Design criteria for electro-mechanical transducers and arrangement for measurement of strains due to metal cutting forces acting on dynamometers

Although there have been papers available dealing with tool dynamometers, so far no one has discussed in compact form of detail the basic design principles of elastic members and equations generally used in design. The author wishes to throw some light on this aspect. In this paper, the elastic members which are the most important parts of dynamometers utilising electric strain gages were analysed to detect the suitable place to cement gages on them activated by compression and tension stresses due to cutting forces. Moreover, some arrangement principles for satisfactory construction were introduced. The bridge circuits used with each of the dynamometers were described as well as the mechanical aspect of each unit. Design details of elastic members employed in load measuring dynamometers in the range of planing, drilling, grinding, turning and milling were given in considerable details.