Abstract:Based on “the couple can arbitrarily move in the application plane, its value remains unchanged”, a new type of four component no centering drilling dynamometer is designed. The thrust measuring cell is made of two X0°Cut quartz discs, and the radial force measuring cell consists of two Y0°Cut quartz discs. Four pairs of Y0°Cut quartz discs, whose maximum sensitivity directions are tangent to the distribution circle, constitute the no centering torque measuring cell. The static calibration results show that both the linearity and repeatability of the thrust, radial force and toque are less than 1%, and the cross talks are also less than 5%, which have full reached the application requirements of piezoelectric quartz sensor.