In article ,
Tim Watts wrote:
On 25/12/2018 09:33, Andrew Mawson wrote:
"charles" wrote in message ...

In article ,
Brian Gaff wrote:
It is more likely to be that the hole was not in fact at the point you
imagined. Its hard to follow the brick lines when a door frame is in the
way.

The question is why start from the outside in the first place if te
pipes
are inside start from there and you will be sure not to hit them.
Brian

You get a neater finish to the hole if you start on the outside. The
final
"breakthough" can be quite messy.


Drill a pilot hole from inside to exactly determine location, then drill
full size from the outside. If using a core drill stop before all the
way through and resume drilling from inside.

Andrew

+1

Starting with a TCT core without hammer will get a neat hole both sides,
even if you switch to a full sized SDS bit to take out the bulk. I
usually take an 8mm (or whatever the pilot for the TCT bit is) long
drill to go right through.

I have a 1 metre long 8mm drill for just that purpose.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle