Porcelain Tile / August 30, 2018 / Brousseau
Now that the pilot hole has been cut it is possible to drill the main (large) hole. Attach the appropriate diamond core and ensure that there is a constant supply of cold water (see water cooling information in the previous sections of this article). Diamond cores that are larger than 13mm will require an adapter with pilot pin that locates into the pilot hole that has been cut previously to ensure the perfect hole will be made. Starting the drill vertically begin to drill in a circular motion with sufficient pressure until the tone of the drill changes.
Cheap porcelain tiles can be difficult to properly install. Cheap tiles may look nice on the surface but they may not be able to be cut cleanly with a tile saw and may chip on the edges. Also if the tiles are porous then it will be difficult to clean up the excess grout. Grout haze can become embedded in the tiles and make them look vastly different after they are installed compared to what they looked like before they were installed. Cheap tiles can have quality control issues. Many times people choose their sample tile and then order them.
It is not advisable to try and cool the drill bit by using an aspirator or drilling through a wet sponge these methods will not keep the drill bit cool enough and the drill bit will burn out. Set the electric drill to between 700 and 900 rpm. Make sure that the drill is in normal mode. Push the carbide drill bit gently into where you have marked the tile until you hear a cracking sound. Start drilling from a vertical position with sufficient pressure and dont stop until you hear a change in the tone of the drill. As soon as you hear the change in the tone begin to ease off.