Contact V/s Fixed Value V/s Motion Reading Methods for Poka-Yoke classification

C. Contact V/s Fixed Value V/s Motion Reading Methods for Poka-Yoke classification :
These use the principle of physical or energy contact with the product using sensing devices. They range from guide pins, limit switches, photo electric beams, etc.
Contact methods often take advantage of parts that are designed with an uneven shape. We can use guide pins or blocks that don’t allow the product to be seated in a machines jig in the wrong position.