Compass cutting warped material

The Importance of Standoff Height, Especially with Bevel Cutting

Standoff height, the distance between the tip of the mixing tube and the material you are cutting, is important when cutting parts on a waterjet. In a previous blog I provided recommendations for proper standoff height. In general, stand off height should be about 0.100” (2.5 mm), or as thick as a dime. When your jet is perpendicular to your part, straight up and down, then raising the standoff will increase noise, mess and round the top edge of the part. You will lose a little cut power as well.

It’s important to maintain stand off under conventional waterjet cutting.

How Waterjets Work

Standoff Height: How Close Should You Be?

The standoff height is the distance between the tip of the mixing tube and the material. A standoff too high causes dimensional problems and alters the top edge created by the jet as it gradually widens in open air.  Standoff too low risks scratching material on rapid traverse between cut paths, or snapping the tube causing downtime, cost, and angry operators.  Standoff height should be approximately the thickness of a coin (varies depending on your nationality, obviously) – about 0.100” (2.54 mm).

Standoff Height

I guess I could end the blog right here, but I think there are a few more things you might want to know about standoff height.

Waterjet 101 Waterjet Technology Overview