Bit # Of Holes

[Alwayslearningelec]

How many holes can you get from a 5" core drill bit going through a 6" poured oin place concrete slab if using a quality bit? Thanks

 

[rc/retired]

I have to say either as many as you want or as many as an engineer will allow.

 

[infinity]

I would say at least 50 holes.

 

[LarryFine]

It depends on how hard you are on the bit.

 

[infinity]

It depends on how hard you are on the bit.

And who's running the machine. I see many guys who simply don't use enough water which kills the bits prematurely. Best practice is hooking the machine to a garden hose and leaving the valve wide open.

 

[PaulMmn]

Is it fresh concrete, or has it 'aged' a month or two, and achieved its full hardness?
See if the archives for Find Homebuilding Magazine has any equipment test on drill/core bits.

 

[ggunn]

Is it fresh concrete, or has it 'aged' a month or two, and achieved its full hardness?
See if the archives for Find Homebuilding Magazine has any equipment test on drill/core bits.

It also seems to me that one factor would be the type, size, and amount of the aggregate in the concrete. Some concrete I have seen has been mostly rocks.

 

[rc/retired]

It also seems to me that one factor would be the type, size, and amount of the aggregate in the concrete. Some concrete I have seen has been mostly rocks.

Add rebar and post tension cables.

 

[roger]

Add rebar and post tension cables.

Post tension cables brings up an important consideration. Before drilling a post tensioned slab it will need to x-rayed

 

[gadfly56]

Post tension cables brings up an important consideration. Before drilling a post tensioned slab it will need to x-rayed

Yes, if you cut through a post-tension cable, bit life will be the least of your worries.

 

[grich]

Post tension cables brings up an important consideration. Before drilling a post tensioned slab it will need to x-rayed

Our TV transmitter building has three suites. One of the other suites had an OOPS recently. They didn't x-ray, because they were sure they were clear of the cables. They didn't realize there were some conduits in the slab and cored right through one. They didn't need that wall outlet anyway.

 

[infinity]

I agree that post tension slabs are a different animal. The OP didn't mention them.

 

[rc/retired]

I agree that post tension slabs are a different animal. The OP didn't mention them.

That's correct. The OP didn't mention much of anything. Kinda hard to really answer the question.

Ron

 

[infinity]

That's correct. The OP didn't mention much of anything. Kinda hard to really answer the question.

Ron

He didn't provide much detail but 6" of poured concrete slab sounds like a pretty basic building.