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I need to drill a few 1/4" diameter holes through the porcelain wall tiles in my bathroom.

The porcelain tile is about 3/8" thick and very hard. I tried a masonry bit, no luck.

Next I ordered a set of diamond bits. These are hollow bits kind of like a tiny hole saw.



How would I use these hollow bits to drill a hole at an exact location on the tile without skiding?

Do I need to drill out a 1/4" hole 0n a piece of 1X lumber then use that as a drill guide on the tile?
 

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You need a slow speed drill---a scrap of wood with a hole drilled into it--and a sponge.

center the scrap over the spot for the hole---insert the drill bit and get the hole started--the block/hole will keep the bit from skating all over the place.

Next---push the bit through the corner of the sponge--wet the sponge--set the bit back into your starter hole--drill and squeeze the sponge to get water onto the bit.
finish your hole---

Dry cutting will ruin the bit ----
 
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I recently used some pointed (think arrow tip) carbide bits to drill 3/16. I started with a smaller one to score the surface. Slow speed using an 18v drill.

Back when I occasionally had to drill in walls I used some diamond bits shaped the same.

Always used slow speed and no hammer.
 
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