There is a wide difference in how well laminated materials can be machined with waterjets. Some materials work very well, with little delamination, while others are very difficult and readily delaminate. You will probably need to do some experimenting with the material to discover how well it works.
There are some things you can do to reduce the risk of delamination:
- If you have the choice, choose materials that are strongly bonded. There can be variations in adhesive or the pressure used to bond the materials.
- 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 delaminate during the pierce.
- Avoid having lots of pierce points in your part.
- Use low pressure to pierce the material. This also can prevent delamination on the pierce.
- In a few cases, you may have to pre-drill start holes.
Techniques for working with brittle materials, such as granite and marble.
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.