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Post by garystewart on Jul 3, 2011 23:11:33 GMT -5
I put up some new railing and needed to drill 8 holes into old concrete. I started with an 1/8" bit and drilled about 1.5" deep, then switched to 1/4" bit and redrilled. I used a regular drill for the job. Short version---it took 4 new bits and several older ones to get the job done. So what's the trick? Don't have the need to buy an expensive hammer drill, and after reading some reviews, the cheaper ones are a waste of money. Do the hammer drill bits last longer or do they just get the job done quicker?
I suppose I could have tried my .22cal stud driver, sure wish I still had my .38cal one. That would have done the job!
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Post by franz on Jul 4, 2011 11:58:26 GMT -5
Unlike drilling metal, drilling a starter hole in concrete & then upsizing is counterproductive beyond using a small bit to "centerdrill" the concrete.
Beyond that, slow rotation and high pressure get the job done every time.
Carbide drills come in every quality from Drills oatmeal while still mushy to the Cycloimpac I buy for 8 bucks a 1/4" bit. Unless they get lost, stolen or broken they just keep drilling, and can be resharpened when necessary.
Hammerdrill bits are generally a better investment and better grade of carbide for the job.
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Post by markkw on Jul 23, 2011 19:56:17 GMT -5
Buy the two-speed Metabo selectable hammer/drill. Seriously, you need a hammer drill, saves all the time and aggravation - I have a selectable VSR B&D I salvaged from a garbage can, black case with red tikker & hammer selector switch, not even in the same category as Metabo but good nuff for the occasional hole. Use standard shank carbide tipped drills, keep the dust clear and if going deeper than 2" blow the hole with air on a regular basis. Keep that Hilti in the drawer if it's older concrete ... then again, you could set the anchors easier when you pour the new concrete - I've blown chunks trying to push anchors into old mud with my 32 caliber Hilti.
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Post by uliikosuhoce on Jun 14, 2019 14:01:03 GMT -5
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