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Prism Spinners regarding Laser Research

When Westwind Air Bearings Ltd commenced marketing air lubricated spindles capable of speeds in excess of 100, 000 rpm in 1963, it was not some time before the company started receiving requests from both community and private research centres to make high speed rotating devices in order to meet diverse special needs. These ranged from very small, finger-tip size, infrared choppers running upon helium gas in pores and skin cancer detectors to much bigger machines capable of assessment centrifugally-arming artillery shell fuses at increases to 30, 000 rpm. One of the nearly all challenging, as well as long-lived tasks, however, was undertaken under commitment to Britain's National Bodily Laboratory (NPL). This involved developing devices to rotate glass prisms at maximum speeds for use throughout laser research.

The design of your NPL prism spinners posed a selection of interesting problems for the Westwind engineers. The prisms were manufactured from special quality glass, cut with high accuracy, about 2 cm extended and of hexagonal corner section. The specification required how the prism rotate about their longitudinal axis, open at both finishes to light rays incident throughout an unobstructed conical perspective of 120 degrees. These limitations meant the whole rotor, including turbine drive along with air lubricated bearings, could be only marginally longer compared to the glass prism. The solution lay in choosing the prism in a worthless metal cylinder, with a central turbine and symmetrical bearings on either side around the outer surface.

Another restriction on the design came from the requirement how the glass prism should not be unevenly stressed, either by the approach to holding in the rotor or by the effect of rotation. This requirement was achieved only after testing alternative types of holding and required specially shaping the ends with the prism. The final arrangement is shown schematically for the dust cover of the book The design of Aerostatic Bearings published from the Machinery Publishing Co. Ltd. in November 1970.

The first prism spinner sent to NPL ran at 50, 000 rpm. Good results were reported and published in intercontinental scientific journals. Westwind were happy to receive a second order for this first model from a research laboratory in the united states.

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