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Old 06-05-2018, 05:32 PM   #1
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Sheet Metal Hole Drill Bit?????

What is the best and easiest 2 1/2 inch Sheet Metal Hole Drill Bit. I have to drill a vent pipe through the bus floor and ceiling and the regular hole saw bits take me 2 hours to drill one hole. I need your help with what drill bit will do this faster.

Thank you
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Old 06-05-2018, 06:07 PM   #2
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You need a hole saw. They fit in a drill and can cut through metal, although it will be a bit noisy.
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Old 06-05-2018, 06:10 PM   #3
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I have used https://www.homedepot.com/p/Diablo-2...500C/206797332

Along with a Harbor Freight 1/2" corded drill with good success.

On heavier material I used a cutting lubricant as well.
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Old 06-05-2018, 06:29 PM   #4
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2-1/2" holesaw
What regular holesaw bits have you been using?
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Old 06-05-2018, 08:23 PM   #5
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Quote:
Originally Posted by PNW_Steve View Post

Along with a Harbor Freight 1/2" corded drill with good success.
Chicago Electric?

I bought one of those and a 2" Lenox hole saw bit to cut a hole in the floor......first time it caught an edge, it broke out the threads for the handle stud. Moved the handle to the other side. The second time it caught, it snapped the handle off in my hand. The third time it caught, it broke the internal shaft.

Took it back to HF, got another. This time I was drilling a 3/8" hole. First time it caught, it snapped the handle off. So I Loctited a 4" bolt to use as a handle, and it's been fine since then.

The only reason I bought it was to take some of the stress off my 20-yr-old Black & Decker, which just keeps marching right along.
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Old 06-22-2018, 07:11 PM   #6
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Originally Posted by PNW_Steve View Post
I have used https://www.homedepot.com/p/Diablo-2...500C/206797332

Along with a Harbor Freight 1/2" corded drill with good success.

On heavier material I used a cutting lubricant as well.
Agreed! I picked up a 2.5" and a 4" Diablo hole saw with their proprietary quick connect system as well a few months ago. I can vouch that these bits work great on cutting through the bus' floor and roof very easily. About 1-3 minutes per cut taking my time and trying to take about as close to 800 rpms as I could guesstimate.

Very clean buts with not barbs or sharp edges.
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Old 08-03-2018, 04:13 PM   #7
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Originally Posted by CaptSquid View Post
You need a hole saw. They fit in a drill and can cut through metal, although it will be a bit noisy.
I agree squid I've got a set of Milwaukee's but keep your drill speed down or buy a dozen extra pilot bits. Also feed slow and grip it well.
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Old 08-03-2018, 04:16 PM   #8
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I agree squid I've got a set of Milwaukee's but keep your drill speed down or buy a dozen extra pilot bits. Also feed slow and grip it well.
Also get a set of carbide burrs use to clean rough edges if your piping through sheet metal buy some rubber hose and a tune of 3M adhesive plot the hose lengthwise and line the hole with it to silence the pipe and protect the pipe.
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Old 08-03-2018, 05:02 PM   #9
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[QUOTE=golfersmurf57 buy a dozen extra pilot bits. Also feed slow and grip it well.[/QUOTE]
My trick is do not drill the pilot hole with the holesaw. Use a 1/8 bit followed by a 1/4 inch bit then lube and the hole saw. Use the same trick for uni bits too.
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Old 08-03-2018, 06:31 PM   #10
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2 hours?!

Okay, That strikes me as unusual. I would assume ten minutes... I am curious are you using some thing that looks like this?
Alfa Tools 1-3/8" Cobalt Bi-Metal Hole Saw - IMS Bolt

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