In article ,
Smitty wrote:

When I get to my panel, which isn't going to be soon, I'll probably do
it on the mill. But for those who don't have access to a machine shop, I
wonder why you're talking about hole saws and fly cutters. Don't the
Greenlee type punches work pretty well? You only need a small pilot hole
and a couple of wrenches.

I much prefer the fly cutter, as the Greenlee punches take a lot of
torque and may leave the panel warped in places.

If you turn the fly cutter slow enough and use a good aluminum cutting
fluid, it works well and safely.

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