Some additional pointers:
- Consider starting the abrasive and water flowing while the cutting head is off the material and then moving into the material from the side, to avoid piercing. This makes it less likely that the part will crack during the pierce.
- Avoid having lots of pierce points in your part.
- Use low pressure to pierce the material. This also can prevent cracking on the pierce.
- Place a sacrificial material on top of the material you are going to cut. This gets the abrasive fully flowing before the jet hits the material.
You can cut almost any form of glass, even bullet-proof. You cannot, however, cut tempered glass (unless you anneal it first).
Dragons cut from black granite, bullet-proof glass, and marble.
When cutting laminated materials with a waterjet, you need to use some techniques to keep the water from getting between the layers and ruining the material.
A discussion about how to cut glass with a waterjet to minimize broken and chipped parts.
A discussion of how thick a waterjet can cut.
Different piercing methods
A discussion of different methods of piercing you can use, some of which work well with brittle materials.