I was enlarging a hold in rock with the sds drill, it bound, jumped out of
both hands, spun round and either on the way out of my hand or on the way
round cracked the bone below the ring finger. God only knows what the
clutch is meant to release on, but it didn't work, I guess thats what comes
from buying a cheap drill.
I've googled it but cannot find anything, is enlarging existing holes
generally thought to be a bad idea?
If the larger hole is close in size to the original then definately
yes, a recipe for jamming. However if the pilot hole is pretty small
then there should be no problem. So a 1/4" pilot for a 5/16" hole in
hard stone probably will jam, but a 3/4" hole with the same pilot is
unlikely to jam.
Did it have a clutch? Some cheap ones don't.
A friend has had two nasty accidents, the second of which
resulted in a visit to A&E to have some stiches in his chin
after the drill bit bound and the drill body spun round and
whacked him on the chin. (First time, similar thing happened
but the drill body swung round and hit a wall, and then
managed to put a twist in the core bore arbor before stopping.)
> I've googled it but cannot find anything, is enlarging existing holes
> generally thought to be a bad idea?
What size hole, what type of bit?
[email address is not usable -- followup in the newsgroup]
There is a B&Q supplied SDS that's subject to a recall due to a faulty
clutch. The manufacturer has admitted liability for a fairly nasty injury
caused to a friend.
> If the larger hole is close in size to the original then definately
> yes, a recipe for jamming. However if the pilot hole is pretty small
> then there should be no problem. So a 1/4" pilot for a 5/16" hole in
> hard stone probably will jam, but a 3/4" hole with the same pilot is
> unlikely to jam.
Yep it was 14mm going to 18mm, went down about 3 Inchs before it jammed. I
won't be doing that again.
I checked the manual again and it claims to have a clutch fitted, I'll give
them a call and see if others have failed.