SIngle use core drill for 125mm diameter hole

[HandyAndy49]

I have an SDS hammer drill but no core bit.

I need to install a single boiler flue that needs a 125mm diameter hole. The wall is 450 mm thick solid stone.

Can I hope to use a TCT £25 bit (I've seen several through Amazon and other on-line sales places) and take the plug out in 2 or 3 inch sections by drilling the cored part with a 100mm bit and chiselling the remainder before doing another 2/3 inches depth?

Andy

 

[muggles]

Sounds like a long-winded way of doing it. Either spot drill around or better still go to your local hire shop and hire a 125mm core

 

[MUFC1999]

Tell me its not a battery drill, because if it is going through a wall that thick and it being stone good luck you will need it

 

[Paul Barker]

To use a tct core that size you need somethink like a Hilti TE-80.

I imagine your drill is even pathetic for doing diamond holes.

Stone walls often have to be part demolioshed, flu placed in void and wall rebuilt around it.

 

[mrgas]

Wont your gas installer have one?

 

[holty]

if its something like granite walls which can be around 2ft, id say paul barker is spot on.the only way we get round doing flue holes on this situation is having a decent setup,that being a marcrist wet core drill and bits.tct wont last a minute.or taking the stone out and rebuilding round it as mentioned.

 

[Andygasman2010]

450mm stone.... for me that's only gonna go with a propper diamond core bit and drill. The SDS hammer drill and TCT stuff you mentioned isn't designed for this job really, it'll probs burn out and the bits will dissintegrate in minutes. Obviously, don't use the hammer function. Either hire the right gear or get a diamond drilling company in to do it. It'll save a lot of time and effort in the long run.

 

[Paul Barker]

some stone can't be diamond drilled. Others can.

but non will respond to a pants drill and tct cores.

 

[Andygasman2010]

Ah I see, I thought diamond drilling would have been the best method.

What's better?

 

[MUFC1999]

I drilled through a stone wall once with a core drill and a diamond bit and it took me 5 hours it was about 3 foot thick, glad i live in the city, not many stone houses in machester, thank god

 

[Andygasman2010]

Next time i get one, i'll be getting a quote from a specialist company!

 

[holty]

good luck.i live in a county were most houses are stone/granite.and believe me youd think there would be good buisness for this sort of thing.but the hasssel involved and the price most specialist companys charge.it will kill any profit,or the job itself money wise.spent a day once drilling for the condense.still cheaper than most firms though.

 

[Paul Barker]

Next time i get one, i'll be getting a quote from a specialist company!

sandstone drills very easily

Limestone is a problem diamond won't make a dent in it after half a days drilling taking yturns with your mate you will be 2mm into it.. when you hit it with hammer it smashes to bits you can't make a controlled hole in it. You have to knock out a lump of stone at a time, put your flue in and rebuild the crater afterwards. I get a local to that area builder to rebuild it as he has the skills.

Also when drilling condensate through limestone your entry hole is the size of your bit and the exit hole large enough to put a flu through, as once you get through the loose fill layer the outer block gets punched out rather than drilled through, attach condensate pipe to but of drill and push it through together or else the loose fill from the wall above will be imposible to travaille.

When a pproaching a stone job add a full day for making holes, and a few hundred quid for the builder to make good plus any scaffolding requirements. Can add a few grand to the job and you stiill make no more money out of it.

It's the price people pay for living in a well built outer shell.

All core drilling is very tough and requires top quality top price equipment. the jokers who come on here asking if they can drill using a tct core and a small sds drill make me want to cry.

It's all very well trying to do it yourself. But why do you think professionals spend thousands upon thousands of pounds on equipment?