A Generalized Approach For Providing Effective Tolerance On A Link In Planer Mechanism Considering Pin-joint Tolerances

Abstract:-Mechanisms are designed for desired output or required performance for specified input. Error in link<br>length and joint clearance results in variation in the performance of mechanism. Machines are consisting of<br>mechanism for their successful operations. The link length inaccuracies are due to no. of factors like machining<br>errors deflection of link, clearances in joint etc. Due to manufacturing defects &amp; clearances, the link length varies.<br>This variation in link length causes variations in designed performance of mechanism. In this paper a simple class I<br>four bar mechanism is analyzed, assuming that links are rigid. Design engineer wants tight tolerances for accurate<br>performance; while on other hand manufacturing engineer prefer loose tolerances. This paper proposes an<br>approach to identify the effect of change in link length on the performance of the mechanism, using relative velocity<br>method.