The Base Tangent Method Or David Brown tangent comparator Or Flange Micrometer The base tangent length is the distance between two parallel planes which are tangential to the opposite tooth flanks. The number of teeth over which the measurement is to be made for a particular gear is based on its total number of teeth and pressure angle The purpose of tangent tester is to determine the mean value and variation in base tangent length. It is measured between two parallel measuring surfaces tangential to unlike gear teeth flank. In this method, the span of a convenient number of teeth is measured with the help of the tangent comparator . Procedure In this method, the span of a convenient No. of teeth is measured by David brown tangent comparator. The anvils of the comparator are first set of the base tangent length with the help of slip gauges . Then, slip gauges are replaced by the gear which is to be measured. Reading are taken by the compar...
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