Hello all - I recently bought some Busch burrs for using with silver. I intend to use them to open out a predrilled hole into a conical shape to take faceted gemstones in my first attempt at a Gipsy setting.

I wondered what sort of RPM these are best used at? In my head I think it should be probably as fast as possible (think my proxxon goes up to 20k rpm) since the diameter of the burr is very small, so the linear velocity of the cutting edges would be proportionally slower than those on a larger diameter cutter, but I've no idea whether this is right?

I also wondered if I should use some sort of cutting lubricant (maybe beeswax?) to get best results?

Any advice gratefully received!

Andy


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