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Questions tagged [mechanisms]

306 questions
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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 drive, then why does car manufacturers use rigid…
Jem Eripol
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Alternative to eccentric spacer nuts

I am using eccentric spacer nuts to create a tight fit between wheels and a rail of a linear sliding mechanism. (Expand the product description in the link to see a picture of it in use). They aren't actually nuts: they have no thread. But the…
Jodes
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Reliable mechanism for counting the number of rotations of a shaft?

I need to create several spools of enameled copper wire, each one rolled on a 3D printed bobbin and with a certain number of turns. In total, there will be several thousands of turns, and I want to count all turns without accidentally missing any or…
HelloGoodbye
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How to make an arduino pick an individual plant seed?

I am trying to build a robot which would plant seeds instead of humans doing it (lettuce, radish and so on). The only problem i have so far is picking an individual seed. How could i do it? I've seen some discs designed especially for such…
Andrei Grigore
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How might a clockwork mechanism be built, to behave in a pseudo-random or chaotic way?

My brother asked me how I might build a functioning alethiometer, which is a fictional device superficially resembling an analog pocket watch, but with essentially random movements. I told him I would use electronics rather than clockwork…
monguin
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How Infinadeck Omnidirectional Treadmill works

I have seen this paper about the Omnidirectional Treadmill With CAD model ( with tiny rollers on it): Which compered its prototype with infinadeck as shown below: but don't see those roller in infinadeck as seen here: So does the rollers in…
Soheil Paper
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recreating old mechanisme

I'm recreating an old mechanisme in 3d modeling software. The idea is that this triangular shape rotates around an off-center axis. This will create 4 phases. first (like in the picture) the construction L is down and stay stable in that position…
frans
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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 head. I could be wrong though.
Winseven4lyf
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Self locking ramp with cylinder

Does anyone know any known applications with a stopping ramp that is acctuated with a cylinder and is self locking in its top position. That means that the force on the ramp doesn't load the cylinder, but is done with proper mechanism. An example:…
Grega
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Mechanism for indicating the direction of a shaft's rotation

I have a shaft, which will change its direction of rotation somewhat randomly in response to external disturbances, without a ton of speed/torque. I need to figure out a mechanism I can use to actuate something like a pin up/down a short distance…
Joe Gallagher
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Equivalent moment of inertia in a crank-rocker mechanism

I'm attempting to model a crank-rocker mechanism (see picture). A motor is connected to the crank side and is driving the mechanism with a torque $\tau_{motor}$. A load is attached to the rocker side which applies a torque $\tau_{load}$. The moment…
Filip Karlsson
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Mechanism to alternate between two lifting ends

I'm thinking of what mechanical mechanism can be used to alternate between two different lifting heads, an adhesive and a non-adhesive side, attached to an arm, so that either head comes forward depending on the position of the arm. E.g. moving it…
Asif Shiraz
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Where do I get basic mechanical components?

I'm looking for a few basic devices such as converting translational to rotational motion, 20:1 gearbox, etc. Found nothing at Home Depot. Could you suggest where does one buys/orders such components?
Michael
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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 torque efficiently. Because the cycles of the machine…
david_10001
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4 bar mechanism simulator

I'm trying to design a jewellery box, with a mirror in the lid. When open, the lid should rest at an angle of about 135 degrees from original closed position. I've been learning about 4 bar mechanisms, they sound appropriate (frame = box, coupler =…
Alan Campbell
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