Questions tagged [linkage]

A mechanical linkage is an system of connected bodies. The connections are called joints, that come in many flavors. Linkages allow you to design various path movements, speed profiles and force changes. The simplest possible linkage is a four bar mechanism and its special case the crank mechanism.

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How to calculate the coupler length in a crank rocker mechanism

I'm trying to learn a bit about building kinematic mechanisms by building a small project. The goal is to be able to open and close a box programmatically via a servo motor. I have a small box that ...
Chris Schmitz's user avatar
2 votes
0 answers
34 views

Gear design for symmetrical opening of two parts

I'm trying to build a lamp which has about 20 identical layers stacked on top of each other. There is a central spine and, on each level, a pair of arcs attached to the spine that are hinged and which ...
DeltaG's user avatar
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Pivot material for linkage hinge?

*** modified design with new gas spring approach -I couldn't find shoulder bushing with large enough shoulder diameter so I will buy nylon tubing and cut them to lenght (Item 11) and add abs washer I ...
Setdesigner's user avatar
1 vote
1 answer
764 views

Is there a formula that relates the two angles in a crank rocker?

I'm working on a mechanism that requires a crank rocker - is there a formula that relates the angle (to some fixed reference; horizontal, vertical, whatever) of the driving "crank" to the ...
T.S's user avatar
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Analytical six-bar linkage trajectory solution

Six-bar linkage is shown on the image: It has one degree of freedom, so if one of the variables is constrained, it's possible to calculate the positions of all the joints. In this specific case the ...
Naiten's user avatar
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Synthesis of 5 bar mechanism

I'm working on my university project but I can't find a proper synthesis method for 5 bar mechanism. I'm working on underactuated mechanism. It's a slider crank with the connecting rod divided into 2 ...
Pranav's user avatar
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Free body diagram problem: Linkage w/ magnets and friction hinge

I am a bit stumped on a IRL problem, which i simplified in the diagram below: There are left and right beams (gray) linked together by a friction hinge. The bottom beam (black) is connected to the ...
Philip C's user avatar
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I am too dumb to make Peaucellier–Lipkin linkage work

I tried in math.stackexchange.com and they send me here. First: Don't crucify me for not "doing math", or asking a dumb question. School was a long time ago, and lose what you don't use. My ...
Bizz Keryear's user avatar
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Online CAD resources for designing folding linkages?

I'm trying to design a space-saving, wall-mounted, fold-away workbench that has an auxiliary platform that folds out. The fold-away linkage to support the aux platform when it's folded out is taxing ...
Octavio Masomenos's user avatar
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40 views

Mechanical Rotation about a Virtual Axis for Robot EOAT

I am working on a robotics application where we are erecting a cardboard box and stapling the ends shut. I need control over the "top" end flap to make sure it is out of the way for the rest ...
Aaron Holwick's user avatar
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"Snapping" shut/quickly closing gates

Suppose you have a set of two gates like so: Where you only want one of the gates to be in the "open" (non-blocking") position at any given time, this being the other possible state: ...
GhostDog98's user avatar
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Number of degrees of freedom of parallel mechanism

Can anyone provide me with the number of degrees of freedom (translational and/or rotational) at point P? Edit with my assumptions: The left picture shows the mechanism from the side and the right ...
lookingforananswer's user avatar
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What is the correct term for a joint stabilized by three points of articulation?

I am trying to find the correct term for this mechanical principle. I have a biomechanical system where two objects are anchored to each other along three points of articulation. These points are ...
user2352714's user avatar
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1 answer
65 views

Linkage Mechanism Doubt

I am unsure how I would solve this. I have tried to solve it and got -29.1 but my attempt was wrong. Could someone please lead me in the right direction or show me the way to solve this? Thank you.
Abigcha's user avatar
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What is the effect of caster angle in automobiles? What will happen if we use neutral caster?

What is the effect of caster angle in automobiles and what will happen if we use neutral caster? We study that positive caster makes vehicle more stable at high speeds. It increases lean while ...
Ibrahim Omer's user avatar
0 votes
3 answers
121 views

Linkage between two vertically and horizontally offset wheels

I'm trying to drive a wheel with a radius of 20cm that is 20cm above the motor and horizontally offset by 20cm from the motor, similar to the following: I wonder what a good linkage might be for a ...
John M.'s user avatar
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Toggle position of a fourbar slider-crank

In the fourbar mechanism as in the following picture, I have to find the toggle position, the sliding distance and the time ratio. Here is my understanding/plan to do this: The toggle positions ("...
ComradeH's user avatar
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Static load analysis for four-bar linkage?

I am facing a difficult question and can't find answers anywhere else. What on the left is a hydraulic ram, it's pushing the box in the centre to move upward, while the four-bar linkage attached on ...
Alpha_Go's user avatar
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Is there a spherical joint equivalent to a 4 bar linkage?

In a 4-bar linkage, all the joints are regarded as hinge joints. However, when I searched "spherical 4-bar linkage system", I didn't get a 4-bar system with spherical joints but instead a 4 bar system ...
Stan Shunpike's user avatar
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136 views

What is the correct mathematical approach to this linkage problem?

I have a linear actuator with 52 millimeters of travel. I have a set of linkages with specific dimensions as shown in the images below, to which this actuator will be attached. The REF dimension is ...
fred_dot_u's user avatar
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1 answer
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How fast can Jansen's linkage driven walker go?

I've seen videos of Theo Jansen's linkage driven walkers, and they all walk really slowly. Is it because they want to showcase leg movement or these things actually can't move fast?
jva's user avatar
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wingrotor rpm regulation; wind turbine regulation mechanism how it works?

First figure-Fig. 23. Regulating wingrotor, rotating in feeble wind, wingspan fully open. Second figure-Fig. 24. Regulating wingrotor, rotating in strong wind, wingspan contracting. ...
technik4's user avatar