Abstract: The stiffnesses and natral freeouencies of present traditional strain dynamometer and piezo-dynamometer are too low to be used for the production and research with higher requirement. The reason with which the stiffness of the traditional strain dynamometer can noteffiecently increased is analyzed, the principle and the designing of the six-web dynamometer with combining shear strain with tensile strain are given in this paper. Ca-libration tests show that the new type of universal dynamometer possesses the highest stiffness and frequency in all dynamometers, the sensitivity of the tool-bar dynamometer has got the level for measuring grade-gram force.

Key words: 切削测力仪, 应变式测力仪