I haven't had the opportunity to do any CNC cutting of glass yet but i've done a lot of cutting, grinding, engraving, and polishing of glass.
First off there are different types of glass. In order from softest to hardest:
Lead Crystal
Soda lime (most common, most glass ware, bottles, most windows)
borosilica (pyrex is a brand name for this time)
Fused Silica (for special uses such as windows on the space shuttle)
There is some variation within each classification (except for fused silica), but for cutting purposes you won't notice much difference.
Your most likely using soda lime glass, which is much softer than granite.You can up spindle speed and feed rate. A important thing to keep in mind is that it is much more temperature sensitive than stone. It will chip and or crack very easily, so take extra care to make sure your tool is very coolant saturated, and don't go to crazy on the feed rate. |