Drilling into Marble

[rodneyja59]

Ok fitting a fire mable hearth, marble back plate and pine surround. BUT I have to drill through the marble back plate to get a gas pipe through. Marble is 20mm thick, and about 1 metre square. I need a hole 20mm in size about 60mm from one edge.
Question what drill do I use - Masonryl? What speed drill-slow, fast. Do I drill a pilot hole first? say 4mm ? Clearly no hammer action on the drill!

Anybody with any advice?

 

[jeds]

Masonry drill, medium speed, no hammer, dribble water on the end of the bit to kep it cool.

To start off, hold the drill bit against the marble with firm pressure - but don't go mad - and turn the drill by hand to create a small indentation. Then slowly bring the power on and your away. I'm assuming you have a variable speed drill!

 

[Scoby_Beasley]

Or use a small masonry as a pilot and then use a diamond tipped holesaw and as jeds says keep it wet !