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wazeaz 03-17-2008 06:30 PM

drilling hole in sink
I need to drill a hole in a white kohler porcelin sink. How do I? Will a steel drill bit work? The hole is for a filtered water faucet. 1/2 inch dia.

USP45 03-17-2008 06:31 PM

never tried it. may work, may not. lets see if Ron might have an idea. he has some good insight on things.

Ron The Plumber 03-17-2008 07:31 PM

Your not going to drill a hole in porcelain, it's like glass, it will do nohting but chip and shatter on the surface.

Why not mount the filter water spout on the counter top, next to the sink. or get a new sink that has the extra hole in it.

Marlin 03-17-2008 10:14 PM

I would imagine you could drill porcelain with a diamond hole saw.

Double A 03-18-2008 01:38 AM


Originally Posted by Marlin (Post 108692)
I would imagine you could drill porcelain with a diamond hole saw.

Imaging and doing are two different things. If this sink is enameled cast iron, the enamel is very thin and very fragile when not in full contact with the cast iron. The surface is quite hard to resist shock from above. Drilling it with any sort of hand drill, even diamond can cause it to shatter because its so thin and once the surface is penetrated, the edge of a bit that is moved or spinning out of balance or true to its own axis will contact the adjoining surface and blow it out. Drilling the cast iron has it own set of problems too. Heat must be controlled or the cast iron will expand or contract faster than the enamel or vice versa and you will get a shatter of the enamel. Just like putting cold water in a hot coffee pot.

Its a very technically challenging thing to do and most pros would even consider it. You run a higher risk of replacing the sink than getting a hole in it unscathed.

If its all porcelain or clay, you might be able to drill it, but I wouldn't risk the sink unless you're willing to replace it.

I'd replace the kitchen faucet to free a hole if possible, or install the dispenser in the counter top.

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