Any machinists in our happy Doper family?

[QUOTE=Cartooniverse]
Hi I’m back. Yes, it’s aluminum. Weight is an issue with stuff I make, and have made.

Sadly it IS 1" thick stock and the arc/slot will be either 1/4 inch or 5/16 inch.

This is not do-able? Or, we’ll break a lot of bits but it can be done?
[/QUOTE]

Hippy pretty much nailed it. I’ll add that the odds of breaking a cutter are slight unless the arcs are tight (think rapid heartbeat on a moniter). Generally, you really have to work at it to break a cutter in aluminum (Pete Puma managed to do it quite often, however.).