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Old Nick
 
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Default newbie question - drilling big holes in steel plate

On Sat, 14 Feb 2004 22:07:24 -0500, "Dave in MD"
vaguely proposed a theory
.......and in reply I say!:

I have drilled 1.25" holes in steel on a press using a normal 1.25"
drill bit in the chuck. Works. Not cheap. BUt I had a few to do, and
will have more. However, lots of cooling or cutting compound is a good
idea, along with working up to the size and taking it easy on the
larger holes. My press runs at 200 RPM lowest, and it was pushing it.
I would say 400 RPM is way too fast.

I'd like to drill a 1 5/16" (1.3125 inch) hole in a 1 inch thick mild steel
bar. I only have a drill press in my shop. Is there a way to drill a hole
this big in a home shop, without a milling machine?

It has been suggested I try a HSS hole saw at low RPM (less than 400) with
plenty of cutting fluid.

It doesn't have to be pretty, and the jig I'm making doesn't require super
high precision.

Thanks,
Dave


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