indexing gear boxes laser suspension jewelry clutches incremental encoder fabrication chains bushings roller chains bearing purses belts machining inductive mufflers photoelectric gears conveyor chain alignment industrial engineering absolute encoder proximity driveshafts milling responsibility photoelectric sensors cnc machining encoder driveline automation light curtains capacitive sensors machine shop handbags optical sensors bearings control belt inductive sensors brakes cad belting cnc accessories conveyor driveshaft motors bags