This is a special version of our Northfield DPH-400 Diaphragm Chuck (.000010” TIR) with custom top tooling attached. Our customer needed a drawbar-actuated chuck to grip the O.D.’s of various parts they manufacture for their grinding operations. We provided them with a one-chuck solution (shown in that allows for easy changeover of the top tooling components to accommodate all of their parts. One part even required a spring-ejector cartridge to eject the part from the jaws’ grip after the grinding operation is completed. A gauge ring permanently mounted to the chuck establishes a known datum for their machining process. It also has a special shell protecting the unexposed portion of their parts from the action of the grinding process.