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Figures (8)

1
1

Cross section of element of revolution.

2
2

Pencil points to the sapphire cylinder polished on the waxed-in side. The cylindrical fixture accurately positions the sapphire true to its axis. The empty fixture on the right shows the recess.

3
3

The correct overall height is obtained by grinding on a Blanchard with a diamond wheel. The assembly is held vertically in a v-block.

4
4

A concave hemisphere is generated by a small diamond-plated cylinder tilted at the correct angle. The pencil points to this diamond tool; speed of tool 20,000 rpm.

5
5

The hemisphere is polished using a ball bearing as a lap and a ¼-μm diamond. The final polish is achieved using hard plastic. Note that the work oscillates and rotates at the same time.

6
6

Close-up of polishing setup.

7
7

Interferogram showing creditable accuracy of the concave surface.

8
8

Grinding the cone using a flat diamond wheel and the correct tilt angle. The work rotates at 100 rpm, the diamond wheel at 5000 surface ft/min.

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