Copper Machining Masters. I need you knowledge.

[CheeseBall]

Today I FINALY really got started on my block (Can't wait to have my rig DONE!). Now I'm new to machining copper, so I would like some advice.

While using a fly cutting, I would like to know what you guys have found to be good machining technique for copper. Including:
1) Best spindle speed.
2) Max rough cut.
3) Max/best finish cut.

I am mostly worried about the base's finish. Have any of you gotten a good enough finish to where sanding wasn't necessary? You would suggest using a fly cutter for the bottom of base, correct?

Also, what about using a 1/2"-3/4" endmill. What speed, etc?

All your advice will be much appriciated,
Bryan

[pippin88]

Originally posted by CheeseBall
Today I FINALY really got started on my block (Can't wait to have my rig DONE!). Now I'm new to machining copper, so I would like some advice.

While using a fly cutting, I would like to know what you guys have found to be good machining technique for copper. Including:
1) Best spindle speed.
2) Max rough cut.
3) Max/best finish cut.

I am mostly worried about the base's finish. Have any of you gotten a good enough finish to where sanding wasn't necessary? You would suggest using a fly cutter for the bottom of base, correct?

Also, what about using a 1/2"-3/4" endmill. What speed, etc?

All your advice will be much appriciated,
Bryan

There are many guides for this and many good books.

But basically I think you want to go fast with copper, as the tool gets bigger you should slow down a bit. Use some form of coolant too.

I just had my first play with the flycutter that came with the mill. Its a multi cutter number worth about $150-250 AUD.

Pretty fast spindle speed, very thin cuts.

You will never get a good enough surface with a flycutter to avoid sanding. It does however allow you to get a very flat surface, meaning sanding should be pretty quick.