CU into it. Success! came right out with a few hammer taps.
So now, I'm thnking of making a mold outta a chunk of steel (I got any thickness of steel I'd need... trust me), and then melting all the scrap copper I have (collapsed pipes, etc).
Only problem, I'm having a hard time milling out the copper mold! I have a 3/4 inch bit spinning @ 1137 RPM, and it didn't cut it, and screeced and chatter like a bitch. So I slowed it down to 300 RPM, went a little better, but something wasn't cutting right.
Anyway, what RPM's should I run the mill bit at?
thankyou
-,e
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