I am laying 12X12 glazed ceramic floor tile and naturally a lot of them have to be cut. So far all the cutting has been (and will mainly continue to be) straight line across the whole tile. I have a cutter where you put the tile in and run a carbide wheel, like a glass cutter, along the tile. A guide bar keep you going in a straight line. It does a good job of giving a straight score along the surface, and then you snap the tile. It's the snapping part that's giving me problems.
The tile cutter has a built in gizmo with a little tab where you put the tile in vertically and use the cutting bar to apply leverage; I've used that before with smaller thinner tiles, but it did not work well for these sturdy 12X12s. I've tried various other methods - the best luck I've had so far is putting the scored tile in the workbench clamp, then whacking it with a rubber mallet. But even that has a considerable failure rate. Failures range from the snap deviating from the score, to the tile just breaking into many pieces. I think part of the problem is that the clamp jaws are only about 4 inches wide.
What I'm hoping for is a good tip on a better way to snap the scored tile. I don't really want to rent a saw if I can avoid it. Thx, -- H