Andrew wrote:

"Tony Collins" wrote in message ...
I've just done this. Rectangular hole in single tile, and through plaster
board underneath.

Drill hole in each corner of the rectangle (DO NOT USE HAMMER ACTION).


I've often used hammer action to drill tiles for fitting showers,
towel rails, etc., having first used an automatic centre punch to
punch through the glaze and stop the drill bit slipping. This is with
an ordinary B&D hammer, not SDS. I guess it depends on the exact
composition of the tile (Most have been bog standard, mass produced,
put up by the builder types) and what's supporting it behind. I've
never cracked or broken a tile doing this.


I'm surprised. Automatic centre punches are one thing used by car
thieves to break side windows (more discrete than lobbing a brick). I
would have expected the sudden, very high, shock to crack, if not
shatter, a tile.

What am I doing wrong ;-)

Andrew