What caliber for concrete?

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Jered
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What caliber for concrete?

Postby Jered » Wed Mar 22, 2017 3:28 am

drill bit.jpg


So, I was drilling some concrete today to try and screw down the rail on my patio. I...umm...failed.

That's bit is a Bosch concrete bit...it didn't survive my 60 year old concrete. I was using a Makita hammer drill, and made it less than 1/2 inch into the concrete. In case you can't tell from the picture, that bit is ground flat.
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Steamforger
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Re: What caliber for concrete?

Postby Steamforger » Wed Mar 22, 2017 4:10 am

The AF dallied with a gunpod for the F-16 called the GPU-5 which contained a GAU-13 cannon. The story is it damn near shook the F-16 to pieces and they were difficult to keep zeroed.

The AF surplused them all to the USMC.

The USMC loaned some to the Navy, who containerized them and thought they could probably get 4 containers into the deck of an LCAC. The idea is these LCACs would approach heavy obstacles on the beach and turn them into rubble. It was, according to the article in All Hands, effective. Never heard much about it again after that.

So, the proper answer would be 30mm. :twisted:

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Re: What caliber for concrete?

Postby Jered » Wed Mar 22, 2017 4:40 am

I'd like to have some concrete left. :P
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Re: What caliber for concrete?

Postby slowpoke » Wed Mar 22, 2017 5:35 am

Winchester ringblaster in 8guage is the correct round for concrete
http://winchesterindustrial.com/equipment.html
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Re: What caliber for concrete?

Postby Jered » Wed Mar 22, 2017 6:36 am

I want to have some concrete left. :lol:
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Re: What caliber for concrete?

Postby Old Grafton » Wed Mar 22, 2017 1:14 pm

I think the silver solder holding the carbide tip failed. Looks like the bit got really hot; I'm guessing the hammerdrill broke the carbide away from the bit and then the steel shank tried it's damndest to drill thru carbide, which won't happen. Unless you're sure you dug the carbide out of the hole I'd say a new bit, a new location of the hole, and less pressure on the hammerdrill, allowing the bit some lineal room to work. YMMV
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Re: What caliber for concrete?

Postby Cobar » Wed Mar 22, 2017 4:08 pm

Old Grafton wrote:I think the silver solder holding the carbide tip failed. Looks like the bit got really hot; I'm guessing the hammerdrill broke the carbide away from the bit and then the steel shank tried it's damndest to drill thru carbide, which won't happen. Unless you're sure you dug the carbide out of the hole I'd say a new bit, a new location of the hole, and less pressure on the hammerdrill, allowing the bit some lineal room to work. YMMV


+1

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Re: What caliber for concrete?

Postby Weetabix » Wed Mar 22, 2017 5:55 pm

Did you hit rebar, or should that bit have taken care of that? I've wrecked a bit on a direct rebar hit before.
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Re: What caliber for concrete?

Postby Denis » Wed Mar 22, 2017 6:46 pm

slowpoke wrote:Winchester ringblaster in 8 gauge...
http://winchesterindustrial.com/equipment.html


Curses. Now I need one of those!

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Re: What caliber for concrete?

Postby Jered » Wed Mar 22, 2017 8:53 pm

I bought myself a concrete nailgun that should be here in a couple of days. Maybe that will work. 8-)

It's not a project without a new tool.
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Re: What caliber for concrete?

Postby slowpoke » Thu Mar 23, 2017 12:18 am

Denis wrote:
slowpoke wrote:Winchester ringblaster in 8 gauge...
http://winchesterindustrial.com/equipment.html


Curses. Now I need one of those!

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Re: What caliber for concrete?

Postby Weetabix » Thu Mar 23, 2017 5:24 pm

slowpoke wrote:Winchester ringblaster in 8guage is the correct round for concrete
http://winchesterindustrial.com/equipment.html

Should have a belt-fed option.
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Re: What caliber for concrete?

Postby MiddleAgedKen » Fri Mar 24, 2017 1:18 am

I wore out a couple of masonry bits on 1928-vintage concrete in about 2000 or so, when my older son was toddling and I decided lagging the bookcase to the basement floor would be a good idea.
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Re: What caliber for concrete?

Postby slowpoke » Fri Mar 24, 2017 4:04 am

Weetabix wrote:
slowpoke wrote:Winchester ringblaster in 8guage is the correct round for concrete
http://winchesterindustrial.com/equipment.html

Should have a belt-fed option.

They used to have a hopper feed iirc.
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Re: What caliber for concrete?

Postby Windy Wilson » Fri Mar 24, 2017 9:37 pm

MiddleAgedKen wrote:I wore out a couple of masonry bits on 1928-vintage concrete in about 2000 or so, when my older son was toddling and I decided lagging the bookcase to the basement floor would be a good idea.


I think old concrete is harder than the new stuff.
What about bolts that are fastened using some kind of .22 cal blank that shoots the mounting points into the concrete? Something similar was used in our Boy Scout meeting room back in the early 70's, so maybe the technology is mature and the equipment cheap.
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Re: What caliber for concrete?

Postby HTRN » Fri Mar 24, 2017 10:37 pm

The answer is simple 27 caliber powder nailer. :ugeek: :mrgreen:
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Re: What caliber for concrete?

Postby MiddleAgedKen » Sat Mar 25, 2017 2:54 am

The word on concrete is that the older it is, the harder it gets. That was one of the selling points of ferrocement-hulled boats.

To be fair, if the hull was poured properly, it's hellishly strong stuff. If you don't pour it right, though, water gets to the wire armature, the hull starts weeping rust, and one fine day (well, someone might consider a full gale fine) your boat crumbles.
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Re: What caliber for concrete?

Postby Rich Jordan » Sat Mar 25, 2017 6:37 pm

slowpoke wrote:Winchester ringblaster in 8guage is the correct round for concrete
http://winchesterindustrial.com/equipment.html


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"Use Winchester Industrial Tools and loads to remove Snow Men or Christmas Tree material build-up problems" (1)

I want one too...


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Re: What caliber for concrete?

Postby Cybrludite » Sat Mar 25, 2017 9:50 pm

Hmmn, I'm thinking the lighter one with the frangible iron slugs would be one hell of a door knocker...
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Re: What caliber for concrete?

Postby Weetabix » Sat Mar 25, 2017 11:51 pm

MiddleAgedKen wrote:The word on concrete is that the older it is, the harder it gets.

This is true.
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Re: What caliber for concrete?

Postby Jericho941 » Mon Mar 27, 2017 4:22 am

Cobar wrote:
Old Grafton wrote:I think the silver solder holding the carbide tip failed. Looks like the bit got really hot; I'm guessing the hammerdrill broke the carbide away from the bit and then the steel shank tried it's damndest to drill thru carbide, which won't happen. Unless you're sure you dug the carbide out of the hole I'd say a new bit, a new location of the hole, and less pressure on the hammerdrill, allowing the bit some lineal room to work. YMMV


+1


Agreed. Really, the art of drilling concrete takes practice. I was fortunate in that the last time I had to do that, I had a lot of government property to play with. :lol:


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