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Acrobatic_Wonder8996 t1_izxj04w wrote

Submerging the glass in water is simply an easy way to keep the drill bit lubricated with water. You could also apply a constant trickle of fresh water to the drill bit, if the glass couldn't be submerged. The idea is to flush the little bits of glass away, as they break off, and to keep the drill bit from getting too hot.

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Scott_Abrams t1_izxqq4n wrote

This right here is the answer. The Rehbinder Effect basically describes the observation that surfacants (a chemical that reduces the surface tension between substances such as soap) reduces the hardness (a measure of localized plastic deformation) and the ductility (how easily a substance can be drawn) of a material, thus making it easier to deform and manipulate. By submerging the glass inside water, you can reduce the cutting force of the drill and better control the rate of abrasion. In this scenario, water is being used as a lubricant.

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JonJackjon t1_izye9al wrote

I believe the Rehbinder effect applies to ductile materials only.

I would go with cooling and removal of particles.

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chrisbe2e9 t1_izxsyqa wrote

This is how I carve stone. I either submerge it in water or have a constant stream of water running over it to prevent the bit from getting hot.

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UnamedStreamNumber9 t1_izzzuvc wrote

Not just the bit: the material itself. Glass in particular has cracking issues when there is a high heat gradient on the material being drilled/cut

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MaygarRodub t1_izy6dkv wrote

I would also assume that the water minimises the vibrations, as a lot is absorbed?

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[deleted] t1_izy0k75 wrote

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Master-of-Ceremony t1_izy23kc wrote

What pressure? You’re going to be essentially at atmospheric

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[deleted] t1_izy5qba wrote

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Master-of-Ceremony t1_izy6bj6 wrote

Uneven pressure? Can you elaborate?

Also, being under 4” of water is about 1% above atmospheric pressure, which the atmosphere itself fluctuates by

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