Drilling hard wall tiles



Hi, I'm new to this forum but hope someone can help. I am fixing some large wall tiles which are 10mm thick Italian porcelain. My usual tungstan tipped drill bits are not up to the job of drilling the tiles. I need to drill a number of holes @ 20mm dia for supply pipes. Any ideas as to a good drill bit to use?
I have also tried diamond tipped drills but they are not much better.
I don't want to cut the tiles and saw a hole using a tile saw.
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You can get special tile bits, which have a steel shaft with a triangular hardened bit which cuts through the tile. I used one to drill holes in porcelain floor tiles to screw a toilet pan to the floor.

Found a pic... Piranha bits by Black and Decker:

could you make a small hole with one of those specialist bits then unhook the blade on your tile saw and thread it through the hole?
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Another method for thick tiles like these is to use a grinder. Grind the back of the tile, centred on the centre of the hole position. Make a bowl shape in the tile until you just break through the face surface, leaving a hole large enough for a tile saw (or file). Then open the hole to the required size.
Thanks for the advice. I think the main problem is that I was running the drill bits too fast and they were just 'melting' the surface! Using a slow speed and water to keep the drill cool seems to help. Still a tough job though :confused:
it called advertiseing/here (admin :) )

an if you seen the bits ...

what are you using....?

how an why trouble ???


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