[Shop-talk] 1" hole through cinder block ?

[David Scheidt]

On Tue, Jun 17, 2008 at 4:31 PM,  <pethier at 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 at gmail.com