In article , Rileyesi says...

I need to make some 4-11/16 inch holes in an aluminum instrument panel.

If you can afford to do this, send it out to sombody who has
an NC milling machine. A 3/8 inch diameter end mill will
walk around that circle in short order. They can also do
the other holes as well, including putting in D-shaped
holes so the various fuse holders and connectors don't
spin.

The 6061 really is **** to work with, gummy has hell. At
one time Bud would sell 2024T6 panels which are a pleasure
to machine.

Jim

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