"Mikepier" wrote in message
...

They sell special bits for tiles. Try to drill in the grout lines
rather than the tiles. If you must drill in the tile, take your time
and don't force it.

Actually, if your tiles have small grout lines, DO NOT DRILL in the grout
lines, your bit will be hitting the edge of 2 tiles and will either crack
the tile or make big chips in the glaze as you drill. The easiest method I
have found to drill through a tile is to gently tap an ice-pick with a
hammer to chip a little flake off the glaze where you want to start
drilling, then use a brand new - never used before - sharp masonry bit in a
non-hammer drill. Start slowly and don't increase the RPMs too much and it
will cut through the tile.