Questions tagged [mechanisms]

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1 answer
108 views

How to design a gear decoupling system?

I'd like to convert my stupid door lock into a smart one. I already have a gear for the lock knob. Now I'd like to design a gear decoupling system that will be connected between the knob and the motor ...
0 votes
1 answer
29 views

Adjustable Locking sliding

I have a siding mechanism with a pipe inside of a cube. The cube can be hollow or have a hole that is about equal to the diameter of the pipe. The goal is to have the pipe lock to a specific height ...
0 votes
1 answer
49 views

Automatic Powder Detergent dispensing in washing machines - Concept Building

I have seen the technology for liquid detergent Auto - Dispensing in washing machines where we load the detergent at one go only and the machine automatically dispenses it according to its need for ...
0 votes
1 answer
97 views

Mechanism that moves slowly to release a payload from a drone

I need to build a mechanism that moves a pin to release a payload from a drone. The drone is very small (150 grams) and the payload will be very light, something like 2 or 3 grams. I can't use any ...
0 votes
1 answer
157 views

How to make a circle spin from the edges

I have an issue where I need to make a large wire through a bearing spin in 3" diameter circles, and have a weight hanging from the bottom of the wire. Essentially, I need a hole that moves in a ...
0 votes
1 answer
159 views

Automated Opening and Closing of hinge

I am trying to design a mechanism that puts tension on a string. The purpose is to dip this string in a solution for a stipulated amount of time, and once the time is up, the string is pulled back up! ...
0 votes
1 answer
40 views

How this active probe work?

I'm currently designing something that requires an adjustable scroll wheel mechanism like the one on this active probe. Unfortunately, I don't have the device myself to examine. Would anyone be able ...
0 votes
2 answers
237 views

Looking for feedback on a lift bed power lift mechanism

I built a king size lift bed. I want to add a powered lift mechanism to raise and lower it to access the storage area under it. In order to get the height I want when the bed is raised, I'll need ...
1 vote
2 answers
82 views

Mechanical Clock Oscillation time too small

I am trying to build a mechanical clock, but my pendulum doesn't swing for very long when stopping. Increasing mass only takes me so far. In this video, he uses a much longer pendulum than 25 cm, but ...
0 votes
0 answers
30 views

How do I find the pitch for the fly press?

To solve the problem first I need to find the pitch of the screw to find the shearing stress, is the stroke 45 degrees per 5.75mm or 90 degrees per 5.75 mm?
1 vote
2 answers
804 views

What is this type of detent mechanism called?

I'm trying to find out what this common rotary detent mechanism is actually called. I see them in all sorts of cheap plastic toys, and I'd like to see if I can find them for sale, but I don't know ...
0 votes
2 answers
27 views

How do rotate a picture on a wall once every 24 hours?

I have a picture with various day and night scenes that I would like to hang on a wall and have automatically and uniformly rotated once every 24 hours. The picture is roughly 55cm in diameter, 2cm ...
0 votes
1 answer
31 views

Finding rotation across a spring/elastic shaft

I have not yet seen a problem like this across any course I have taken, but am curious how to approach this. Say that you have a system like this: Here some torque is being generated at a motor, ...
5 votes
1 answer
624 views

Quick return mechanism for spring-loaded screw

I am 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 ...
0 votes
2 answers
77 views

Is a centrifuge force-based levitation system operable in the real world?

In the sci-fi comic Betelgeuse, the artist Leo presents a flying car with an unusual system for levitation and propulsion. The interesting point is that at the end of the comic, there is a page on ...
2 votes
1 answer
505 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 ...
0 votes
3 answers
120 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 ...
0 votes
2 answers
170 views

How to attach a metal rod to an air cylinder?

I have signed up for an engineering class, and the first project is purely mechanical. I've never done mechanical work, so this is quite interesting to me. I have come up with the following project - ...
0 votes
1 answer
34 views

Button activation on turning gear mechanism

Description of the mechanism: By turning a manual crank the mechanism activates a microswitch to activate an electronic circuit. The rotation is continuous and the microswitch must remain activated ...
0 votes
1 answer
2k views

Calculate the required torque of a motor

I want to know how much torque I need for my engine. Imagine a wheel with a motor in the center. One like this: Let's say the wheel measures 400mm, weighs 10KG, what is the formula to make that ...
1 vote
1 answer
90 views

Passive mechanical element that can act as counterforce for a spring

An elavator is a moving cabin that gravity acts on. On the scales of the typical elevator application (a skyscraper for example), gravity is constant. So the gravitational force can be counteracted by ...
0 votes
2 answers
96 views

Connect two motors to different planes and rotate them on the same center point

I am trying to design a kinetic art sculpture. I want to rotate two independent planes at the same center point and control both their speed and direction independently. So I've found that having two ...
0 votes
0 answers
37 views

What is the general approach to having three hands on a clock all rotate on the same axis but at different speeds? [duplicate]

I want to build an art piece which would have three disks rotating all about the same axis at different speeds. Mechanically this would function just like a clock with hour, minute and second hands (...
1 vote
1 answer
716 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 ...
0 votes
3 answers
105 views

Modulating Output of a Pulley with Variable Inputs

I am working on a recreational project to take variable inputs and convert them to a constant output without substantially altering the force required to achieve such a task. The best way to visualize ...
0 votes
1 answer
98 views

Dynamic Analysis Of A Four-Bar Linkage Powered By A Motor

Below is the dynamic analysis for a single rotating link which is driven by a motor. It shows the 2d front view and the 3d full view. The equations for the analysis require knowing the location of the ...
0 votes
1 answer
391 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 ...
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0 answers
13 views

Complete classification of lower kinematic pairs

During research I keep seeing the statement saying that all possible lower kinematic pairs can be classified into one of 6 types, those being: Revolute Prismatic Screw Cylindric Spheric Planar While ...
0 votes
1 answer
36 views

What's the best way to mount many clock hands on a custom clock?

I'm building a custom clock that requires 4-5 clock hands that need to move individually. I've designed it so the hand are to be mounted on telescoping brass axles (that have press fit gears ...
0 votes
0 answers
9 views

Why does animation rate affect motion study outcome in Solidworks?

I get a shortened or lengthened movement period in a motion study, depending on the frame rate that I choose. The frame rate should not change the results of a motion study should it?
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0 answers
36 views

A mechanism that modifies the sine wave so it is flattened at its peaks

Piston displacement as a function of time produces a sine wave. I need to modify the motion so the time the piston spends at both the bottom of the stroke and the top of the stroke are extended. The ...
0 votes
3 answers
224 views

Mechanism to engage and disengage a motor shaft

I have a motor attached to a spool, attached to a string. The string is attached to a rod that is able to move backwards and forwards freely but when the rod is pulled back too far it compresses a ...
0 votes
0 answers
35 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
20 views

How can a slipper assist clutch on a motorcycle provide a friction zone?

Most modern motorbikes come with a slip and assist clutch - this is typically provided by a mechanism of ramps that will force the clutch plates apart when the engine drives the wheel under hard ...
4 votes
4 answers
609 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 ...
6 votes
2 answers
5k views

Is there a mechanism that can turn circular motion into alternating circular motion?

I'm trying to power and agitator (alternating circularly back and fourth) with a crank. I've seen a bunch of complicated mechanisms that do this, but I'm looking for the mechanically simplest method.
0 votes
2 answers
112 views

Is there an english equivalent of a "Polplan" in structural analysis?

During my civil engineering studies, I've come across the notion of a "Polplan", a method for determining the possible infinitesimally flexible configuration of a statically indeterminate ...
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0 answers
44 views

What is the mechanical mechanism of Dermapen?

I need a mechanism that converts rotational motion to a reciprocating mechanism at a horizontal line using a dc motor. By 'horizontal line', I mean the motor and the reciprocating part are in the same ...
-1 votes
1 answer
52 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. ...
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0 answers
82 views

What forces act on the nut-axle of a medieval crossbow?

This is a single-axle trigger mechanism for a medieval crossbow. The string is held by the two teeth as the top of the cylindrical nut, and the trigger at the base of the nut keeps the nut from ...
0 votes
1 answer
39 views

Characteristics of a smooth belt

I want to replace a cylindrical pulley, so I came across a component called a smooth belt. Now this thing came with many differenent variations, from 2.00" up ...
0 votes
1 answer
56 views

Making a basic sprung mechanism that can withstand moderate percussive force

I'm making a game where you have to hit targets, kind of like whack-a-mole except the targets aren't actively actuated. I'd still like an element of mechanical "feel" to it, so I'm aiming to ...
1 vote
0 answers
982 views

How does this SpaceX Starlink ground station antenna's gear mechanism move it in both altitude and azimuth?

Ars Technica's Teardown of “Dishy McFlatface,” the SpaceX Starlink user terminal links to the YouTube video Starlink Teardown: DISHY DESTROYED! and a screenshot from there is shown below. There are ...
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0 answers
73 views

Building Equations of Motion

The following figures represent a model of a building, can someone help me, extract the newton equations of motion and determine the degrees of freedom.
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0 answers
74 views

Creating a lift system that will lift a pop up camper roof that has been changed from the original design

I have taken a pop up camper that was rotten and rebuilt it to serve as a portable blacksmith shop. I have built the new frame from wood, making it as light as I could but lets face it, the wood frame,...
0 votes
2 answers
1k views

Simple mechanism to convert linear motion into 180 degrees rotation

I want a simple mechanism to rotate something 180 degrees when another thing moves linearly past/through it. The below is what I have, but it can only work with an offset, so the movement is never ...
0 votes
0 answers
13 views

Doubt regarding Macaulay resultant formulation: How to proceed when the numerator and denominator matrices are singular?

I was remommended to post this querry in Engineering stackexchange, as my original post in mathoverflow was out of scope. Apologies, if thats the same here as well. I was drawn by the method of ...
0 votes
2 answers
65 views

Why do some car's A-engine-mounts have bolts vs studs vs both?

I have come across engine mounts of various cars and am just curious primarily related to the "A" engine mounts where some manufacturers use only BOLTS, while some use only STUDS and some ...
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0 answers
91 views

How to design a spherical wrist for a robot?

I need a spherical wrist - where last 3 DOFs have axes that intersect - for a 6DOF robot arm, but I can't imagine the mechanics of 3 servos + brackets with intersecting axes. Is this even possible? ...
0 votes
0 answers
42 views

Bi-directional rotary to linear locking mechanism

I'd like help coming up with a simple brushed DC motor-powered mechanism that achieves the following. Rotating the motor clockwise causes a linear mechanism (a pin) to arrive at position A Further ...

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