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Cutting Tball and button holes in Metal CP?

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Crayola:
So I need to add a few button holes and a 2 1/4" trackball
hole to a metal control panel. Any suggestions on how to do this?

Would a hole saw work? I havent had good luck with hole saws
and metal. They tend to wander until they bite in. Usually where I
dont want it to:(

Crayola

JustMichael:
Greenlee hole punches make nice holes.

Crayola:
Got a good source for them? They seem kinda expensive.

Crayola

JustMichael:

--- Quote from: Crayola on October 09, 2010, 11:36:04 pm ---Got a good source for them? They seem kinda expensive.

Crayola

--- End quote ---

Sorry no I don't.  Also I have no idea what size for the trackball. You could find out how much a local machine shop would charge to punch the holes for you. 

bkenobi:
You can use a hole saw or step drill for the buttons, but the trackball will be more complicated.  Are you planning on having a bezel of some kind around it?  If so, you can probably cut it with a hack saw and file it down to the final dimensions.  If the edge will be exposed, I'd get a machine shop to do it for you.

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