Questions tagged [mechanisms]

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33 views

Push button design for small gadget

I'm looking at designing a small gadget (think something like a Fitbit in size) where the case has a couple of buttons on it. For various reasons the buttons have to be around the narrow side (edge) ...
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1answer
24 views

Whats the correct name for the filament driving mechanism used in 3d printer extruders and MIG wire feeders?

Looking for the correct terminology to for the cable/filament feeding mechanism used in 3d printer filament feeder where the filament is gripped between a bearing and a gnarled gear tooth driven by ...
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1answer
49 views

what is the degree of freedom of a pair of gear wheels?

Two gear wheels A and B are touching each other and they can rotate about fixed points P and Q respectively. how to calculate the degree of freedom of the system by using gubbler's equation?
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49 views

What mechanism do I use for this pen-like design?

I am trying to make a pen-like product that moves out fluid from its tip for some special chores, but I am having issues about the motion of the clutch. The picture you see is a sectioned concept ...
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1answer
48 views

When designing scissors, how do you design the blade geometry to ensure good cutting capabilities?

I have been looking online and found there should be two points of contact, one in the blades and one in the pin. In order to achieve this, I assume there's a slight angle of the blades into the ...
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1answer
70 views

Ackerman steering

I'm designing a steering mechanism following the Ackerman principle. I've met the condition that my steering arms' normal projections must cross in the middle of the rear axle however when I do a turn ...
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1answer
20 views

Motorized 4 part extension column mechanism?

I'm a programmer working on a project where we will be controlling a crane's boom for motion control. We are currently a year out from having the actual crane in house, but are doing the software ...
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1answer
45 views

Bevel gear design & usage

The problem : I need to create a mechanism with 2 parallel shafts, at some distance apart, rotating in the same direction, either clock- or anticlock-wise. The distance (> 1m) makes it impractical to ...
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2answers
67 views

What are these parts on these Soviet tanks?

I'm sorry if this is not the right site but I really don't see another more suitable on Stack Exchange. Some Soviet tanks have these canister-looking things that hang down off the sides of the hull, ...
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1answer
29 views

Whats a reliable way to measure the amount of rope going out of a coil?

I am an undergraduate researcher and I am working at enhancing a calibrating system for a hydrographic surveying system that my supervisor uses on his hydrography course. The rope is used to lower a ...
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1answer
96 views

Why is there still no truly omnidirectional treadmill? (technical reasons)

Disclaimer: I'm not a (device) engineer. I don't know the terminology. So I suppose some of my statements, questions or ideas could sound either naive or vague. As far as I undestand, the most ...
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1answer
34 views

Off-center hinge construction

I want to build a monitor supporting arm for three monitors besides each other. The outer monitors shall be able to swivel forward to reduce size of the whole thing when not in use. My problem's that ...
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0answers
29 views

How to design a coaxial 1:2 gear without reversing direction?

I am trying to design a gear that has a 1:2 speed ratio (input:output). This design is very limited in space and for simplicity and space savings requires the input and output shafts to be coaxial. ...
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0answers
27 views

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. ...
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1answer
61 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 ...
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49 views

Rotating and locking shaft 180 degree hinge, spindle or shaft mechanism?

Does anyone know the proper name for these other than hinge? They are rotary shafts that appear to be in a spring loaded housing, that spin 180 degrees in their housing and lock extremes by what ...
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4answers
85 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 ...
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1answer
28 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 ...
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1answer
40 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 ...
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2answers
86 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 ...
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1answer
31 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 ...
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2answers
171 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 ...
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1answer
57 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 ...
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1answer
47 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 ...
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0answers
67 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 ...
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0answers
26 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 ...
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1answer
308 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 ...
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1answer
258 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 ...
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1answer
39 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 ...
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1answer
82 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 ...
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1answer
122 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 ...
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1answer
30 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.
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1answer
24 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 ...
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3answers
186 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 ...
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1answer
79 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 ...
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1answer
79 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 ...
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0answers
36 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 ...
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0answers
55 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 ...
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1answer
128 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 ...
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1answer
96 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 ...
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1answer
86 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 ...
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1answer
739 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 ...
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1answer
41 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 ...
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1answer
35 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 ...
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3answers
141 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 ...
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1answer
201 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 ...
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2answers
34 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 ...
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1answer
150 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 ...
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1answer
46 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 ...
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1answer
36 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 ...