Power Actuated Three-Jaw Chucks: Analysis of Gripping Action and Implications

Provision for reliable gripping action is a key factor for industrial application of high speed turning. High speed Machining in production requires safety against burst and adequate gripping over the operating range. The present work is subdivided in two parts. In the first one numerical stress analysis with FEM of main components, under both static and dynamic loads, is described as well as spin test up to rupture speed for design optimization purposes. The second one deals with an in-process gripping force measuring device especially designed to operate in a closed-loop regulation system. Results obtained in the course of an experimental investigation and problems concerning dynamic gripping action are discussed.