On Tue, 25 Dec 2018 09:33:09 -0000, 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

I wanted a 25mm hole for an outside tap (allowed for a bit of insulation
stuffed in before making good. Pilot drill from inside, no plaster so went
centre brick. Through inner leaf horizontally, hit the bottom edge of a
brick on the outer leaf.
Ran the 25mm drill through from each side to cavity and 15mm pipe wouldn't
go through. No debri - just the f'ing courses out and enough offset for a
cock-up. Took far longer to 'fettle' the hole than it did to drill it.
--
Peter.
The gods will stay away
whilst religions hold sway