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Old 10-09-2012, 06:13 PM   #16
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What is best portable way to Drill holes through 1/2" steel?


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Originally Posted by peakcelln View Post
Sounds like hiring the local welder for $200(His quote when I called him) may be best.
Five bucks a hole sounds like a deal to me.

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Old 10-09-2012, 06:15 PM   #17
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What is best portable way to Drill holes through 1/2" steel?


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Originally Posted by peakcelln View Post
Well, my partner in all this has had alot of experience in structural Steel framing, drywall, ceiling grid, etc in commercial applications; but not much in plate steel. I was understanding this process to be alot easier then it now appears.
It is easy, when you have the templates to give to the fabricator to make the holes.
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Old 10-09-2012, 06:20 PM   #18
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What is best portable way to Drill holes through 1/2" steel?


Thats funny ddawg16, thats exactly what the welder suggested as something else I could do; but I'd have to buy one, and the bits, and I'd be over $200...But thanx. At least I know the guy knows what he is talking about and is honest.
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Old 10-09-2012, 06:39 PM   #19
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What is best portable way to Drill holes through 1/2" steel?


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It is easy, when you have the templates to give to the fabricator to make the holes.
We were originally going to use the fabricator and he wanted the anchor bolts 7" square, but they were too expensive. Then we were going to cut the steel ourselves, then have this welder put them all together and save about $600.We had allready poured the concrete and thought we could mark the holes on the plates and number them when the welder put them together so it didnt matter if the anchors were exactly right. But the guy selling the steel, didnt have the tube steel he said he had. So, being in a bit of a time crunch, we decided to go back and have the fabricator do them. He actually cut his price a bit and made them affordable(About $125/column). But now, the anchors were not 7" square, so thats why we thought we'd just drill them ourselves.

Quite the mess. Ya live, ya learn...
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Old 10-09-2012, 06:50 PM   #20
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What is best portable way to Drill holes through 1/2" steel?


hind sight is always 20/20.
At $5 per hole I'd hire the guy to drill em for you.
2nd best try to rent one of those portable drill press deals, they are slick seen em in use.
3rd is a 3/4" drill with 1/4,3/8/1/2/5/8 holes, even if you have to rent the drill. There are tricks to drilling square holes with a hand drill.
Use CD as a mirror and drill through center, you'll see when it is off square. Drill a test hole even in wood and you will see what I mean.

Last edited by mae-ling; 10-09-2012 at 07:58 PM.
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Old 10-09-2012, 06:54 PM   #21
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What is best portable way to Drill holes through 1/2" steel?


you can also use a Jancy slugger cutter.



This is the bit


We use this all the time. it is a portable magnetic drill. You also could have had the anchors welded to the underside of the plate.

Last edited by epson; 10-09-2012 at 07:24 PM.
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Old 10-09-2012, 07:49 PM   #22
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What is best portable way to Drill holes through 1/2" steel?


$200 doesn't sound bad-----

I would consider renting a Mag drill if the welder doesn't work out----I've used them plenty of times and they do the job--like Beenthere suggested--use tap oil to cool the bits---

I like the welder idea---
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Old 10-09-2012, 09:26 PM   #23
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What is best portable way to Drill holes through 1/2" steel?


Peak....too bad you don't live close to me....I could loan you one for a day.....

I would check out rental costs......you don't want to do it with a hand drill.....I only had about 20 holes to drill in 1/4" plate steel for my beams....I almost broke my wrists a couple of times when the bit caught.....

Without the mag drill, it took 10-15 min per hole
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Old 10-09-2012, 09:43 PM   #24
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What is best portable way to Drill holes through 1/2" steel?


Ddawg---I used to haul the Mag drill up the side of a mixing tank with a block and tackle just to avoid hand drilling.

The most serious accident in my career ,so far, was caused by a drill,---three broken ribs---three weeks off work.
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Old 10-09-2012, 10:16 PM   #25
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What is best portable way to Drill holes through 1/2" steel?


Although mag drills certainly work well in the right application, gettign one to attach to concrete to concrete through "magnetics" should prove challenging. Unless the OP was able to find one to rent, and it had allowances to be anchored down toe the concrete with mechanical anchors, I doubt it's much use at this point. Plasma is the way to go in this case IMO........
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Old 10-09-2012, 10:46 PM   #26
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What is best portable way to Drill holes through 1/2" steel?


No plasma if it's sitting on concrete. The kerf needs to go somewhere or you'll be buying lots of tips and they're expensive.
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Old 10-10-2012, 07:57 AM   #27
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What is best portable way to Drill holes through 1/2" steel?


I don't believe it's on concrete yet.....as I understand it, he needs to drill the holes to match the studs already in the concrete....so I assume the columns are laying on the ground on their sides....with the plates vertical.....pretty much a perfect application for a mag drill....
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Old 10-10-2012, 08:40 AM   #28
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What is best portable way to Drill holes through 1/2" steel?


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I don't believe it's on concrete yet.....as I understand it, he needs to drill the holes to match the studs already in the concrete....so I assume the columns are laying on the ground on their sides....with the plates vertical.....pretty much a perfect application for a mag drill....
agree
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Old 10-11-2012, 06:23 PM   #29
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What is best portable way to Drill holes through 1/2" steel?


Paid to have the Welder come out and plasma cut them. We also decided to cut the existing anchors and put 5" new ones in using the new marked(And Square) holes the welder made. He obviously had to cut and grind the old ones down so the plate would sit flat...still only charged me the $200. I will be using him again...
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Old 10-11-2012, 06:25 PM   #30
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What is best portable way to Drill holes through 1/2" steel?


Peak....thanks for the update....sounds like a good solution and you got treated very fair.

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