David Moodie wrote:
having recently tiled the bathroom I'm now looking to drill a
few hole in the tiles. the problem being that the tiles are
approx. 9mm think and are limestone/porcelain.

Well are you trying to drill limestone, or porcelain, or ? I
guess you do mean porcelain, because of the time it takes!


It has taken about 30 mins to get one 6mm diameter hole done
this morning with a combination of a 6mm diamond tile cutter
bit and a 6mm carbide tipped SDS. While the tile bit does
slowly grind away at the tile this is a long and laborious
process, the bit used is new and a low drill speed was used.
Keeping the area wet is a little difficult given that its half
way up the wall.


I normally use ordinary cheap masonry bits - just sharpen your TCT
bit, put more of an angle on it than appropriate for masonry so
it looks like a tile drill (it then *is* one). To keep it wet, use
a bit of hose! What drilling machine are you using? Are you using
hammer action or not? N.B. bits blunt quickly in very hard stuff
and you will need to "touch them up" (ooh-err missus!) often.



J.B.