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Figures (6)

1
1

An appropriate size blank was cut using a resin bond diamond wheel on a surface grinder. The cut was made by many oscillations and slow down feed.

2
2

The long bar was then loose-abrasive-lapped on cast iron to size and, where necessary, to polish.

3
3

The concave groove was ground the length of the element using a convex formed diamond wheel.

4
4

A rotating soft-steel mandrel and 1-μm diamond powder polished the concave cylindrical surface. The hand moved the work back and forth as the mandrel rotated. Note the spiral in the rotating lap.

5
5

A collimator was used to determine the squareness and parallelity of opposing surfaces. The silicon nitride was polished so that it gave a reflection; by comparing this with that from a target alongside any necessary corrections could be made.

6
6

Sections cut from the bar are illustrated. Note that with this method there was little or no rolled edge.

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