Re: Hammer-Drill Technique?



"Doug White" <gwhite@xxxxxxxxxxxx> wrote in message
news:fb-dnYqwWNeEvxTeRVn-jg@xxxxxxxxxx
>I need to drill a large number of holes in my poured concrete garage
> walls to put up some adjustable metal shelf "standards" (rails). The
> rails are a u-chennel with slots for the actual shelf brackets, and have
> 5 countersunk holes spaced along them. I made a drill guide that ensures
> that once the ends are in place, the holes for the screw anchors will be
> located accurately. I have a 1/2" Bosch hammer drill to drill the holes,
> with the appropriate carbide tip drills.
>
> This all works OK, but on a couple of the rails, the ends drilled OK, but
> I'm hitting aggragate or something very hard on the inboard holes. It
> takes forever (~5 minutes of steady drilling for 1/16" of progress) to
> make a hole. My hands are getting numb from the constant pounding.
> Somewhere I have some anti-vibration gloves for my old lawnmower, and I
> really need to find them.
>
> What I'm wondeirng is what's the most efficient way to use a hammer
> drill. Is it best to let it chip away slowly at things & just be
> patient, or will really leaning on it help? There are a couple of
> "operating points" for the thing. Too little pressure, and it doesn't
> hammer at all. A little more pressure, and it start buzzing, but it
> isn't recoiling too badly. I could drill comfortably at that level for
> a long time. If you lean on it a bit harder when it's hit something
> hard, every time it hammers, it hammers on my hand as much (if not more)
> than on the hole. Aside from the pounding on my hands, I don't know if
> leaning on the thing is going to destroy my drills prematurely. When I'm
> drilling the top end holes without a guide, I know that if I use too much
> pressure the drill tends to wander more, but with the guide, that's not
> an issue.
>
> I've got 4 tough holes in partial levels of depth, and another 5 to
> start. The good news is that I've got 8 holes finished. Any suggestions
> would be really appreciated.
>
> Thanks!
>
> Doug White

Hi- You may have hit some reinforcing rod. You should not have to push hard.
Less force than trying to drill a 1/4 inch hole in steel. If you can beg ,
buy or borrow a Hilte
hammer drill, the type with the axial hammer , and not rotary impact, your
troubles will be over. It will drill a 1/2 inch hole in four inches in
concrete in 15 sec or so. Jim


.

Relevant Pages

  • Re: Hammer-Drill Technique?
    ... If you indeed hit rebar, a regular metal bit would reveal ... One of the diffs among "hammer drills" is the bpm. ... The Skil Drill will take goddamm *forever*. ... The rotary hammer will do 1.5" holes all the way thru sed 9" wall, ...
    (rec.crafts.metalworking)
  • Re: Hammer-Drill Technique?
    ... > 5 countersunk holes spaced along them. ... I made a drill guide that ensures ... I have a 1/2" Bosch hammer drill to drill the holes, ... A little more pressure, and it start buzzing, but it ...
    (rec.crafts.metalworking)
  • Re: Whats the best way to cut new holes in control panel
    ... Will either need to drill the wood out using a traditional bit (how ... remove the locking nut and tap the mandrel out with a hammer. ... If it's the one piece type, there should be some holes in the back you can slip a punch, screw, ground off nail, etc through and tap it with a hammer. ...
    (rec.games.video.arcade.collecting)
  • Hammer-Drill Technique?
    ... I need to drill a large number of holes in my poured concrete garage ... walls to put up some adjustable metal shelf "standards" (rails). ... What I'm wondeirng is what's the most efficient way to use a hammer ...
    (rec.crafts.metalworking)
  • Re: Moving a hole in a casting, by half a hole
    ... drill (until some B returns my engine hoist, and even then it will be ... There can't be many forces on a lathe that try and bodily lift it from ... need the stand holes to be through holes. ... Plugs work best in blind ...
    (uk.rec.models.engineering)