I need to drill some 11/32" holes in a concrete floor. I have a 1/2" drive craftsman drill. Will this be enough or do I need to get a hammer drill or some other type of big drill?

10/17/2008 1:27:01 PM

there's one really good way to find out..

personally I think it'd probably be fine for a hole that small. give it a shot

10/17/2008 1:27:46 PM

Hell, money says that a 1/2" drill will do ya fine. I drilled 3/8" holes in concrete using a good concrete bit and a 3/8" Craftsman drill that's about 3/4 as old as I am.

10/17/2008 1:31:38 PM

get the right drill bit. GTG.

10/17/2008 1:35:54 PM

actually its 11/16" hole.. something i read online said that a normal drill could end up chipping the concrete, making the hole bigger. does anyone have a hammer drill they would loan out for some beer money?

10/17/2008 2:17:08 PM

Mark...what are you drilling the holes for? for a standard concrete anchor or lag bolt, then it's really not that crucial if there's an odd chip or such. How deep do you need to go? The biggest pain is if the concrete has aggregates in it (and that's the basic definition of concrete: portland cement mixed with aggregate, or stone) because it doesn't drill nearly as easily as straight cement does.

Unless it's for an ultra precise hole, I don't see any need to bother.

10/17/2008 3:02:54 PM

Dropping these guys in a concrete floor in order to bolt down computer racks

http://www.computercablestore.com/PDF/ICCMSRFLKT.pdf

min hole depth 1 5/8"

10/17/2008 3:17:17 PM

not a problem. Go at it! Regular old concrete anchors.

10/17/2008 3:21:26 PM

I too need to drill through concrete. Anyone got a suggestion on a really long bit? It's probably a 1.5' thick chunk that I'm going to use as a permanent anchor point near my pier for guest boats.

10/17/2008 3:41:27 PM

why don't you sink a 4" or 6" anchor in it and be done with it? I guarantee nothing short of a 40' Hatteras would pull it out.

10/17/2008 3:58:13 PM

You mean like an eye bolt? What's the best way to anchor the anchor? This is a huge block of concrete that has already been poured.

10/17/2008 4:10:18 PM

weld the eye to a peice of 3/8 plate with 4 holes. bolt the plate to the concrete with 4 anchors.

10/17/2008 4:12:14 PM

there are two ways to do it, you can use an insert that expands when you thread a bolt in it or there are epoxy tubes( look like glow sticks) that you put in the hole and then drive your fastener in, breaking the tube and mixing the epoxy. I have never used the epoxy stuff but know that the expansion shields are buck as hell, combine that with ^ and you have what you need. use stainless bolts, the shields are not iron so they shouldnt rust. Wilders fasteners ftw in Raleigh

[Edited on October 17, 2008 at 4:46 PM. Reason : wilders]

10/17/2008 4:45:49 PM

I'll have to look for some of these anchors. Never really thought about doing it that way.

10/17/2008 4:57:40 PM

We've got a hammer drill at work and some 2' long bits, but that sonambitch will break your arm if it decides to bind up.

Try a regular drill, if the concrete is fresh(< a couple years old), it might work.

10/17/2008 8:12:27 PM

practice on some out of the way spot first.

10/17/2008 8:51:40 PM

what if the concrete is 40+ years old?

10/17/2008 10:09:09 PM

Hire someone else.

10/17/2008 10:21:19 PM

vertically oriented expansion anchors in concrete + water exposure = sure fire disaster. Go to the hilti webpage, look up the load tables for their epoxy. My guess is 7/8" anchors with 6-8" embed if you are going to tie up a boat and want it to stay.

10/18/2008 8:24:43 AM

i don't use anything but ramset/red head products. they're a little pricey, but worth it in my opinion for the quality and the variety of stuff they offer. http://www.ramset-redhead.com/

10/18/2008 11:18:14 AM

It will be fine.

[Edited on October 18, 2008 at 11:18 PM. Reason : huihuiguikgtuytfr5u6fduikhiojku9877t54e765d]

10/18/2008 11:17:53 PM