Stone core drilling

[renewablejohn]

Have 7 holes to drill through my wall to fit MHVR units each of 100 mm diameter. Any suggestions. Just to put the job in context the walls are 900 mm thick made of 3 walls 300 mm thick solid millstone grit or sandstone. To date burnt out 1 pedestal drill, shattered 2 extension shafts, put crow bar through my lip, taught the locals a new foreign blue language and still only 700 mm through the wall.
Drill bit is 106mm diamond core drill and have tried both water lubrication and compressed air.

Any suggestions apart from getting in a team of professionals.

 

[Sharpy]

Hire a core drill. Whole outfit.

 

[Turra farmer]

Hilti dd130 bolted to wall and give it its time , we have used it to go through 1m thick reinforced concrete took about 6 hours per hole

 

[renewablejohn]

Hire a core drill. Whole outfit.

Most core drill hire relies on water lubrication which is not suitable for my ancient listed walls. Really need a compressed air system but cannot find anywhere to hire.

 

[Turra farmer]

Most core drill hire relies on water lubrication which is not suitable for my ancient listed walls. Really need a compressed air system but cannot find anywhere to hire.

It's only a little water to keep cutting edge cool.

 

[renewablejohn]

Hilti dd130 bolted to wall and give it its time , we have used it to go through 1m thick reinforced concrete took about 6 hours per hole

The sandstone just turns into a thick paste and then jams the drill. Unlike with concrete the excess water is just absorbed in the wall and causes real damage to the ancient lime plaster which I have to protect due to the farmhouse being listed.

 

[renewablejohn]

Was looking to hire something like this

http://www.xcalibre.com/products/drill-motors/magnum10

Has anyone used one. Thought of using tractor spools as the hydraulic power pack.

 

[Turra farmer]

Why not just get electric one ? Seems to be over complicating with hydraulics

 

[rob1]

we had 17 holes to drill into a concrete floor this summer and tried to hire a hilti core borer but despite several firms saying they could supply them none actually could so in the end we hired a floor saw and cut square holes,sorry not much help to you but you may find it hard to actually find a core borer, why not get a firm in to do it, at least its their knuckes that will get skinned

 

[renewablejohn]

Why not just get electric one ? Seems to be over complicating with hydraulics

Have 7 holes to do and already burnt out one motor despite taking it very steady. Have drilled concrete before and thats like soft cheese compared to this stone.

 

[renewablejohn]

we had 17 holes to drill into a concrete floor this summer and tried to hire a hilti core borer but despite several firms saying they could supply them none actually could so in the end we hired a floor saw and cut square holes,sorry not much help to you but you may find it hard to actually find a core borer, why not get a firm in to do it, at least its their knuckes that will get skinned

Been quoted 3000 per hole as its working at height. Just not going to happen.

 

[Turra farmer]

Been quoted 3000 per hole as its working at height. Just not going to happen.

We drill granite regularly which is hard as any stone I've ever seen , drill frame needs to be fixed to,wall level or will jam and don't force it , you can get dry cores for Hilti too ,they just don't last as long ,

This link will do the job easily if set up correctly it even has extension piece , sell it for same in a week when job done ,you might need to buy a new core


http://www.ebay.co.uk/itm/HILTI-DD-...068096?hash=item33d5122480:g:xTIAAOSwOu5ZmEz1

 

[rob1]

Been quoted 3000 per hole as its working at height. Just not going to happen.

bloody hell. I had to drill one 100 mm hole through a wall that had been built of stone, this was near radstock in somerset where miners had dug through this stone to dig coal, how they did it I dont know as it took me 4 hours to drill about 250 deep and burnt out a decent drill and buggered one core bit. good luck dont envy you the job

 

[Lincs Lass]

Instead of drilling full amount from one side ,,could you pilot drill them first and go in from either side ,,only 450 mm each way

 

[renewablejohn]

Instead of drilling full amount from one side ,,could you pilot drill them first and go in from either side ,,only 450 mm each way

Hole needs to be dead straight as the heat recovery unit slides into the tube.

 

[renewablejohn]

We drill granite regularly which is hard as any stone I've ever seen , drill frame needs to be fixed to,wall level or will jam and don't force it , you can get dry cores for Hilti too ,they just don't last as long ,

This link will do the job easily if set up correctly it even has extension piece , sell it for same in a week when job done ,you might need to buy a new core


http://www.ebay.co.uk/itm/HILTI-DD-...068096?hash=item33d5122480:g:xTIAAOSwOu5ZmEz1

I never buy tools like that off ebay as I always assume its been nicked or is knackered. Was looking to hire one of them but as others have said when you come to order there suddenly not available. I presume because hirers have burnt out the electric drills hence looking for a hydraulic solution.

 

[mushnt grummmble]

ask the experts

 

[renewablejohn]

ask the experts

Even they got it wrong with all there planning. When they came to do the job the original drills where not powerful enough and had to be replaced by more powerful drills.

 

[mushnt grummmble]

Even they got it wrong with all there planning. When they came to do the job the original drills where not powerful enough and had to be replaced by more powerful drills.

Well they have learnt from their experiences

 

[phillipe]

Hammer and chisel,knock a stone out,random rubble in the middle, easier to knock a hole out and build back in