This paper discusses the application of some basic elastic theory of thin circular rings used as transducers and equations generally used in the design of a surface grinding dynamometer. Octagonal strain rings and their approximation in design application to dynamometers are presented. Examples of calculations are demonstrated. The wiring diagrams of strain gages on the dynamometer are also shown. The calibration setup, curves, and equations of calibration are dealt with. The author has a dual purpose in writing this paper: He wishes to have a record of his design experience for later reference and to share some valuable information with engineers and scientists in the field.

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