I want to drill a 1.25" hole in a sheet of (probably) 12ga stainless
steel. I'm not sure of the grade but it's the type commonly used for
commercial (restaurant) range hoods and tables.
How do I go about this? Hole saw? Carbide tipped? 3/8 electric drill?
Do I need to use a drill press? Slow speed? High speed? Water cooled?
Alloy is probly 304 or 316 series.
I would probly use a drill press with a hole saw--a good one--no junk, use
High Speed Steel ( HSS ), and run at a fairly slow spindle speed (~100 /
200 rpms) using sulphur oil.
Running too many rpms in stainless will burn up a hole saw pronto, with
resultant work hardening of the nickel in the stainless alloy.
An easier way might be to just take it to an electrical contractors shop and
have them do this using a knockout punch.
This is Turtle.
Go by any Auto body shop repair shop and have them cut the hole for you with
their Plasa cuttier. They use it to cut finders off to just replace parts of
them or cut out slots to make the fenders fit. Just mark out the hole with a
line to cut on and he will pop it out of there in about 30 seconds. It will not
heat up the metal at all to leave hot metal stains or discolorations at all.
$10.00 and a thank you will usely Get-R-Done.
And no you don't need one for a good one will run you about $300.00 or more.
Outgoing mail is certified Virus Free.
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I don't know much about stainless steel. I've used chassis punches on
1/8" aluminum and thin steel. Here's one on Ebay, but do the research
to find out if it's adequate for your material.
If it's OK the only other things you'll need are a (big) adjustable
wrench and a way to immobilize your work.
You say you want to drill "a hole".
For this I would use a hole saw, turning slowly and cooled with oil.
If you want to drill a bunch of holes it might be worth investing in a
carbide tipped hole saw.
Stainless is bad about retaining heat and most drill presses turn too
fast for this size of hole.
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