[Johnboy13]

Hello, I'm having some trouble finding good speeds and feeds for copper. I'm working with .500" bar stock. Does anyone have some general guidelines for running this material? Thanks.

[ianglover]

Turn it a lot on sliding heads, generally you need to peel it off, I would try 90m/min and a feed rate of .015-.02mm/rev, and you need a good coolant supply, I use neat cutting oil. I use Seco DCMT11T304 F1 in CP500. Or alternatively use alum geom. drilling use a carbide drill and keep the revs down, slow feed and small pecks.

[Johnboy13]

Ok, thanks. I'll try this. I've been putting this material off because I broke a drill.

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[bapper]

An old school toolmaker trick is to sharpen the tip of your drill slightly off centre so it drills a bit oversize, then in any non errous metal use a good fluid even a few drops of kerosene works just enough to keep the tip lubed so debris does not gum up or stick to the drill