MikeT wrote:
On June 28 2006, "Jim Alexander" wrote:

Did the instructions say to make a pilot hole right through? Done a
few of
these, too long ago to remember the exact procedure but checking the
Marcrist
support page it says drill with the pilot drill until the core is 5mm
into
the material then remove the pilot drill. Maybe that is the problem.

Jim A

Be nice to have got that far in Jim

With it all thrashing about all I have done is make a big mess on the
brick surface with the core cutter tips. There were no instructions with
it but I would have remover the pilot if I ever got far enough into the
brick to do so.

The only thing I can think to do now to recover the job is to either buy
a 13 x 250mm taper drill and use that to get a good clean pilot hole to
guide the core in, or grind down an sds shanked 13mm drill I have here
to fit the arbor and use that as above. 3rd alternative would be a bit
of 10mm silver steel rod and grind a taper on that to fit the arbor to
get the core started clean.

Another slightly worrying thing is the safety clutch, no mention of it
in the sds+ drill manual, but is was spec'd on Screwfix's discription. I
emailed screwfix and they replied a day later to say they had asked the
manufacturers and yes it did have a clutch, I guess I will find out if
it tries to snatch on me.


I drilled a couple of similar large holes, same method as you , but I
kept the drill bit in place until core bit was at least 30mm into
brick.
If you have tct then hammer on ... diamond then hammer off.
Slow, with even pressure.

Now to get you going again ... why not fill the hole with a rapid
hardening compound, plenty on sale in B&Q etc, or mix brick dust with
cement and grout fill hole and leaver over night.
Then start again.