Manny, there are a lot of variables that will go into a reasonable answer. material that you are cutting, tooling that you are using, the way that your shop is set up etc. etc.. having a saw that is not only sized correctly but that is also serviced and supported well are key issues. Positioning the...

Not sure why it's breaking for you but it is not tempered.

Tempered glass will not be cut or drilled or water jetted. Once a piece of glass is tempered it is not possible to alter the shape in any way. Perhaps glass tiles have some residual tempering from the manufacturing process but without seeing the broken pieces I could not tell. There is no reason tha...