"John Rumm" wrote in message
...
Tony Williams wrote:

In article ,
N. Thornton wrote:


yes, dont. I dont know just how much effect drililng through the
reinforcing bars would have, but I doubt I'd try it.


I tried it (just the once) on our cast-in-place
reinforced concrete lintels. It involved the
alternating use of a masonery and ordinary twist
drills. Hard graft, and neither drill was much good
after the job was finished.

You can get multipurpose drill bits that are designed for drilling
concrete as well as steel. These may be a better bet for this sort of
task.

e.g.

http://www.screwfix.com/app/sfd/cat/...61550&id=12563

--
Cheers,

John.

When drilling an old concrete fence post with a SDS drill, whilst shouting
instructions at someone, I failed to notice the bright red glow coming from
the fence post. I can confirm that even the best SDS bits in a 4kg machine
don't TOUCH re-bar.

Alex