On Tue, Jun 17, 2008 at 4:31 PM, <pethier@comcast.net> wrote:
>>
>
> Here is what works for me. I have a star drill, which is normally held in
>your left hand, struck with a five-pound mason's hammer, rotated slightly,
>struck again, repeated until you are fatigued and still staring at an
>intimidating job.
>
> To automate this a little:
>
> First I drilled a 3/8 hole in the concrete wall with a masonry drill. I have
>one long enough to go through a wall.
>
> I drilled a shallow hole in the butt end of the star drill. Then I put the
>pointed tool in my air chisel. Put a heavy leather glove on my left hand and
>held the star drill up to the small hole in the concrete. Stuck the
>air-chisel point in the shallow hole on the back of the star drill and
>squeezed the trigger. I made sure that I kept rotating the star drill back
>and forth with my left hand. (This is very important. If you don't keep the
>star drill moving, it will get stuck in the hole. ) This made short work of
>putting large holes in concrete.
>
> It's amazing the shiny polished look the shallow hole in the back end of the
>star drill acquires. :-)
Much easier method: buy a star drill that fits the air hammer. My
air hammer came with one, though I think it's only 1/2". I've seen
them much bigger.
--
David Scheidt
dmscheidt@gmail.com
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