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-   -   concrete bits - question (http://www.diychatroom.com/f19/concrete-bits-question-164468/)

Mark Harvey 11-23-2012 06:54 PM

concrete bits - question
 
I am drilling into a very old foundation and the standard concrete bits don't do anything. I'm using a hammer drill and the bits are from HomeDepot. I think they would do fine on brick and cment blocks but the foundation is solid. Any suggestions?

joecaption 11-23-2012 07:01 PM

Sure the drills running in the right direction?
Unless I'm hitting a stone in concrete I've never had on not work.
What size hole?
What drill are you trying to use?

Mark Harvey 11-23-2012 07:06 PM

drill bits
 
I'm using a Dewalt 1/2" also I have a local brand Mastercraft hammardrill. The hole size is 3/16. I agree I may be hitting a rock but I would think it would shatter after a while.

oh'mike 11-23-2012 07:27 PM

Try Bosch masonry bits---they are the best ones you will find without going to a specialty house---

I use them all the time and go through some tough materials----

princelake 11-23-2012 08:32 PM

if the bosch bits dont work get yourself the hilti rotary hammer drill bits and just put it in the chuck of your regular hammer drill.

user1007 11-24-2012 04:12 PM

Sounds like you need something like the bits mentioned. Your real tool supplier will have carbide and diamond tipped masonry bits. Might be worth it since 3/16" is a size you will use a lot I suspect.

Are you able to get into the surface at all. If so, are you sure you are not hitting steel rebar, plate or something as you go? A masonry bit will not help much with that!

Thurman 11-24-2012 05:16 PM

"using bits from Home Depot". Home Depot sells a number of brands of so-called "masonry bits". A good, known brand, such as the Bosch mentioned may be the answer to your problem. Now--is the DeWalt 1/2" drill a "hammer drill"? I'm not familiar with the Mastercraft, so I can't judge it. You will need (can we say "must have") a good hammerdrill to do this job. I have drilled into a lot of old concrete and I don't know whether it was because of it's age or mix back then, but they are harder than today's concrete. 1) A good, brand name, carbide tipped masonry bit, and 2) a good, preferably brand name, hammer drill should drill into this concrete. Granted that a stone or re-bar will make the job harder. Someone with experience can tell if they are hitting a stone or a metal re-bar, but both can be drilled through with the proper tools and procedure.

Mark Harvey 11-24-2012 07:34 PM

bits
 
Great advice from all. The tool I mentioned "Mastercraft" is from a company called Canadian Tire. I din't think they have entered the U.S. market but I'm sure you have similar companies. They aren't bad, but I consider their tools to be mostly throw away after use. I may have to invest in a good hammer drill ... Bosch, Dewalt, etc. but as my use for a hammer drill is limited, it's one of those investments to think about.

woodworkbykirk 11-24-2012 11:02 PM

hte mastercraft tools hes talking about are known as kobalt in the u.s

come from the same manufacturere im pretty sure just get a differnt brand tag

stadry 11-25-2012 08:24 AM

NEVER use a rotary-hammer / hammer-drill w/diamond bits UNLESS you have deep pockets - you'll destroy them in a heartbeat,,, we routinely use apron / vest store 3/8" carbide bits w/sds chuck for epoxy crack injection - never any troubles - they're cheap & we can always find an apron / vest store for more :thumbsup:

jomama45 11-25-2012 10:28 AM

Heck, I've never even heard of a "diamond masonry bit", other than core bits that would fit in a huge core rig. I highly doubt you're going to find a diamond core bit at 3/16" though...........:whistling2:

As others said above, buy a decent carbide tipped SDS bit, and carefully chuck it into you're drill. It may take a few times tweeking the orientation in the chuck to keep it from wobbling.

user1007 11-25-2012 11:42 AM

Quote:

Originally Posted by jomama45 (Post 1059905)
Heck, I've never even heard of a "diamond masonry bit", other than core bits that would fit in a huge core rig. I highly doubt you're going to find a diamond core bit at 3/16" though...........:whistling2:

I have one 1/4"d. It is a core bit but fits a standard drill chuck.

jomama45 11-25-2012 12:02 PM

Quote:

Originally Posted by sdsester (Post 1059972)
I have one 1/4"d. It is a core bit but fits a standard drill chuck.

I'd LOVE to see a picture of a 1/4" diameter diamond core bit...............:whistling2:

user1007 11-25-2012 12:18 PM

Quote:

Originally Posted by jomama45 (Post 1059975)
I'd LOVE to see a picture of a 1/4" diameter diamond core bit...............:whistling2:

They are sold as masonry, concrete and tile bits. I have used mine mainly for drilling into masonry and concrete to fit anchors for hanging art. Has always worked flawlessly. I see there is a 3/16" bit for about $15.

http://dewalt.com/tool-parts/drillin...tile-bits.aspx

oh'mike 11-25-2012 01:04 PM

Look on E-bay I use a lot of 1/4" hollow diamond bits-----I get them from Hong Kong for about $15.00 a dozen.

Use them for drilling porcelain tile.


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