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School me on Hammer-Drills / Roto-Hammers
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<blockquote data-quote="mark" data-source="post: 1448000" data-attributes="member: 16354"><p>You need a roto-hammer, not a "hammer drill". Hammer drills are things like an 18V Dewalt cordless that has a hammer setting to do small holes in masonry or the like.</p><p></p><p>A Roto-Hammer is like a Bocsh, Makita or Hilti special purpose tool specifically designed for drilling holes in concrete and other hard surfaces. Same hammer and rotation as a hammer drill, but more powerful and better at the job.</p><p></p><p>The most common (and cheapest) roto-hammer is the smaller "7/8" ones, Bocsh Bulldog is a very common and popular model. They say they are good to 7/8" diameter, but really up to 1/2" with any regularity. For a 7/8" I'd go up a size. Bigger tool, better at the job.</p><p></p><p>Easiest is to just rent one from HomeDepot or the like, with the correct sized bit. Have everything laid out and ready, pick it up, drill your holes and get it back in the 4-hr minimum. </p><p></p><p>For anchors, sounds like you already have them in mind but get the "drop-in and set" kind. Not as cheap and you'll have to get a setting tool as well, but will leave you a nice, flush floor. Over time they will fill up with dust and crap, but just use a screwdriver and shop vac, then shop air to blow them out.</p><p></p><p>Where are you located?</p></blockquote><p></p>
[QUOTE="mark, post: 1448000, member: 16354"] You need a roto-hammer, not a "hammer drill". Hammer drills are things like an 18V Dewalt cordless that has a hammer setting to do small holes in masonry or the like. A Roto-Hammer is like a Bocsh, Makita or Hilti special purpose tool specifically designed for drilling holes in concrete and other hard surfaces. Same hammer and rotation as a hammer drill, but more powerful and better at the job. The most common (and cheapest) roto-hammer is the smaller "7/8" ones, Bocsh Bulldog is a very common and popular model. They say they are good to 7/8" diameter, but really up to 1/2" with any regularity. For a 7/8" I'd go up a size. Bigger tool, better at the job. Easiest is to just rent one from HomeDepot or the like, with the correct sized bit. Have everything laid out and ready, pick it up, drill your holes and get it back in the 4-hr minimum. For anchors, sounds like you already have them in mind but get the "drop-in and set" kind. Not as cheap and you'll have to get a setting tool as well, but will leave you a nice, flush floor. Over time they will fill up with dust and crap, but just use a screwdriver and shop vac, then shop air to blow them out. Where are you located? [/QUOTE]
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