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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Accurate Holes in Concrete? (Slightly Bogus Metal Content)
I am going to hang a METAL extension ladder using some METAL hooks. Now
that I have established some serious metal content, I need to drill the mounting holes in the concrete garage wall. The hooks have 3 holes, and I'm going to use plastic expansion anchors for the screws. I have a nice Bosch hammer drill, but my past experience has demonstrated very poor success at getting holes where I want them. The drill wanders & bounces off pieces of agragate in the concrete, and I end up with holes that won't match up with the holes in the bracket/fixture/whatever. I've tried using a star drill as a centerpunch, but that only helps a little. It seems to me that the absolute error gets worse with bigger drills, so I can try starting small and then boring out the hole with a bigger bit. Another option is to drill the first hole, and then use the hooks as a jig to ensure that the subsequent holes line up. I was thinking about using a small bit with a sleeve that fits in the holes in the metal hooks to prevent the drill bit from chewing things up. Any suggestions or tips from the experts out there? Thanks! Doug White |
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did this a month ago in my garage in the concrete block wall.
used a nail to put an indent in the wall then drilled, mounted and reused the nails in the other holes for a spot for the drills worked fine "Doug White" wrote in message ... I am going to hang a METAL extension ladder using some METAL hooks. Now that I have established some serious metal content, I need to drill the mounting holes in the concrete garage wall. The hooks have 3 holes, and I'm going to use plastic expansion anchors for the screws. I have a nice Bosch hammer drill, but my past experience has demonstrated very poor success at getting holes where I want them. The drill wanders & bounces off pieces of agragate in the concrete, and I end up with holes that won't match up with the holes in the bracket/fixture/whatever. I've tried using a star drill as a centerpunch, but that only helps a little. It seems to me that the absolute error gets worse with bigger drills, so I can try starting small and then boring out the hole with a bigger bit. Another option is to drill the first hole, and then use the hooks as a jig to ensure that the subsequent holes line up. I was thinking about using a small bit with a sleeve that fits in the holes in the metal hooks to prevent the drill bit from chewing things up. Any suggestions or tips from the experts out there? Thanks! Doug White |
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It helps to turn the hammer function OFF to start the hole. This keeps the
bit from traveling so much. A steel template to guide the bit would also help. That's a bit of extra work but "it takes what it takes" to get it done right. -- Gary Brady Austin, TX www.powdercoatoven.4t.com "Doug White" wrote in message ... I am going to hang a METAL extension ladder using some METAL hooks. Now that I have established some serious metal content, I need to drill the mounting holes in the concrete garage wall. The hooks have 3 holes, and I'm going to use plastic expansion anchors for the screws. I have a nice Bosch hammer drill, but my past experience has demonstrated very poor success at getting holes where I want them. The drill wanders & bounces off pieces of agragate in the concrete, and I end up with holes that won't match up with the holes in the bracket/fixture/whatever. I've tried using a star drill as a centerpunch, but that only helps a little. It seems to me that the absolute error gets worse with bigger drills, so I can try starting small and then boring out the hole with a bigger bit. Another option is to drill the first hole, and then use the hooks as a jig to ensure that the subsequent holes line up. I was thinking about using a small bit with a sleeve that fits in the holes in the metal hooks to prevent the drill bit from chewing things up. Any suggestions or tips from the experts out there? Thanks! Doug White |
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I am going to hang a METAL extension ladder using some METAL hooks. Now
that I have established some serious metal content, I need to drill the mounting holes in the concrete garage wall. The hooks have 3 holes, and I'm going to use plastic expansion anchors for the screws. I have a nice Bosch hammer drill, but my past experience has demonstrated very poor success at getting holes where I want them. The drill wanders & bounces off pieces of agragate in the concrete, and I end up with holes that won't match up with the holes in the bracket/fixture/whatever. I've tried using a star drill as a centerpunch, but that only helps a little. It seems to me that the absolute error gets worse with bigger drills, so I can try starting small and then boring out the hole with a bigger bit. Another option is to drill the first hole, and then use the hooks as a jig to ensure that the subsequent holes line up. I was thinking about using a small bit with a sleeve that fits in the holes in the metal hooks to prevent the drill bit from chewing things up. Any suggestions or tips from the experts out there? Thanks! Doug White Starting with a small bit - *and light pressure* should get you the accuracy you need. Lots of people really lay into the drill when using a hammer drill - and it's not necessary. If these brackets are pretty much going to be permanent - you could always use a "bang stick" and anchor them to the wall - just not easy to remove if you have to. Ken. |
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"Doug White" wrote in message ... I am going to hang a METAL extension ladder using some METAL hooks. Now that I have established some serious metal content, I need to drill the mounting holes in the concrete garage wall. The hooks have 3 holes, and I'm going to use plastic expansion anchors for the screws. I have a nice Bosch hammer drill, but my past experience has demonstrated very poor success at getting holes where I want them. The drill wanders & bounces off pieces of agragate in the concrete, and I end up with holes that won't match up with the holes in the bracket/fixture/whatever. I've tried using a star drill as a centerpunch, but that only helps a little. It seems to me that the absolute error gets worse with bigger drills, so I can try starting small and then boring out the hole with a bigger bit. Another option is to drill the first hole, and then use the hooks as a jig to ensure that the subsequent holes line up. I was thinking about using a small bit with a sleeve that fits in the holes in the metal hooks to prevent the drill bit from chewing things up. Any suggestions or tips from the experts out there? Thanks! Doug White Use a small rotohammer instead of a hammer drill. I had a Milwaukee, and it was so sweet. There is something about the percussion that is different than a hammer drill. You don't have to get a big monster that is hard to hold up there vertical. They are made in smaller sizes. It might help to drill a small diameter pilot hole, too. A rotohammer is as much better than a hammer drill as is a hammer drill is to a regular drill. Steve |
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"Doug White" wrote in message ... I am going to hang a METAL extension ladder using some METAL hooks. Now that I have established some serious metal content, I need to drill the mounting holes in the concrete garage wall. The hooks have 3 holes, and I'm going to use plastic expansion anchors for the screws. I have a nice Bosch hammer drill, but my past experience has demonstrated very poor success at getting holes where I want them. The drill wanders & bounces off pieces of agragate in the concrete, and I end up with holes that won't match up with the holes in the bracket/fixture/whatever. I've tried using a star drill as a centerpunch, but that only helps a little. It seems to me that the absolute error gets worse with bigger drills, so I can try starting small and then boring out the hole with a bigger bit. Another option is to drill the first hole, and then use the hooks as a jig to ensure that the subsequent holes line up. I was thinking about using a small bit with a sleeve that fits in the holes in the metal hooks to prevent the drill bit from chewing things up. Any suggestions or tips from the experts out there? Thanks! Doug White PS: I would use sleeve anchors rather than the plastic thinguses. Drill your holes deep enough so if you want to abandon the bracket, you can pound them in and put some concrete patch in the hole. Steve Steve |
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My trick with stuff like this is to just drill big and fill the hole with
epoxy to fix the oversized hole and get the fitting where I really want it to be. The cheap and dirty is to drill the holes in the part to be mounted later. -- Bob May Losing weight is easy! If you ever want to lose weight, eat and drink less. Works every time it is tried! |
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Doug White wrote:
I am going to hang a METAL extension ladder using some METAL hooks. Now that I have established some serious metal content, I need to drill the mounting holes in the concrete garage wall. The hooks have 3 holes, and I'm going to use plastic expansion anchors for the screws. I have a nice Bosch hammer drill, but my past experience has demonstrated very poor success at getting holes where I want them. The drill wanders & bounces off pieces of agragate in the concrete, and I end up with holes that won't match up with the holes in the bracket/fixture/whatever. I've tried using a star drill as a centerpunch, but that only helps a little. I made a center punch by welding a blob of #6 Stellite ont the end of a piece of rebar and machining (carbite cutter) an appropriately shaped point. I've center punched quite a number of starters in concrete with this. For just three holes, a piece of drill rod hardened and tempered should do. Those plastic thingies are junk. Epoxy a piece of threaded rod into slightly oversize holes (e.g. 9/16" hole for 1/2" threaded rod). This is far stronger (and cheaper) than expansion fittings. Ted |
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If it really really concrete, use Powers brand Wedge Bolts:
http://www.powers.com/product_07246.html These require a special high tolerance drill bit for the lead hole and suggest an impact gun for installation. Excellent anchor. Pull out values he http://www.powers.com/pdfs/approvals...-Bolt-2001.pdf ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Keep the whole world singing . . . . DanG (remove the sevens) "Doug White" wrote in message ... I am going to hang a METAL extension ladder using some METAL hooks. Now that I have established some serious metal content, I need to drill the mounting holes in the concrete garage wall. The hooks have 3 holes, and I'm going to use plastic expansion anchors for the screws. I have a nice Bosch hammer drill, but my past experience has demonstrated very poor success at getting holes where I want them. The drill wanders & bounces off pieces of agragate in the concrete, and I end up with holes that won't match up with the holes in the bracket/fixture/whatever. I've tried using a star drill as a centerpunch, but that only helps a little. It seems to me that the absolute error gets worse with bigger drills, so I can try starting small and then boring out the hole with a bigger bit. Another option is to drill the first hole, and then use the hooks as a jig to ensure that the subsequent holes line up. I was thinking about using a small bit with a sleeve that fits in the holes in the metal hooks to prevent the drill bit from chewing things up. Any suggestions or tips from the experts out there? Thanks! Doug White |
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