I wouldn't use a masonry bit, but if you have to, do not set your drill to hammer action, or you run the risk of cracking the tile.
It's better to use a dedicated tile bit, which has a flat spear-head shape and a sharp point. Do use plastic insulation tape to stop the bit wandering until it penetrates the glaze and, again, do not use hammer action. As you're going between two tiles, go extra carefully.
Once you're well below the glaze, you can swich to a masonry drill to get the correct size hole.
I have drilled countless tiles this way and have never cracked one.
Edited by ChrisPeugeot on 24/09/2010 at 17:44
|