Holding devices for machine tools; workholding devices, namely mandrels, and components thereof, for use in holding parts during machining operations; workholding devices, and components thereof, for use on machine tools with an adjustable part-stop to locate a part in a specific location; concentric rings for use with workholding devices, namely mandrels, for confirming or qualifying the accuracy of the mandrels, all being part of machines

Holding devices for machine tools; workholding devices, namely mandrels, and components thereof, for use in holding parts during machining operations; workholding devices, and components thereof, for use on machine tools with an adjustable part-stop to locate a part in a specific location; concentric rings for use with workholding devices, namely mandrels, for confirming or qualifying the accuracy of the mandrels, all being part of machines