The way to ensure the quality of edge spraying tungsten carbide is to continue spraying the transition edge at the edge of the plane. Where this is not possible, sometimes a row of grooves are made on the surface of the illuminator at the edge of the substrate. Of course, the groove can also be opened on the entire plane. This kind of tip can be called "macro roughening".
However, only those places where a very thick tungsten carbide coating is sprayed with a high shrinkage material can be grooved on the control surface. For most applications, it is enough to spray a little over the edge during spraying. When spraying over the edge, make the groove very close to the edge.
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