In article ,
Simon wrote:

"Andrew McKay" wrote in message
.. .

Your 500w drill with masonry bit isn't ideal for the job BTW. As I
recently remarked on this forum, I bought myself an SDS drill recently
and suddenly realised what I'd been missing all these years. I had
been trying to use a 650w drill beforehand, and it just couldn't cut
the mustard as far as hard brick was concerned - SDS just pushed its
way thru no problem.

Or use a Cobalt bit in an old 9.6 volt cordless .. i was astounded!!! ... it
went through brick that my hitachi hammer drill was struggling with, like it
was butter!

If you are drilling close to a door or window you may have hit a metal
lintel or window fixing etc. Once happened to me when drilling a hole for
an ariel wire.
Neil