# Questions tagged [mechanisms]

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1answer
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### Static balancing of link mechanism

So I'm trying to get to the condition as shown in the picture below, where it says that if we have zero free length springs and k1r2=k2r1, then any configuration (pose) of the link is in equilibrium. ...
3answers
540 views

### One way/locking mechanism without springs or flexible members

There a few neat mechanisms that allows only one way motion without the use of a pawl or ratchet. This is one of them: https://www.instructables.com/id/LEGO-Technic-One-Way-Gear-Mechanism/ What I'm ...
4answers
284 views

### A latch that’s easy to open under lateral pressure

My middle schooler is building a catapult that’s supposed to hurl a ping-pong ball 5 meters: The problem is that the pressure on the latch is so high that the kid just cannot trigger it: The door ...
3answers
271 views

### Polarity of a relative angle - Knee joint angle

I'm wondering if it's correct to write: $$\alpha = \theta_{lg} - \theta_{th}$$ EDIT: the theta angles are defined positive in counter-clock direcction, instead alpha in clockwise direction. My ...
1answer
84 views

### Steering with momentum

I'm thinking of making a RC tank that should be simple as possible. But I'm not sure how to make proper steering for the tank. I googled about tank steering and found (for me) complex solutions as ...
2answers
411 views

### What is this captive screw and barrel nut adjustment assembly called? Picture attached

I'm designing a precision adjustment bracket, and I'd like to have a component that allows the field tech to make small adjustments to push and pull on each axis of adjustment. I went looking to see ...
1answer
72 views

### What is the practical use of Assur Groups and structural analysis?

In Mechanisms and Machines Theory we were introduced to Assur groups and structural analysis where a mechanism is subdivised into elementary Assur groups of different classes. But what is really the ...
2answers
333 views

### Rotary to linear motion - how to make upside down “hammer” mechanism?

I’m not an engineer, however I think this place is the best one to find an answer to my question. So my problem is as follows: I need to create a mechanism, preferably driven by a dc motor, that will ...
1answer
237 views

### Gyroscope/Powerball gearing system for bikes?

There is an interesting and potentially useful property to do with the procession of Gyroscopes, as well as devices like the "Powerball" toy. When the gyroscope is rotating (Ws) and then force is ...
1answer
56 views

### Chain, V pulley, Timing Belt

I'm trying to create a mechanical setup to transfer motion from a motor to two shafts. I need a method to do it that fits the following criteria to the greatest extent possible: Does not slip Does ...
0answers
103 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 ...
0answers
27 views

### Mechanism timed by wheel rotations

I hope this is not off-topic. I’m wondering if someone could please provide some examples of a basic mechanism (I’m thinking something like a bevel/spiral gear, but open to anything) that is attached ...
1answer
1k views

### How does this screw height adjustment mechanism work?

I've been puzzling over this for some time. In this picture, there are two steel frames, with four height-adjust screws controlling the height between them. The roller shown is applying a good amount ...
1answer
591 views

### How linear motion is getting converted into rotational motion in this early toy?

Can someone explain about the mechanism in this folk toy: See Video here: A "penny toy" of around 1900. It has a spring and it converts linear motion in to rotational motion ( that drives the ...
2answers
132 views

### How to mount a rod (rotating)?

I want a rod to freely rotate 360°, it stands vertically and the rod is gonna carry some construction below it. The rod should be fixated to the e.g. the wall or anything on a ceiling. What parts do ...
1answer
307 views

### How can I measure the coefficients of friction of pulleys?

I have to study several industrial pulleys made for lifting heavy weights. It is important to select one which has a low coefficient of friction because the system is based in a hoist and several ...
1answer
332 views

### Quick return mechanism for spring-loaded screw

Looking for a way to convert rotary motion to linear, but it should take less energy to get back to initial position than when going from initial position to the end position. Specifically, a screw ...
1answer
39 views

### Which is the best tutorial on Oldham's Coupling?

I am a sophomore in mechanical engineering and am unable to understand the purpose and functioning of Oldham's Coupling.
1answer
32 views

### How to make slider driven crank go in a certain direction when transmission angle is zero?

I am building a fatigue testing machine that includes the ability to induce stress from torsion, however I am stuck at how to convert the linear motion from the linear actuators we have chosen to ...
3answers
1k views

### What components are needed to reverse the direction of a belt conveyor using one reversible motor, and how do they change the tension on the belt?

On regular conveyor belts, motors are usually placed on the head shaft where material is discharged, and tension is highest at the entrance of this head shaft. However, if the motor were to be simply ...
1answer
274 views

### Transfer of angular velocity in Oldham's coupling with the centre disc not sliding

In Oldham coupling,is it possible that the same angular velocity is transferred from one shaft to the other when the centre disc is not sliding?If so,why do we want the centre disc to slide?I know ...
1answer
252 views

### Why all watches hands are stacked in that specific order ? Can it be changed?

It's just a matter of curiosity, but I find hard to justify why every single watch keep the hour hand below the minute one; from a user perspective, it seems a poorly design decision for those times ...
1answer
58 views

### How to prevent movement in this 3 DOF setup?

I have a 3DOF platform that I'm trying to make more stable. It's difficult to explain in words what the issue is so I've added a GIF below. Any ideas of how I can get rid of this wobble? The DOF arm ...
0answers
62 views

### Why don't we make mainsprings out of Kevlar?

The most important factor for mainspring is, as far as I understand the matter, is their yield point. In this regard, Kevlar beats steel by at least factor of two. So why aren't we using it instead ...
1answer
219 views

### The name of this cross-sectional shape

What is the cross-sectional shape in blue called? The shape, used on the shafts, is used for torque transfer, gears or similar. The three arcs are same diameter as the ball bearing ID, so bearings ...
1answer
160 views

### Curved Slider Mechanism With Two Different Radii

I'm trying to make a slider mechanism that is guided around a curved rail that consists of two different radii. As you can see in the image, the section of the rail with a diameter of 120 mm requires ...
1answer
90 views

### What is the mechanism of the blades movement

this is deblistering machine by Stripfoil. I wounder to know the mechanism of blades movement ( equally ) with one? screw. when the operator rotates the handle, all ...
1answer
2k views

### Mechanism to translate rotation into reciprocating horizontal movement

I am building a machine, and one of it's components is a mechanism that will convert rotational energy to a reciprocating horizontal movement. I am aware of various mechanisms such as the Scotch Yoke ...
1answer
50 views

### Wheel angle for turning

Given a car configuration with a length of L and width of W. If you can give the top left wheel an angle of A to turn A degree how do you derive the angle of top right wheel for turning . I know that ...
1answer
38 views

### Reconfiguring a Safe to only need Four turns

I'm not sure if this is an appropriate place to ask this, but I figure the worst that's going to happen is my question will just get closed, so here we go. I just got my first home defense handgun, a ...
3answers
190 views

### ~121:1 speed reduction; are more gears better?

Taking a 1750RPM 110VAC appliance motor down to about 60RPM, maybe a little less. It's a home project on the cheap, so dropping a few hundred dollars on a ready-made gear box is to be avoided, and I'm ...
1answer
449 views

### What is this kind of bearing called

I came up with this concept for a partial rotation, lubricant free, low friction bearing for a robotics application. Two complementary sets of tensioned tendon-like cables (or tapes) serve both to ...
2answers
38 views

### Switch at the back of a battery eliminator

I have this variable voltage battery eliminator and the "switch" to hold the wire in place is broken. Is there any specific name for this "switch" and can I buy it somewhere to replace it or can you ...
1answer
187 views

### Bearing and Bearing Housing for Said Design

The system that I'm working on has a rotating cylinder (cleaning head). It needs to rotate vertically between two arms, much like a cleaning brush in a car wash. Note: I have not considered how the ...
1answer
54 views

### How do locks for shoe lockers in Sentōs work?

(Please move this question to the appropriate exchange site if it is not this one; I originally posted this here, and a comment suggested that I move it here.) In Danganronpa it appears that the lock ...
1answer
37 views

### Type of electric actuator for a music box?

I'm currently thinking about creating a small piano-like (but of course nowhere as big or complicated) music box which can be digitally controlled with a microcontroller. Therefore I need to know ...
3answers
108 views

### Aircraft carrier arresting cables

I recently was at the Naval Air Museum in Pensacola Florida. There are lots of models of aircraft carriers, including the latest class (Gerald Ford class as I recall). This latest class has ...
2answers
100 views

### How to make a clamp for this motor to move it in two directions?

I'm working on a disc brake balancing machine, as shown below this is a belt pulley drive and for alignment purposes I want motor to be able to move vertically as well as inwards outwards (to tighten ...
1answer
110 views

### How can i move a 5000 lb object with 1500 pound towing capacity?

I'm getting a shipping container delivered to my property that weighs about 5000 pounds. Once it's delivered I will need to re-position it. I'm thinking of trying to use a number of cylindrical logs, ...
3answers
3k views

### Rigid bumpers vs shock absorber bumpers

This question got into my mind when I am cleaning my motorcycle. If spring shock-absorbers like the one below absorbs shock from road imperfections, reducing strain in the motorcycle body as your ...
1answer
77 views

### Gears and rotation

I have to project a mechanism that transform a rotation of $30 \pi/\text s$ from a engine in a rotation of $(\pi/4)/\text s$. One of the gears should be 120x bigger than the other, but this is too ...
1answer
304 views

### Types of articulation

I am in the process of designing an off road vehicle and require a form of articulation between the front and back half and cannot find relevant information on the types of joints available. I'm ...
1answer
200 views

### Type of hinge I should use [closed]

Can you please suggest what kind (type) of hinge / pins I should use to make the mechanism in the attached file. I was considering to use the pins shown in the second image. But I am not sure if it ...
2answers
77 views

### Is there a pressure relief mechanism that operates faster than sound in a material?

In the event of an explosion through a high pressure gas pipe, is there a way to vent the pressure wave, in order to protect downstream objects? The mechanism must be faster than sound; pressure ...
1answer
60 views

### Supporting a Chain While Its Size is Varied

I am trying to model a machine that uses eyelets to support a piece of fabric, and this design uses a chain to hold the eyelets in a loop; the links are pictured below. As this machine runs more and ...
1answer
204 views

### How to make a cyclorotor?

I have looked for a way to make a cyclorotor mechanism which allows the blades to rock/rotate (in the picture below, its rocking I believe) to no avail. I am not able to find the required length of ...
1answer
75 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 ...
3answers
423 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 ...
1answer
98 views

### What is this linear movement mechanism called?

Does anyone know what this mechanism for linear movement is called? I have a different model of something like this, and the black chain appears rigid, so I assume it is the mechanism moving the laser ...
0answers
52 views

### Rotating four cylinders with one motor/actuator

I have a setup with 4 cylinders placed next to each other in following configuration. The cylinders are made of .2mm stainless steel. I would ideally want to rotate them along their axis using a ...