Mechanism Definition and 511 Threads

A linear Actuator lifts a door upwards against gravity with hinge axis horizontal. Actuator arm is fully extended when the door is fully opened and is horizontal. At this stage, the arm is seen a bit drooping due to weight of the door. How this drooping can be eliminated? Note that Actuator...

Hello, a friend of mine asked me to create a mechanism for a tri-folding gate. The thing is: it has a peculiar sequence when it's opened and I'm really stuck thinking this mechanism. Is there a good book/source about mechanics where I can find inspiration? Thanks in advance

I have an electrically powered yarn winder (that uses the equivalent of a bathroom fan motor) to drive a spindle which holds and turns the yarn cone, and simultaneously drives a chain mechanism which moves the yarn holder parallel to the yarn cone in a back and forth motion along the parallel...

This mechanism move the soil through steel plates attached to chain and gears.The mechanism is unstable since there will be high Fx and Fy of hydrualic cylinder,Any other way to stable mechanism ? or any other design ideas please Thank you

Spin (and therefore photon circular polarization) can be constructed generically in terms of intrinsic rotations on vector fields, whether describing classical and quantum physical systems: e.g. https://scholar.google.co.uk/scholar?cluster=14889979702374754652&hl=en&as_sdt=0,5 Building on this...

i have this mechanism in real life where the linkage move up and down through rollers rotating forth and back , but when mechanism move there is lot of vibration , please suggest any idea how to reduce vibration on the sides indicated by arrow .

TL;DR Summary: E1 or E2? I did the E2 hoffman elimination because it's tbuOh so it's bulky hence does E2 with Hoffman as major product so I chose option A. But the solution manual has done E1 reaction and rearrangement so the answer marked is C. What is the correct mechanism?

The first button releases the front slider which slides through a key way in the lever while it unclamps the sharpie - the lever is supposed to clamp down on the sharpie but just doesn’t. The first slider has a spring inside and is released in the second picture. The second button pushes down on...

Hello a group of students and I are trying to design a car with a wingnut breaking mechanism. However instead of the wingnut hitting the washer connected to the wood and stopping the threaded rod from rotating the threaded rod and wheels actually shift left while the wingnut stays stationary...

What is stronger and better for continuous movement? Screws or pins for a mechanical component made of titanium Ti-6Al-4V

I'm developoing one mechamical device, that we'll put two nutrunner in one gear. One spur gear will rotate the gear and put the nutrunner and one position. Each nutrunner will fix one bolt with 70Nm. I need put one motor in pinion, but i need consider the moments to define de size of the motor...

Someone on a machining forum is proposing a curiosity machine. Imagine two magnets, constrained to move along one axis, set N to N. They will move apart. If you insert a piece of steel in the gap, the magnets will move towards it. The input of the machine will be a rotating toothed...

hello take a mechanism driven by a DC motor in automation books you find transfer functions such as : G(s) = k1/s(s+k2) normally it s assumed that the moment of inertia referred to motor shaft is a constant the point is that in general it is not a constant take for example a slider - crank...

Is it possible to overlubricate a manual ratchet that you operate by hand? I'd imagine if you tried really really hard, you can add so much grease, that it would be so dense, that you couldn't rotate the ratchet, or if you used very thick grease that is like a block of cheese. Or that when you...

My understanding is that : Static Force Analysis carried out on objects in static or dynamic equilibrium, that is rigid bodies that are not moving or moving with zero acceleration therefore, does not take into account the inertia of the object Dynamic Force Analysis carried out on objects in...

https://arxiv.org/abs/0705.1688 https://ui.adsabs.harvard.edu/abs/2014IJMPD..2350054P/abstract https://www.scientificamerican.com/article/time-s-end-will-be-the-end-of-endings/ According to these references they suggest that dark energy can suddenly change sign and causing the universe expansion...

Hi All, I am trying to model this mechanism for a project. It is a switch that uses a solenoid to break the contact by lifting the aluminium arm. I understand that there is most likely software out there that can do this but i would like to understand how to model this from first principals. I...

I'm trying to design a mechanism to translate reciprocating motion into a 45 degree rotation. Here's the idea: A pin will push against the part marked in red, causing part of the desired rotation. Then, when the pin is pulled back, its interaction with the blue part will complete a 45 degree...

Hi, I was wondering if you could help me with a job at the university that consists of the kinematic modeling of mechanism number 3 in the image attached to this message. I have to set up the constraint equations and then solve the position, velocity and acceleration problem. For now I would...

Hello, I'm new to the forum, I want to ask help on this problem here, above is a press mechanism and I'm tasked to draw a velocity polygon based on this mechanism. The point of contact between the two gears is A and consider it as a swivel hinge (rotating but stay still), so I guess it's O2...

Hi guys! I have problems with this mechanism...finding the aceleration with graphic method. I already have drawn the speed diagram and the values of all of them. But, i dont know if my aceleration diagram it is well drawn. I'm stuck especially when trying to plot and calculate the...

Homework Statement:: Model for Gravity Relevant Equations:: Rg -Rg = G/(8pi*c^4)T The rubber table model for gravity can't quite translate to reality. One sees that a ball placed on the table distorts it, but this is due to it being in a uniform gravity field. Just what mechanism distorts...

Determine the amount and type (tensile or compressive) of the spring force so that the resulting force is a vertical force. Also get the resultant force. i find 60N (compressive) and resultant forces is 10800 is that correct?

I'm building a replica of the Antikythera Mechanism; a device that was conceived and manufactured around 50BC. it is an orrery and amongst other things it shows the motion of the five known planets, the sun and the moon when viewed from the earth. I've managed to calculate the motion of the...

Hi everyone! There is a task that I can't solve. Can you explain me how I have to draw the full mechanism? Draw the mechanism of the reactions of step 1 and 2. Indicate the product before step 3. (in step 2 also TMG =Tetramethylguanidine is given and instead of the protecting group DMT was...

Hi everyone I modified some code that originally displayed a toast when the screen was pressed and held. The original code used onTouchListener with a relative layout, but I changed it to a button instead. I think I've copied it correctly, but my program crashes when the button is clicked. I...

I'm trying to come up with a design for a handheld pump that will be used to suck diesel from a car's fuel tank. There's definitely going to be a pipe dipping into the fuel tank, and there's definitely going to be a human manually operating the pump. I'm trying to think of a mechanism that...

Bought this recliner couch DC (During Covid). Left side was opened while the Roomba was underneath and that has caused some misalignment so that now it doesn't open all the way anymore. It doesn't close all the way either, but that's hardly noticeable. I've finally gotten the courage to flip it...

What is the mechanism behind Quantum Entanglement? Why do only subatomic particles exhibit Quantum Entanglement?

(note: I never studied engineering, but I think I have a good math (and slight physics) background. I'm mentioning this not so you'll go easy on me - if I don't understand something, I'm sure I'll figure it out or find someone to help me decode what you're saying. I'm mentioning this in the...

Yarn Grippers, Linear motion equipments Motors

Hi, I am not an engineer and sorry in advance if I am not correct with the terms. I design out of curiosity this Scotch yoke mechanism (left image) based on a scheme (right image). I looked for some equations to find if there is a relation between the R0 , R to R0 distance (which changes...

What is the dermatological condition called severe itch or urticaria? What is its underlying pathophysiological mechanism? While a simple scratch may be a compulsory reflex, it may reward a pleasurable experience. How it is different from an itch, which is considered a pathological condition...

Summary: ##M=3\left(n-1\right)-2j_1-j_2## Hi, I'm trying to get the degrees of freedom of a can crusher. So substituting I get ## \begin{array}{l}M=3\left(n-1\right)-2j_1-j_2\\ n=5\\ j_1=5\\ M=3\left(5-1\right)-2\cdot 5-0\\ M=2\end{array} ## And I would think it would be 1

When I flew on a plane not long ago I started wondering about how flexible headrest works. This kind of headrest is reliable and still holds up well after several years of constant bending. I speculate it employs the same design as gooseneck lamp, but after some Google digging I cannot seem to...

I am not sure, but below is my attempt. In solids the force between adjacent atoms/molecules is very strong. So, when a part of the solid medium is displaced perpendicular to the solid medium like a rope, the atoms/particles in the medium just ahead of the displaced part will tend to bring the...

Summary:: I am making a landing gear mechanism, and am struggling to mathematically model it, the aim is to find the required properties for the spring for it to work. Hi can you help me with a problem, I am making a landing gear mechanism and am struggling to model it mathematically. The aim...

Hello I would love to know how a fishing rod mechanism works. How is the wire always taut? I mean I guess it's a spring. Is it possible to get a consent form from someone? I can not understand how the spring works there Thank you

Here's my current understanding of mass terms. For scalar fields, a mass term flows under RG to larger values in the IR. This implies having mass values in the theory is unnatural because it has to be fine tuned at the UV level to get the correct observed mass at low energy (the term I think...

Pictured below are two hinged panels that can rotate upward to form an upside-down V. In position 1, the panels are lying flat. In position 2, the panels have folded together and the joined edge is raised up. Normally, in order to actuate this hinging motion, one would need to manually lift the...

In a Facebook post recently by a friend of mine who is a very experienced Firefighter Paramedic FF/P (and currently a Captain at our local FD), he mentioned that EMDR had helped him a lot to deal with the traumatic events that Fire and EMS deal with. Several other FFs chimed in that EMDR...

How we may explain or understand the absence of symptoms in an asymptomatic Covid patient? Which following scenario may explain asymptomatic infection more clearly? A highly efficient innate immunity arm takes care of the infection without the need for intervention from the adaptive arm as...

Two things that I think I should say before I describe what I did: First, I do not have any physics-related background (but I have a degree in CS, and I'd like to think I have a good enough grasp on math to be able to understand equations describing motion of objects). So please forgive me if...

Hi! I would like to know how I could define an equation for α with given the two lengths of the rods and angle theta (θ). I sketched the situation below, the problem arises when the rod Lab has pasts the 180 degrees. Like to hear.

As the Covid vaccines become more prevalent worldwide, the hospitalization and mortality rates are coming down hearteningly. Actually, what happens after vaccination? 1) Vaccination causes the production of antibodies. So when later infection happens, the antibodies are up and ready to bind...

Hey Guys, I found this thread about the proper size dimension of a torsion spring for upholding a kickstand in the right position. I have to develop a kickstand for my Omnium Cargo bike. I have been thinking about using the same choice of spring type for my product, but I've also been...

I apologize if this is the wrong area to post this in, I've never posted on thisforum before. I'm trying to form a FBD of a mechanism that uses linear motion to actuate a pin in a transverse direction. I've attached the general idea in a picture where the pin is free to move up and down. In...

I have an application in mind with a hand crank mechanism that will usually not be engaged to a trugh shaft so it can freewheel, but as soon as you start turning the hand crank in either direction it should engage with the shaft. And i want it to be silent (no mechanical ratchets) and with...

Hi, I don't understand why this correction would be a nucleophile substitution? From what understand : The O atoms in the cyclic glucose acts as nucleophiles. ICH3 is also a nucleophile due to the presence of iodine's "non bonding electron pairs" (sorry I don't know the right term for this), and...