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.
49
questions
0
votes
0
answers
27
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 ...
0
votes
0
answers
16
views
"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:
...
1
vote
2
answers
67
views
Mechanical linkage
I am not an mechanical engineer and I have a question about this laboratory rocker (https://www.thingiverse.com/thing:2948680/files).
As I wish to reduce the height of the Model_Base.stl by half, by ...
- 11
0
votes
1
answer
45
views
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 ...
0
votes
0
answers
20
views
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 ...
- 101
0
votes
1
answer
46
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.
- 1
0
votes
1
answer
33
views
Rotating a series of lights such that each one rotates more than the previous one
I want to rotate a series of lights that are all spaced evenly from each other with a single actuator such that when the first light rotates 1 degree, the second one will rotate 2 degrees and the ...
0
votes
1
answer
53
views
How to calculate the mechanical advantage of torque reaction arms (or balanced articulated arms)?
So, I was trying to figure out how to figure out how much force I would need to apply to these articulated arms in order to make them extend or "contract", but I can't figure out.
I tried ...
- 169
0
votes
1
answer
37
views
Planar linkage design based on output curve?
I have the following path,
The smaller radius isn't a hard constraint but the other dimensions are. I have a continuous rotation as the input & would like to design a planar linkage where the end ...
- 121
0
votes
1
answer
57
views
How to achieve sliding motion like this between two blocks?
I want to make a construction of two boxes, that by default would be stacked one on top of the other, but linked in a way that would allow the top box to slide off and then move down so that they are ...
- 1
-1
votes
1
answer
50
views
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.
...
- 1
0
votes
1
answer
53
views
How to do linkage analysis for a two-arm lever?
I am not a mechanical engineer and am hoping someone can explain in simple terms how to do a linkage analysis for a two-armed lever. An example of such a linkage is shown below in the illustration of ...
- 1,625
-1
votes
1
answer
376
views
Why is Scotch-Yoke mechanism not used for internal combustion reciprocating piston engines?
Regarding piston acceleration variations due to the geometric nature of crankshaft and connecting rod motion, in relation to connecting rod length and bore to stroke ratio.
Why is Scotch-Yoke ...
- 258
0
votes
0
answers
100
views
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 ...
- 57
2
votes
3
answers
764
views
Transfer horizontal movement into vertical movement
I would like to transfer horizontal swaying movement of a tree into oscillating vertical movement. How to do it? It does not have to be ideal perpendicularity or straightness. More or less efficient ...
0
votes
1
answer
13
views
Is the DOF for a robot mechanism invariant if it is not in a different configuration?
I understand that if the robot is reconfigured, it can potentially change the DOF, but would the degrees of freedom for the robot also change if specific links were fixed and as such specific joints ...
0
votes
1
answer
46
views
Summing Displacements of two Cranks and Sliders
Is there a linkage mechanism allowing the summation of the throws of two crank and slider mechanisms oriented next to one another in order to control an output slider with a motion equal to the summed ...
- 3
1
vote
1
answer
625
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 ...
- 113
3
votes
1
answer
102
views
What would you call this mechanism and how can I calculate the forces involved
So I have an assembly with two pins sliding in two groves. First I would like to know if there's a name for this so I can do some more research. Second, if the assembly is standing up so that the top ...
- 31
4
votes
3
answers
401
views
Linkage of two shafts that need to rotate different angles
I have two switches that have different throw angles the switches have shafts coming out of them which are connected the the cams that can be seen in the attached pic. One needs to rotate 95 degrees ...
- 41
1
vote
2
answers
244
views
How to generate a repeating semi-circle waveform using a mechanical linkage
How can one, in a smooth way, produce a semicircle wave, as opposed to a sinusoidal wave ?
Imagining the machinery and linkages behind the movement.
I mean the trace. For example a point fixed in ...
- 11
0
votes
2
answers
140
views
3D linkage design - terminology
I am designing an animatronic head, which has five degrees of freedom: pitch, roll and yaw for the head part, and pitch and yaw for the neck part. However, the yaw movements for the head and neck are ...
- 161
0
votes
3
answers
110
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 ...
- 1,033
5
votes
4
answers
2k
views
Rotation around an axis outside of the mechanism
I want to design a system of linkages that will allow me to rotate the green element around the blue point/axis without entering the red circle.
The green triangle to go fully around the blue point. I ...
- 75
2
votes
1
answer
46
views
What is this bistate linkage?
I've found this video on YouTube:
https://youtu.be/hWK8Gv0JHqk?t=220
Watch from 3:40 to 4:20.
I'd like to learn more about this linkage that makes that link alternate between hitting and missing ...
- 123
1
vote
1
answer
56
views
Why does this linkage calculate log?
From wikipedia, there's this animated GIF of a linkage.
Question: How does it calculate log? All I see there are trig functions and circles. log doesn't show up in ...
- 111
0
votes
0
answers
3k
views
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 ("...
- 175
0
votes
0
answers
112
views
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 ...
- 1
0
votes
0
answers
61
views
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 ...
- 101
1
vote
0
answers
193
views
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 ...
- 11
4
votes
0
answers
2k
views
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 ...
- 141
1
vote
1
answer
385
views
Calculating force exerted on plate by link
I am currently involved with a project using a mechanism similar to that seen in 'table tilters' and we are struggling to work out how to begin resolving the forces.
The image shows the state we are ...
- 13
0
votes
0
answers
128
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 ...
- 6,940
0
votes
1
answer
85
views
How to quickly design and simulate crank based mechanisms? [closed]
I'm doing a project on Theo Jansen's Mechanism, where I have to modify the mechanism. What is the most efficient way to design these mechanisms? Is there any good software where I can just draw the ...
- 11
4
votes
4
answers
594
views
what college level teaches mechanical linkage design?
I'm 17 years old and learning first-year college math.
What college level math do I need for mechanical linkage design?
Can I learn designing and creating mechanical linkage without math but with my ...
- 41
2
votes
0
answers
30
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 ...
- 123
0
votes
1
answer
75
views
What are a few low-cost options for building linkages?
I'm working on a project trying to combine a pantograph linkage with a four-bar linkage. I'd like to build it out of relatively at-hand materials (AKA, nothing requiring a machine shop), and I'd like ...
- 123
1
vote
0
answers
398
views
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 ...
- 11
1
vote
1
answer
556
views
How to build a pivot linkage for a robot.
I have asked this question in 3DPrinting.stackexchange forum but got no answer answer. Please take a minute to see if you can help.
I am building a simple RWD vehicle using 3d printer parts. See the ...
- 15
3
votes
3
answers
997
views
How do folding barriers work?
With folding barriers like the one below, how does the orange bar get turned by the green mechanism? What's inside the yellow triangular part?
https://www.youtube.com/watch?v=LF8kSTCZIxw
- 1,033
0
votes
2
answers
4k
views
Difference between Linkage, Kinematic chain, Mechanism, Mechanical element, Mechanical machine and their precise definitions
Recently I started to study about "Design of mechanical machinery". Since I am a person who is very sensitive about words I want to know the difference between these notions and their precise ...
- 139
2
votes
2
answers
153
views
Lengths of Connectors in Steering Linkage
Below is a picture 4-wheel vehicle steering linkage. I figured that in order to steer correctly $(W+D)tan\theta_1=Dtan\theta_2$ where $\theta_1$ is the angle of the outside front wheel, $\theta_2$ is ...
- 21
7
votes
2
answers
1k
views
Design of a Four-Bar Infinity Coupler Linkage
How can I control a Four-Bar Infinity Coupler such that it does not accidentally become a Paralellogram Linkage? It seems to me that, when the bars are all horizontal, gravity could change the ...
- 419
0
votes
1
answer
196
views
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?
- 117
-3
votes
1
answer
113
views
What factors into the high cost of transmission components? [closed]
I've been shopping around for gears, pulleys and other transmission components for building a milling machine over the past few weeks. Many of these parts are so rudimentary and ubiquitous, yet the ...
- 160
5
votes
2
answers
3k
views
Applications of Five-Bar Mechanisms
I have some university work to do based on a real world application with five or six bar mechanism, but I am unable to find such a device. Are there real applications of such mechanisms? I've ...
4
votes
1
answer
17k
views
GIM Mechanism Software (Kinematics / Analysis / Synthesis)
I've recently discovered a very awesome software tool for the synthesis and analysis of mechanisms. The tool is called GIM, from Faculty of Engineering in Bilbao, Department of Mechanical Engineering,...
- 281
1
vote
1
answer
351
views
4 bar mechanism how does this 4 point method work
I'm wondering if somebody could explain the 4 position method a bit more understandably. I am trying to follow the explanation in here. What I fail to understand is how does the actual fourbar linkage ...
- 3,597
7
votes
3
answers
10k
views
What method can I use to make a pivot point in an aluminum linkage?
I recently had a project where I made an aluminum linkage (similar to a scissor lift) operated by linear actuators. Aluminum pieces were fabricated from 6061 "standard" aluminum stock, 6mm (0.25 inch) ...
- 175