A dual-purpose positioner-fixture for precision six-axis positioning and precision fixturing: Part I. Modeling and design

This paper introduces a moving groove fixture which can be operated in two modes; as (1) a precision fixture or (2) a six-axis nanopositioner. Actuators and flexure bearings are integrated within the structural loop of the fixture, thereby enabling controlled changes in fixtured orientation and position while retaining high fixture stiffness. The combination of positioner and fixture characteristics enables one to adjust the fixtured position/orientation and then repeatably fixture about that position/orientation. Models of the fixture's six-axis kinematic characteristics and stiffness were generated and used to design a prototype.