Chapter 3

 

Limiting Conditions - What's Stopping You?

Chapter 3 

It's not you, it's the limiting conditions. 

Limiting conditions are conditions that force mechanisms to end up with a specific solution. The limiting conditions allow for a solution for the mechanism to be found rapidly. There are three major types of limiting conditions including: toggle positions, stationary positions, and transmission angle. 


Toggle Positions

Toggle positions are found by determining the colinearity of links that move within the mechanism. When the coupler and the rocker or the crank and the rocker end up becoming colinear there will be toggle. This toggle position makes the mechanism stuck and will not allow any further motion past the colinear point. 

Stationary Positions

Stationary positions are locations in the mechanism where there is no movement in it. This can happen when the crank is colinear with the coupler when it is extended or when it is overlapping. This allows for definition of the positions where the motion is limited.

Transmission Angle

The measurement of the transmission angle helps to identify how well a mechanism will move. This is determined by measuring the angle between the coupler and the rocker. This angle helps to figure out how the mechanism will move. 
 


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