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Tack122 t1_j25gxnc wrote

Reply to comment by lemonylol in Help drilling a hole through kitchen countertop & flange of undermount sink for a water filter by [deleted]

I've never seen a stone/concrete hole saw with a centering bit.

Is that a thing?

Also, plunge router for stone/concrete is sus.

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luv_____to_____race t1_j25vs5j wrote

No, they don't give us pilot bits in our hole saws. They would just snap off.

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Tack122 t1_j25w323 wrote

Well you'd need a hammer drill for a center bit in stone/concrete. Just spinny would grind off the tip and you'd never sink in.

I could imagine some sort of complicated dual clutched system where the hole saw rides on a hammer drilling center bit, but that'd be a very specialized drill.

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luv_____to_____race t1_j25zhn4 wrote

We can't use ANY hammer drill on stone tops, the many repeated impacts will eventually cause failure in the material. Some may work, most won't. Quartz is made up of about 93% natural Quartz chips, and the rest an epoxy binder resin. It's heated and pressed together in a huge line, and when cooled is extremely durable, but if you start creating point heat/impacts nearing the manufacturing process, all bets are off.

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100GbE t1_j267g21 wrote

Diamond tip bits work well in tile, stone masonry - don't need to use hammer either.

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Hittinuhard t1_j25x5m2 wrote

Yes. Some core bits have a center bit. We have diamond coated router bits that we use with a large water feed to keep the bits cool.

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lemonylol t1_j26ntwm wrote

Ah, just assumed they had them, did not know.

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