On the existence of modular fixtures (1994) [22 citations — 4 self]
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@INPROCEEDINGS{Zhuang94onthe,author = {Yan Zhuang and Ken Goldberg and Yiu-chung Wong},
title = {On the existence of modular fixtures},
booktitle = {In IEEE International Conference on Robotics and Automation},
year = {1994},
pages = {543--549}
}
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Abstract:
Modular fixtures are gaining wide use for flexible manufacturing and job shop machining. A modular fixture is an arrangement of fixture elements (fixels) that will locate and securely hold a given part. Typically, a human combines intuition with trial-and-error to design fixtures. In some cases designers are unable to design a fixture with given fixels and must resort to custom tooling. It is possible that human designers have overlooked a solution. It is also possible that no solution exists. In this paper we explore the existential question: given a fixture model and a part, does a fixture exist that will hold this part in form closure? If so, we say that the part is fixturable. We consider two classes of fixtures, one using 3 locators and a clamp, the other using 4 clamps. We provide one negative result-- a class of cross-sections that is not fixturable-- and two positive results-- two classes of cross-sections that are guaranteed to be fixturable. These results give us insight into the application range for different models of modular fixtures. 1
