Instantaneous centre of lock jaw pliers (4 bar link)

[liamke70]

trying to plot the movement of the instantaneous centre of lock jaw pliers

first image is an example of the 4 bar link and the second is a sketch which I've drawn of what i think it would be. is this the only instantaneous centre?

 

[phinds]

Perhaps it is clear to everyone else, but I have no idea WHAT center you are talking about. Can you draw a red dot on your first image showing where the "center" is that you mean? Also, what part(s) do you assume are not moving? It could be the upper or the lower handle sections (I assume it's the upper section but without saying, your problem is ill defined).

 

[liamke70]

the instantaneous centre of zero velocity(sorry should of mentioned that)

the red line is connecting the dots of the instantaneous centre of zero velocity at five positions through the movement of the pliers

the top link (top handle) is fixed in my example

dose this clear it up?

Thank you :)

 

[phinds]

the instantaneous centre of zero velocity(sorry should of mentioned that)

I don't know what that means.

 

[pmacias]

I would first like to clarify that the term "instantaneous centre" is not commonly used in the field of engineering or mechanics. It is more commonly referred to as the "instantaneous center of rotation" or "instantaneous center of motion." With that being said, the instantaneous center of lock jaw pliers can be determined by analyzing the motion of the four bar link mechanism.

Based on the provided images, it appears that the instantaneous center is located at the intersection point of the two perpendicular lines, where the two links of the pliers meet. This is because at this point, the motion of the two links is perpendicular to each other, resulting in a zero velocity and acceleration at this point. However, it is important to note that this is not the only instantaneous center of the pliers. As the pliers move, the instantaneous center will also change, following the motion of the four bar link mechanism.

To plot the movement of the instantaneous center of the lock jaw pliers, one can use mathematical equations or computer simulations to analyze the motion of the four bar link. By tracking the motion of the links and calculating the intersection points of the perpendicular lines, the path of the instantaneous center can be plotted. This can provide valuable insights into the motion and behavior of the pliers, which can be useful for design and engineering purposes.

In conclusion, while the intersection point of the perpendicular lines may be the most commonly used instantaneous center for the lock jaw pliers, it is not the only one. The instantaneous center will change as the pliers move, and its movement can be plotted using mathematical equations or simulations.