Waterjet Cutting for Soft Gasket Materials

Soft gasket materials like sponge rubber are tricky to cut accurately because they tend to distort. We deal with this by offering waterjet cutting. It’s a fast and efficient process that’s ideal for cutting large, complex shapes from thinner material. Here’s why to ask for it.

What is Waterjet Cutting?

The process uses a thin jet of fast-moving water to slice through material. The machines look like laser cutters with a gantry that moves the cutting head over a sheet of material. A pump pressurizes the water to around 90,000 psi, forcing it through an orifice 0.015” diameter. This stream of water moves faster than sound, which lets it wear away material it flows against.

For faster cutting an abrasive material is fed into the stream. Abrasive waterjet cutting can cut metals as well as non-metals.

Advantages for Gasket Materials

Applies little force to the material being cut, which minimizes distortion
Accuracy of +/-0.007”
Kerf (the width of the material cut away) less than 0.050”
Tight nesting is possible to improve material utilization
Cut holes with diameters as small as 20% of the sheet thickness
Cut stacks of sheet material: Maximum cut thickness is around 6”, although this is material dependent

In comparison with laser cutting, two advantages are:

No heat affected zone on material edges
High cutting speeds on nonmetallic materials: Rubber sheet ¾” thick can be cut at up to 90’/minute.

Limitations

As the jet moves through the material it deflects rearwards from the direction of travel and can waver slightly from side to side. This results in striations along the sides of thicker material and requires lower speeds when moving into corners.

On thick material jet divergence creates a slight taper from top to bottom. This is handled by angling the waterjet away from the edge of the piece being cut, so putting all the taper in the offcut “lace”.