Circuit rectification for four precision position synthesis of four-bar and watt six-bar linkages

John A. Mirth, Thomas R. Chase

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The circuit defect arises when a linkage can not be moved between all precision positions without disassembly. The synthesis of linkages by precision position methods is simplified by reducing the design space to include only those linkages that are free of the circuit defect. Solutions for four-bar and Watt six-bar mechanisms are developed here. Multiple circuits in the Watt six-bar chain arise from circuits within a four-bar chain of the linkage or from the limits of motion that are imposed on the entire linkage by the two four-bar subchains. The circuit defects that are introduced by these conditions are eliminated through the sequential analysis of the Burmester curves for four-position synthesis. The points on the Burmester curves where the circuit attributes change are found. The curve segments yielding mechanisms that exhibit the circuit defect are then eliminated from consideration. The process is numerical and based on the complex number formulation of Bumiester theory.

Original languageEnglish (US)
Title of host publication22nd Biennial Mechanisms Conference
Subtitle of host publicationMechanism Design and Synthesis
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages9
ISBN (Electronic)9780791809402
StatePublished - 1992
Externally publishedYes
EventASME 1992 Design Technical Conferences, DETC 1992 - Scottsdale, United States
Duration: Sep 13 1992Sep 16 1992

Publication series

NameProceedings of the ASME Design Engineering Technical Conference
VolumePart F168016-3


ConferenceASME 1992 Design Technical Conferences, DETC 1992
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 1992 American Society of Mechanical Engineers (ASME). All rights reserved.


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