Abstract

A most remarkable double air bearing spindle, with a central variable-speed motor, is used to rotate the diamond. The massive table floats on an air film. When all goes well the thirty-six faces are flat to at least a quarterwave and all angles to 5 sec of arc or better.

© 1978 Optical Society of America

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Figures (3)

1
1

The machine is an old heavy planer whose table floats on a film of air. A vertical air bearing spindle with a central variable speed motor rotates the diamond. All this happens with no perceptible vibration.

2
2

A dividing head consists of a heavy accurate spindle. At one end is a large plate with accurately spaced holes into which a tapered plunger inserts. At the other end is affixed the aluminum blank for the polygon.

3
3

The pencil points to the diamond tool. It has a convex edge with no roughness visible under high magnification.

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