Wet Vs Dry Drilling

[Concrete guy]

I would have to dig out the wired grinder as my 18v Dewalt grinder is only 7000rpm which is too slow I believe for dry hole saws.

That would probably do just fine, but a corded grinder would probably do better. Some of the cordless non branded grinders are now so cheap we have a number of customers that bought one just for holesaws and box all their bits in with the cheapie grinder to save taking blades off their their regular machine each time the wanted to drill a hole.

The M14 threaded dry bits are designed to run at 10,000 rpm but we have customers that use an M14 to Hex adapter and fit them in drills. Not recommended but it works, particularly in marble, travertine limestone etc.

 

[moomarine]

That would probably do just fine, but a corded grinder would probably do better. Some of the cordless non branded grinders are now so cheap we have a number of customers that bought one just for holesaws and box all their bits in with the cheapie grinder to save taking blades off their their regular machine each time the wanted to drill a hole.

The M14 threaded dry bits are designed to run at 10,000 rpm but we have customers that use an M14 to Hex adapter and fit them in drills. Not recommended but it works, particularly in marble, travertine limestone etc.

So you reakon 7000rpm would be OK then? What would it do just reduce the life of the bit?

 

[Concrete guy]

So you reakon 7000rpm would be OK then? What would it do just reduce the life of the bit?

I'm not sure it would reduce the life, just drill the holes 30% slower.

The way these grinder bits work is speed and diamonds. Just don't lean on them, let them cut through themsleves.

 

[moomarine]

I'm not sure it would reduce the life, just drill the holes 30% slower.

The way these grinder bits work is speed and diamonds. Just don't lean on them, let them cut through themsleves.

Gotcha!

 

[Stef]

Try Alan's dry core bits for your drill as they work well.

 

[macten]

I've just received some bits from ATS. I included the 8 + 6mm in one dry bit with wax centre. Look forward to trying it out. Also looking at going down the route for angle grinder bits for larger holes.

 

[moomarine]

I went for some dry cut angle grinder ones from a tilers shop near me as I need one of them for tomorrow so I will see how that goes!

 

[Dan]

I went for some dry cut angle grinder ones from a tilers shop near me as I need one of them for tomorrow so I will see how that goes!

How did it go?

 

[Rosco100]

Always use dry angle grinder drill bits as time is money and they do go through a lot quicker than a wet system. Yes they some don't last long but have recently bought the Genesis ones and they're great and they last well even drilling porcelain.

 

[stephenoneill]

I use rubi dry bits and they are excellent especially the 8m and 10 m the 6 doesn't last as long. Always with the grinder .more powerful than drill