Abstract
The paper describes the construction of radial gratings having between 90 and 32,400 lines photographed on to plate glass disks of 12 in. dia. or less. Errors less than ±3 seconds of arc are obtained. Applications of radial and linear gratings to various machine tools are described. In a gear hobbing machine errors have been reduced to 1/20 for worm/table rotation and 1 4 in actual cut gears of 20 in. dia. Circuits for phasemeters for servo and for measuring purposes are contrasted, and new techniques for using batching counters with gratings described; typical applications to gear measurement and a gearboxless lathe are mentioned.
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