Core drilling, preventing blow out

[several]

I'm plumbing in the waste for the kitchen sink, the space underneath is limited what with water meter, stop tap, plumbing for dishwasher, machine machine etc etc. I know where I want to core drill on the inside for the 40mm waste, but relating this position onto the outside is proving difficult.

iF i were to pilot drill from the inside to outside, I'm worried about blowing out the bricks which is not what I want to achieve. Any tips?

 

[Norcon]

Drill a 10mm hole from outside to inside through the cement joint.
Doesn't matter if its wrong.
The main priority is not to blow off a chunk of brickwork or outside render.
Then use this to measure from for the second hole. Again drilled from outside to inside. Then fill the first hole with cement.
Simples.

 

[Agile]

Perhaps I am missing something?

Surely the hole position is dictated by whats inside?

So all you need to do is to drill ( after making sure nobody is standing outside against the wall ) ?

Tony

 

[Nige F]

iF i were to pilot drill from the inside to outside, I'm worried about blowing out the bricks which is not what I want to achieve. Any tips?

Imagine you don`t have an sds/core /hammer drill - only a hammer and cold chisel -Plus a spirit level and a tape measure . I seem to remember we used to put the level through a nearby window and transfer measurements from inside to out

 

[Agile]

I have expected he has a diamond core drill which cuts a neat hole.

If he only has a TC toothed core then he needs to get a diamond one!

 

[DeltaT2]

iF i were to pilot drill from the inside to outside, I'm worried about blowing out the bricks which is not what I want to achieve. Any tips?

Imagine you don`t have an sds/core /hammer drill - only a hammer and cold chisel -Plus a spirit level and a tape measure . I seem to remember we used to put the level through a nearby window and transfer measurements from inside to out

Ah yes, the good old days, where the hard of thinking were soon found out & you'd drive your Viva or Thames van down to the Pie Shop at Lunch time for the pies..............

What is it about this forum, is only having half a brain cell prerequisite for membership??...........

 

[Happyplumber]

Good to see your back again Dickie and the usaul sense of humour well done my lad

 

[Agile]

Ah yes, the good old days, where the hard of thinking were soon found out & you'd drive your Viva or Thames van down to the Pie Shop at Lunch time for the pies..............

I drove a Viva HB from Doha to London!

Broke a spring in Syria and cracked the water pump in a blizzard in Turkey but otherwise ok.

Tony

 

[DeltaT2]

Good to see your back again Dickie and the usaul sense of humour well done my lad

Well, for Christ sake!! Is thinking in short supply??!!!