"Bill Woods" wrote in message
...
Do drill bits for use in ordinary "home use" drills get blunt with
the result that they work less well?

I ask this because I recently used my hammer drill to make some 6mm
holes in masonry in the concrete ceiling above me and it seemed like
very slow work. When I used a smaller drill bit of about 4 to 5 mm
in the same masonry material then it was much, much easier to make
the hole. I used a vaccum cleaner to suck up particles and to
prevent the bit clogging with concrete dust.

Of course the smaller bit makes a hole with a smaller area but the
difference seemed far greater than this. I wonder if my 6mm drill
bit (and maybe others) need replacing?

This is the type of drill bit I used:
http://www.tool-up.co.uk/tooldev/images/items/24343.jpg
http://www.tool-up.co.uk/tooldev/images/items/9487.jpg

those don't look like very good quality, rather than sharpen them, go and
buy a real drill and bits, a good quality sds drill at about 100 pounds and
some sds bits to go with it, I have found practically no difference in
quality between cheap and expensive sds bits (ymmv) but the actual electric
drill quality varies a bit, the cheapy heavy sds from the sheds works great
but only if you are strong, a good quality bosch or aeg drill is much nicer
though.

mrcheerful