the form of separate contacts with separate terminals. construction the switches are made of uniform switching packets assembled to form a stack. each packet consists of two switching elements whose moving contacts are operated by moulded plastic cams when the operating shaft is turned. serration ball...
roller bearings radial radial-thrust, thrust-radial persistent linear. provide mobility along the axis, rotation around the axis is not normalized or impossible. there are rail, telescopic or linear linear bearings. ball screw transmission. provide a screw-nut interface through the rolling elements...