Questions tagged [mechanisms]

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16 views

Tiny sliding mechanism

I have been trying to build a sliding keyboard phone attachment for a while now, but can't seem to get anywhere. Basically, I want to combine my Moto Z Play with this cheap, generic bluetooth keyboard....
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2answers
37 views

Do you know any mechanism that can pass a thread through several holes?

Well i am stuck trying to figure out this problem, actulally i see a machine that can make it with a torus, a torus coilling machine. But that not work with a multi turus shape. I want to automate ...
2
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1answer
28 views

Controlling torque required to turn a shaft

I have an shaft/crank that will be turned by the user. I want to precisely and dynamically control the torque required to do so. For simplicity we can think of it as a exercise machine (so the torque ...
2
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1answer
48 views

How to pull on one side, while keeping an angle?

I have the following setup, consisting of a bar attached to another bar via a ball joint (indicated by a circle, and attached to the wall over a pulley with a weight at the end (the small "kg&...
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3answers
61 views

calculating the minimum force needed to lift a rigid awning - class 3 lever problem

I am building a camper and one idea is to have an extra 4 solar panels as an awning bolted to a a rigid frame, hinged to the camper at the top. It hangs down the side of the camper. I will use one ...
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42 views

What mechanism do safety belts use to engage?

Earlier today I came across a creep testing machine that uses a safety belt as a mechanism for stopping loads from hitting the ground. It is probably the first time I saw a safety belt roll outside of ...
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0answers
25 views

Can you get the ratchet mechanism out of a socket wrench by itself? Anyone know where if so?

Title pretty much says it all; looking for a reversible ratchet hub for a special latch that I'm designing. Definitely open to any ideas/sources that the community at large might have. Thanks!
3
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2answers
82 views

How high will a flywheel catapult launch a payload?

First off, this is not a homework question or anything like that. I'm trying to build a catapult to launch a payload using a flywheel as an energy device! It goes like this: The flywheel spins up to ...
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2answers
80 views

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 ...
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0answers
23 views

High articulation joints

Looking for advice or suggestions for high articulation joints (>57°) for an automotive halfshaft. Peak operating conditions are in the ballpark of ~1000RPM, ~300ft-lb torque. I've considered u-...
3
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4answers
71 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 ...
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49 views

What type to mechanical joint to achive Slide then Rotation motion

I have two parts (Green and red fixed) i want to connect them with a joint (Blue) that permit the green one to slide outwards then rotate. Side View (Right part) a simple pivot point doesn't work ...
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3answers
197 views

Mechanism for controlling the clamping force

I am working on upgrading a research project on wind energy. They are trying to measure the performance of wind blade designs in a small wind tunnel (i.e. their models are relatively small). What they ...
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2answers
43 views

What is a constricting actuator called?

I'm looking for search terms, I'd like to find something like an electric hose clamp - a high-force, low-power, low-speed, motorized constricting mechanism. I already googled some terms various ...
4
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1answer
70 views

How to trace a square with a reuleaux triangle

I am trying to trace a square (with rounded corners) using a reuleaux triangle and a single (circular rotation) motor. I've seen many animations (example) of this but do not understand how to make it. ...
4
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1answer
97 views

How is linear motion achieved in this automatic blackboard eraser?

In the animation shown below what can be the mechanism used for this purpose? I know it can be achieved by using rack and pnion gear arrangement. But how are this set up arranged in classroom ...
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1answer
42 views

product to tackle problem of senior citizens of our society who forget to take pills due to Memory Loss [closed]

For a lot of senior citizens of our society, taking medications is a necessity. Although necessary,it can be tedious sometimes. More often, these patients forget to take pills due to Memory Loss. Is ...
3
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1answer
80 views

What can be the mechanism used in devising a machine that can arrange the dishes properly to make the cleaning faster in the messes/hotels [closed]

In hotels/messes the used plates are often placed haphazardly, and the workers need to pick the plates carefully to clean them. This leads to longer washing times and longer waiting times for ...
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1answer
37 views

How is mechanism used in modern projector different from intermittent mechanism used in conventional one?

Do modern projector used for digital class works on same old conventional intermittent mechanism and blocking of light during change of frame. What is principal used in modern projector?
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1answer
34 views

What is the reason for the intermittent motion and blocking of light during change of frame in Conventional projector?

Conventional Film projectors do not advance from one frame to another by continuous movement of the reels. What is the reason for the intermittent motion and blocking of light during change of frame ...
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1answer
38 views

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 ...
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1answer
22 views

Gear mechanism for automatic gate

I have a sliding gate installed on my compound wall. I want to control the gate opening/closing with a motor. I have the electronic circuitry to control motor start/stop. I m thinking about attaching ...
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1answer
46 views

Torque acting on a rotating wedge due to a linear force parallel to the axis of rotation

Let's say I have a wedge which can only be rotated about a fixed axis perpendicular to the ground. There is a cam follower mechanism constrained to vertical movement with a ball roller on the end ...
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1answer
21 views

Serrated locking part

I need to fixate something at adjustable approximate angles. It doesn't need to have a lot of holding power. So the idea is to have washers/nuts that are serrated, that when closed in together, locks ...
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0answers
26 views

Where do I learn about jewel bearings?

I would like to take a deep dive into the world of jewel sourced watchmaking components (including, but not limited to, bearings) but I am having trouble finding any textbooks on the subject. Are ...
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1answer
49 views

Is there a way to convert a short throw in one direction into a long throw in two directions

I have a motor that I have created a simple adapter for; this lets us attach any parts we might design to solve the final problem: I would like to convert the motors motion to oscillating motion in ...
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0answers
58 views

How does a power hacksaw lift on the forward stroke?

Hacksaw blades cut on the pull stroke (back into the machine) and are supposed to lift on the push stroke, all the DIY setups I have seen cut on both the pull and push stroke, i.e. What type of setup ...
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49 views

Making a machine to sort out old bolts, washers, nuts etc in workshop

I spend a lot of time in my workshop sorting out and putting back into their boxes bunches of screws, washers, nuts and other assorted niknaks and I want to make a machine to take this chore off my ...
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3answers
6k views

How do bike wheels keep turning when the rider stops pedalling?

I am very confused with something regarding bikes... How is it that a bike wheel continues to spin (either from momentum or from going downhill) when the rider is not pedalling, without also spinning ...
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1answer
36 views

Maximum velocity of an athlete [closed]

I was solving a mechanics sum An athlete running a 100m run starts from rest and reaches the maximum speed in a distance of 15 m. He runs the remaining distance with that velocity and reaches the ...
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0answers
52 views

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 ...
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0answers
17 views

Clutch for high-speed operation (>40 000 rpm)

I'm currently working on a setup where at some operations my motor has to drive a shaft up to the motor's maximum operating speed (12,000rpm) and a torque of ~0.14Nm but at other conditions this shaft ...
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1answer
27 views

Is a scissor mechanism considered a parallel manipulator

According to Wikipedia (I know) a parallel manipulator is a single end effector driven by several serial chains. Does this include a simple scissor lift mechanism? And is there a better definition of ...
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1answer
360 views

What are the 'poles' off the side off this aircraft carrier's flight deck?

Looking at a model of the HMS Ark Royal I found myself intrigued by the prominent 'poles' lining the flight deck. Some investigation on Google reveals that they can apparently be lowered to lay ...
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0answers
39 views

How do these thread-holder mechanisms work?

In old scientific apparatus for electrical experiments, and more particularly in instruments such as galvanometers and torsion balances, we often need to hold one end of a thread in place. Examples ...
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1answer
41 views

Design suggestions for Mechanical rotating disc with 30 degrees step

I am a software engineer with no knowledge of mechanical engineering. I need to buy or build a rotating disc which can rotate in 30 degree steps only i.e each time I try to rotate it, it should take ...
1
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1answer
46 views

How could I get the coordinates of the circumscribed circle giving the 3 points coords?

I have the coordinates of 3 points thrgouh which, a circle should pass . Having the coordinates of the points in 3D, how could I have the coordinates of the center of circumscribed circle ? also : if ...
2
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1answer
84 views

Latch Mechanics

I want to make a sprung latch mechanism which keeps a door in place until a certain force is applied to the door. In the diagram attached, the force the door must release at is Fd, and the latch ...
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0answers
30 views

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 ...
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2answers
74 views

Where do I get basic mechanical components? [closed]

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?
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1answer
59 views

how does this z-axis micro-adjust lead-screw design work

The picture (which I found on the web without any accompanying explanatory text) shows a home-made z-axis micro-adjust lead-screw add-on to the vertical milling attachment of a vintage hobbyist lathe. ...
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2answers
51 views

How to configure strain gauges for tension measurement?

I have a machine which has belts with three pulleys, one of them is connected to the motors,the one in the middle moves to tighten the belt, and the third is idle pulley. This belt assembly sits on a ...
0
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1answer
27 views

small gearbox for experimental wind mill

The gear box will have little torque as I am only using a 12 by 18" wing which rotates. The two shafts I am using are 1/4 ", one form the wing and the other going the to pivot for the wing to circle, ...
1
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1answer
70 views

How do Test Indicator Flexible Holders hold rigidly when tightened?

If one were to search on Amazon for "Test Indicator Flexible Holders" you will turn up many items using this mechanism (please ignore the magnetic base; I'm not focusing on that part, just the red ...
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0answers
777 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 ("...
1
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1answer
35 views

Do crank-sliders require some minimum amount of momentum to work in linear-to-rotary convertions?

I've been doing some reading into spinning wheels and old-fashioned sewing machines and so far as I can tell, they use a system similar to a piston in an engine. The main difference being, the ...
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1answer
56 views

Is there a linkage or other mechanism which can simulate a pivot, without extending that far?

I have a bar which I want to move as if it was pivoted on a point beyond its end. e.g. -------- * / / / / Is there a ...
2
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3answers
127 views

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 ...
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2answers
55 views

How could I identify the object in the question body?

We're building this thing in AutoDesk Inventor and SolidWorks, yet I don't know what it is. Can someone please tell me? Thanks.
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1answer
40 views

Did Charles Babbage's Difference Engine use the sautoir carry mechanism from Pascal's calculator?

We know that Blaise Pascal built a mechanical calculator which had a carry mechanism called a sautoir. You can see a video of it working here, and here. We know that Charles Babbage wrote a book ...