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Prism Spinners pertaining to Laser Research

When Westwind Air Bearings Ltd started marketing air lubricated spindles capable of speeds in excess of 100, 000 rpm in 1963, it was not a long time before the company started getting requests from both public and private research centres to make high speed rotating devices to fulfill diverse special needs. These ranged from tiny, finger-tip size, infrared choppers running about helium gas in pores and skin cancer detectors to much bigger machines capable of testing centrifugally-arming artillery shell fuses at accelerates to 30, 000 rpm. One of the nearly all challenging, as well as long-lived projects, however, was undertaken under contract to Britain's National Actual Laboratory (NPL). This involved developing models to rotate glass prisms at optimum speeds for use in laser research.

The design of the actual NPL prism spinners posed a range of interesting problems for your Westwind engineers. The prisms were created from special quality glass, cut with high detail, about 2 cm extended and of hexagonal corner section. The specification required how the prism rotate about its longitudinal axis, open at both comes to an end to light rays event throughout an unobstructed conical angle of 120 degrees. These limitations meant that the whole rotor, including turbine drive and air lubricated bearings, could be only marginally longer as opposed to glass prism. The solution lay in locating the prism in a worthless metal cylinder, with a central wind turbine and symmetrical bearings on either side about the outer surface.

Another restriction on the design came from the requirement the glass prism shouldn't be unevenly stressed, either by the technique of holding in the rotor or with the effect of rotation. This requirement was reached only after testing alternative methods of holding and required particularly shaping the ends from the prism. The final arrangement is shown schematically around the dust cover of the book The planning of Aerostatic Bearings published by the Machinery Publishing Co. Ltd. in November 1970.

The first prism spinner shipped to NPL ran at 50, 000 rpm. Good results were described and published in global scientific journals. Westwind were happy to receive a second order for this first model from a research laboratory in the us.

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