SP/SHEFFER

machine tool accessories, namely power-actuated jaw chucks, rotary workholder-operating cylinders, collets, collet chucks, diaphragm chucks, and jaws and jaw-related top tooling; quick change chuck mounting systems comprised of an adapter mountable on a machine tool and plural top chucks comprising jaw, collet and diaphragm chucks, sold as a unit; and dimensional control tooling systems comprised of boring quills, compensating tool holders, generating heads, compensating pivot blocks, and AC servo gear motors to power the systems, sold as a unit