Coring Double Hard Brick

[jlperry]

Hi all, bought a new coring set to core through some hard brick for a fan. It is going through, but very slowly. Would drilling some pilot holes help? Any other advise would be great cheers.

 

[Blue Duck]

Every 10cm or so take a hammer and bolster to clear away what you have cut makes less friction so the cutter should go through better.?

 

[SBS Dave]

I used to specialise in condensation control and installed 100's of fans.

I started the cut with the core drill, then drilled a series of small holes (say 5mm) around the groove, using an SDS hammer drill.

This stopped the core drill grinding and allowed cutting and progress was much quicker with less wear on the core drill tips.

If all else fails, "stitch drill" the whole circumference with a 5mm drill and resort to hammer and chisel.

(I couldn't do it now; I've got a touch of frozen shoulder!!)

SBS Dave

 

[Evans Electric]

What SBS Dave said .    If its really hard brick I've ended up drilling out the mortor in the joint ,chisel , then take brick out , fit sleeve and repair around it . 

 

[Blue Duck]

I used to specialise in condensation control and installed 100's of fans.

I started the cut with the core drill, then drilled a series of small holes (say 5mm) around the groove, using an SDS hammer drill.

This stopped the core drill grinding and allowed cutting and progress was much quicker with less wear on the core drill tips.

If all else fails, "stitch drill" the whole circumference with a 5mm drill and resort to hammer and chisel.

(I couldn't do it now; I've got a touch of frozen shoulder!!)

SBS Dave

Was talking with a guy I sometimes work with and he'd never used a core cutter before and had always stitch drilled :|  

​Not surprised you couldn't do it anymore, had a 4hr session and my shoulder hurt for a week after!

ut the kettle on  

 

[Andy™]

hate hard bricks. done one yesterday, took an entire 20 seconds to core drill through the inner wall (well it was thermalite...)  then what felt like an hour to do the outside

also, you get what you pay for - get a cheap core and it will take longer than a more expensive one

 

[batty]

I did three a while back they were the hardest bricks I have done. Double walls also. I think I resorted to drilling with a drill bit in the end core wouldn't touch them.

 

[SLIPSHOD & SLAPDASH]

You should have tried my  old tungsten core cutter that fits my Hilti SDS Max.  It vibrated half the wall away and made your teeth chatter but always got through.

 

[batty]

Dynamite usually also works.

 

[kerching]

Back in the day we were working in an old cobble built cottage in the Lakes.

Plumber bought a new fangled diamond core bit.

When he had finished drilling a 50 mm hole for a waste pipe , it looked like they were having an additional low level window installed

Just saying

 

[batty]

Plumbits don't know how to use core drills. I have seen them use them on hammer action then wonder why the diamond end bits break.

 

[Sharpend]

Back in the day we were working in an old cobble built cottage in the Lakes.

Plumber bought a new fangled diamond core bit.

When he had finished drilling a 50 mm hole for a waste pipe , it looked like they were having an additional low level window installed

Just saying

I'm struggling to see why if the cottage was in the lake, the plumber needs to fit a waste pipe? Surely it was flooded?

Am I reading too much into this?

 

[BlueFlashAsh]

took my bro 3hrs to get through one the other day. but it was a ten year old hire drill that weighed about 10kg lol

 

[kerching]

I'm struggling to see why if the cottage was in the lake, the plumber needs to fit a waste pipe? Surely it was flooded?

Am I reading too much into this?

Thats why he needed the waste......to remove thw water!

Simples really when younthink about it

Just saying

 

[OnOff]

Had to do a kitchen where they had carried on up from the footings in white engineering bricks to about 4' off the floor, must have had a job lot. Total PITA! SDS drilled all the positions then used the Armeg cutter to square off. Fan hole was the easiest, good old Celcon higher up even did the chase with the multitool.

 

[gembrain]

Keep the speed sensible and keep a can of compressed air handy - one with the thin tube attached - and blow out the brick dust around the circle occasionally as you're going. Makes a big difference.