ELECTRONIC MICROMETERS EMPLOYING DIGITAL PROCESSING TECHNIQUES

摘要

There is disclosed an electronic mircometer including a stepper motor drive, which stepper motor causes a shaft to rotate in a clockwise or counter-clockwise direction in a series of discrete steps. The stepper motor is coupled to a micrometer spindle so that each pulse applied to drive the motor is indicative of spindle movement. When the spindle contacts a work piece to be measured, the motor is de-energized and a counter stores a count therein indicative of the dimension of the work piece to be measured. The spindle is then automatically retracted an adjustable amount to enable clearance and insertion of the next work piece to be measured.