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Old 03-12-2012, 03:41 PM   #16
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Best drill bit for old concrete


Thanks PaliBob,

initially depth was a problem, but a new longer bit took care of that. I think it might be a "cleaning" problem. I am using a shop vac to get the dust out, I might just need to work a bit harder on it.

The shop vac might just be pulling dust up the hole, and not all the way out. I will something thinner, and push it down the hole to make sure it is clear.

Thanks again,
Jack

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Originally Posted by PaliBob View Post
Ultracon screws are almost the same as the more commonly known Tapcons but they have an impressive history.
http://www.tannerbolt.com/default.as...-ultra-con.htm

It sounds to me that you are not drilling the holes deep enough, or the holes are not being cleaned enough.
From the TapCon Site: Ref http://www.concretescrews.com/tapcon-questions.aspx

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Old 03-12-2012, 04:31 PM   #17
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....I think it might be a "cleaning" problem....
Make a depth gauge with an unsharpened pencil with a blue masking tape marker to indicate hole depth.
Any powder residue should show up on the depth gauge.
Another thing you can do is use a small diameter funnel taped to the end of the vacuum hose.
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Old 03-12-2012, 08:21 PM   #18
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Funnel is a great idea.

I picked up the Chicago rotary hammer tonight, will give it a try tomorrow. Too late now and the kids are in bed.

I was hoping to find an sds driver bit to drive the ultracons too, but did not see one at lowes or online.

Has anyone seen another manufacturer that makes these:
http://www.toolstop.co.uk/makita-p-6...adapter-p14735

Thanks,
Jack
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Old 03-14-2012, 12:52 AM   #19
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nobody's house conc is that hard because no contractor or homeowner would spend the $ necessary to make it so,,, more than likely you're running into superhard coarse aggregate & it may be a dense mix of aggregate/cement paste - that's all conc is - cement, water, fine aggregate ( sand ), & coarse aggregate ( crushed rock ).

let me echo the ' chicago ' brand from whereever - its junk however it may last long enough to finish your work. IF it has the jacobs chuck, don't expect much - either spline, sds, or sds improved are necessary for your work - smooth bits are impossible to tighten in the chuck when subjected to the hammer vibration.

have you considered sinusoidal anchors instead ? much faster
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Old 03-14-2012, 09:10 AM   #20
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The Chicago drill seems to be much better, goes through the concrete like wood. I did snap a bit after 20 or so holes though. It has an SDS plus chuck, which is so much easier to work with, I was tightening drill bits every five minutes with the hammer drill.

I agree that you get what you pay for with power tools, but budget was a priority on this one. K just won't use it much after this part of the project. It was cheaper than renting.

I am concerned with the broken bit, it was around $5, I might try another brand at lowes. Hopefully it was just a problem with that particular bit.

Jack
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Old 03-14-2012, 09:14 AM   #21
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nobody's house conc is that hard because no contractor or homeowner would spend the $ necessary to make it so,,, more than likely you're running into superhard coarse aggregate & it may be a dense mix of aggregate/cement paste - that's all conc is - cement, water, fine aggregate ( sand ), & coarse aggregate ( crushed rock ).

let me echo the ' chicago ' brand from whereever - its junk however it may last long enough to finish your work. IF it has the jacobs chuck, don't expect much - either spline, sds, or sds improved are necessary for your work - smooth bits are impossible to tighten in the chuck when subjected to the hammer vibration.

have you considered sinusoidal anchors instead ? much faster
I will have to research the anchors, but I have 400 ultra cons now. The drill makes it much more doable. I got a full 4 by 8 screwed down last night in half the time it took to fasten 2 screws previously.

Jack
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Old 03-14-2012, 03:33 PM   #22
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I did not understand that reference to "sinusoidal anchors" in post #19
Nor did Google point me to any suppliers that would help in your application.

In my location I had not seen the Ultracon brand masonry screws but their web site shows an impressive history:
http://www.tannerbolt.com/default.as...-ultra-con.htm
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Old 03-14-2012, 04:27 PM   #23
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Same here on the anchors.

As for ultracons, there seem to be the same quality level as tapcons and they are a lot cheaper.

Jack

Quote:
Originally Posted by PaliBob View Post
I did not understand that reference to "sinusoidal anchors" in post #19
Nor did Google point me to any suppliers that would help in your application.

In my location I had not seen the Ultracon brand masonry screws but their web site shows an impressive history:
http://www.tannerbolt.com/default.as...-ultra-con.htm
.

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