Questions tagged [springs]

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5 answers
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Could a mainspring be used to generate train acceleration during starting-up from the kinetic energy stored during its slowing down?

When waiting for the underground, I've always been wondering why we could not absorb the kinetic energy of the train to slow it down at the station and then to release this energy to help it ...
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1 vote
1 answer
47 views

How is energy in the hairspring restored in a mechanical watch?

I've read through the excellent guide to how mechanical watches work by Ciechanowski, but it leaves some questions unanswered. The main spring of the watch, when it loses energy, can of course be re-...
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0 votes
0 answers
18 views

Spring loaded quad blade

I'm wanting to see if it is possible to create a functional prop that includes two blades that spring out creating a circular quad blade. 2 blades would be fixed at opposite ends of the circular ...
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0 votes
0 answers
18 views

Design of the parameter of a transfer function so that output can reduce to zero

Here is a transfer function. $$G_2(s) = \frac{Y(s)}{F(s)} = \frac{M_1s^2+K_1}{(99s^2+30000+K_1)(M_1s^2+K_1)-K_1^2} = \frac{M_1s^2+K_1}{99M_1s^4+(99K_1+30000M_1+K_1M_1)s^2+30000K_1}$$ The output to the ...
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0 votes
1 answer
23 views

Manual/Electrically controlled loaded spring release for door kick-down stopper

Hoping to upgrade this or similar telescopic door kick-down stopper to release the stopper remotely. Wondering if there are standard solutions that would allow for electrical and manual loaded spring ...
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  • 103
0 votes
3 answers
131 views

What is the difference between Hooke's Law and Young's Modulus?

In the elastic region where stress is proportional to strain up to elastic limit which is we call Young's Modulus (E). My question is if that is E, then what is Hooke's Law (K=F/x spring stiffness). I ...
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0 votes
2 answers
42 views

Net force exerted by spring

I want to find the exact net force exerted by the spring between pt. P and C, when it is compressed till point P with some mass, m attached to it and released (assuming spring goes to pt. C after its ...
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  • 11
-1 votes
2 answers
68 views

How can I find stiffness of a steel coil spring used in dump trucks?

How can I find stiffness of a steel coil spring used in dump trucks? Here is the data of the question. Length of spring unloaded = 220mm Outer Diameter = 27mm Inner Diameter = 15mm Wire Diameter = 6mm ...
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0 votes
1 answer
56 views

Vector homework problem [closed]

This is a question from Engineering Mechanics by Shames. I am unable to resolve this as the question mentioned.
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0 votes
1 answer
44 views

How much force needs to be applied on a battery cell to maintain contact?

I'm designing a battery case for cylindrical li-ion batteries similar to the AA battery cases. We need to avoid spot welding to the cell directly since we want may need to replace some cells later for ...
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1 vote
4 answers
79 views

Can someone please explain how impact is absorbed?

I am unable to understand how springs and shock absorbers absorb impact. So it would be great if someone could explain how impact is absorbed; and if it could be used to protect someone's leg from ...
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0 votes
2 answers
102 views

How to draw a free body diagram of a cylinder under torsion?

What is the correct way to draw a free body diagram (FBD) for the following cylinder? Assume the cylinder and disc have been twisted to an angular deflection of $\theta$. Further assume that we are ...
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0 answers
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Deflection of Cantilever Beam with Midpoint Spring, Integration and Superposition Methods

How can I get the deflection required below using 1) the Integration and 2) Superposition methods (two ways)? The beam $AB$ is supported by a spring $CD$, which is fixed at $C$ with constant $k$, and ...
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  • 5
0 votes
2 answers
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Inertial Force expression in spring

Let there be a spring as shown. And this is stretched to point C and released, then force exerted by spring on mass in region X2 is "- kx" . But This springs gains kinetic energy at mean ...
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0 votes
2 answers
159 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 ...
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0 votes
0 answers
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Die springs for heavy 3d printer bed

I have a 3d printer with a pretty heavy bed. Its dimensions are roughly 24"x24" & 0.25" thick Mic6 aluminum. I need to get some springs for the bed leveling, but my system requires ...
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4 votes
2 answers
105 views

What is the purpose of dead coils in the middle of a compression spring?

What purpose do dead coils in the middle of a spring serve? For example, this spring from a ballpoint pen has two dead coils at each end and two in the center of the spring. Why add dead coils in the ...
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  • 363
3 votes
4 answers
133 views

How can you make a solid box jump up with no external forces?

Let's say I have a box lying on a flat surface. Inside the box, I make a heavy mass hang from a spring attached to the top of the box. If we pull the mass all the way down and let it go, I believe it ...
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5 votes
6 answers
1k views

Mechanical mechanism that regulates gear's rotational velocity

Please do note that I am a civil engineer not a mechanical engineer. I have a gear that rotates at a speed that varies with time. Usually, it rotates at speeds higher than the desired speed. Is there ...
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3 votes
2 answers
63 views

Reverse Suspension Spring

So, in a car either a liquid or a gas gets compressed when force is applied to the suspension, and when the force is removed the gas/liquid tries to expand again which makes an effect like a spring, ...
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1 vote
1 answer
118 views

How to build an Adjustable Tension Spring?

Is there such a thing as an off-the-shelf adjustable tension spring? I've searched extensively without success. The problem I'm trying to solve is as follows: I have a tension spring hanging from a ...
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  • 11
1 vote
0 answers
30 views

Effect of area spring at slab on column

Say that a simple building is supported by 4 columns , the column sitting on base slab. I assigned some sort of area spring to the base slab. When the area spring assigned is higher, this cause the ...
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  • 61
0 votes
2 answers
190 views

Difference between Hydraulic cylinder and spring

What is the technical difference between a hydraulic cylinder and a spring? For sure, I understand their principles but I wonder about physical-technical differences. For example, the most obvious ...
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  • 123
3 votes
3 answers
89 views

Common spring materials

I am attempting to determine which material has been used in a spring. I know that the spring is ferrous. However, I would like to know whether the spring would have been heat treated.
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  • 33
1 vote
3 answers
115 views

Axially loaded member with a spring / Mechanic of Materials

i've been struggling with this problem i made up. It is about a cylindrical copper member (diameter $d=20$ mm and length $L=250$ mm) with a spring (stiffness $k=166,5$ kN/mm) fixed on a wall, as the ...
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0 votes
0 answers
71 views

A mechanical system with coupled oscillators and dampers

I found here Coupled oscillators, the last one on this page, a system named by the author "Vehicle Suspension System". But I am not sure this modelizes a suspension for a vehicle. I am ...
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  • 101
1 vote
2 answers
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How to calculate the density of foam required to cushion impacts?

I have a treadmill desk and my downstairs neighbour is complaining about the noise. Specifically the noise made by the impacts of my walking. Unfortunately the floor of my flat is not concrete but ...
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2 votes
1 answer
53 views

Repairing blind in bathroom: How do spiral springs with 3 revolving drums work?

I am trying to repair a plissee blind, that does only fold up until half, then stops, no matter how high you push it. It has a metal-thing holding three metal spirals that can be connected to the ...
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  • 121
2 votes
0 answers
394 views

Advice on spring launcher project

I found an ingenious design of a spring ball launcher on grabcad and I'm interested in adapting it to accelerate a $43.7 \mathrm{~mm}$ diameter, $45 \mathrm{~g}$ golf ball enough to reach $65.5 \...
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0 votes
1 answer
57 views

What would the tension in the cable be?

A subsequent question stemming from here A massless motor is attached to a massless pulley(the blue circle) with a fixed rotational inertia and they are all attached to a mass X (the green platform). ...
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  • 113
0 votes
2 answers
29 views

Sizing a spring

I am attempting to 3D print my own Quad lock mount and require a spring. I've taken some measurements but don't know how to search for where I can buy more springs. Dimensions: 12mm height, 20mm OD. ...
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  • 115
1 vote
0 answers
49 views

How to calculate how much compression is needed for a spring to buckle

First off; School was many years ago and I know little of the mathematics behind all the physics and engineering stuff. So if you have an answer, please explain it like I'm 5? The goal: I aim to be ...
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0 votes
0 answers
76 views

Why aren't elastomer suspensions still used on economy cars?

Classic Mini Coopers used a hollow rubber cone as a combination spring and damper in a pushrod suspension. Why aren't simple elastomer springs still used in cheaper cars? Formula 500 cars use an even ...
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1 vote
1 answer
1k views

How to mechanically attach a compression spring to a flat surface

I am working on a new project right now and I was wondering if anyone had any ideas on how to keep a spring fixed and connected to this flat plastic piece [image shown below]. Our goal is to keep the ...
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0 votes
2 answers
70 views

Choosing a Constant Force Spring

I am trying to decide on a constant force spring to be used in a projectile launcher. The launch velocity will need to be approximately 15 m/s, which, with a barrel travel distance of 1 ft, equates to ...
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  • 49
1 vote
2 answers
418 views

Questions about newton metre units

I have a few values in Newton metres and I need to make sure each value is an SI unit for calculations. However when I try to search for the units I am given, I can only find similar, but not quite ...
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1 vote
1 answer
46 views

What's the name of a device to simulate an object jumping in the air?

I want to make a film of a puppet jumping in the air into the water of a lagoon. I am looking for a pad with a spring release timer that I can bury in the sand so it's out of sight from the camera, ...
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0 votes
1 answer
87 views

Calculate forces/ torques on a parallel spring array

I am stuck on the calculation of forces on a certain system involving parallel springs. The schematic of the system is as follows: The lower plane is fixed and the upper plane movable. There is a ...
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1 vote
1 answer
97 views

Are recoil operated crossbows/ballistae feasible?

This question is specifically about stationary or vehicle mounted crossbows, not man-portable ones The projectile size would measure about 1.8 - 2 meters in length, so the crossbow would have ...
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  • 13
1 vote
0 answers
49 views

Launching a ball with springs or with elastic bands

I’m a student and have to create a machine that can launch a small bowling ball to knock over some pins. I was thinking that I could use elastic potential energy to launch the ball but I’m not sure ...
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1 vote
0 answers
26 views

How do I correctly model this system of torsion springs?

I am currently designing a symmetric parallel mechanism that can be modeled as follows: Here, $\tau^j$ denotes actuator moments and $k_i$ are torsion springs constants. For a specific point in the ...
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1 vote
1 answer
52 views

Help with linear rod drill press like design/materials

I am putting together a basic machine for “pad printing” extremely small and precise parts. The design is very much the same as most homemade drill presses and consists of linear rods, flanged ...
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1 vote
1 answer
37 views

Overextending and cutting a coil spring

This is related to my recent question Can I weaken a coil spring consisting of spring steel?. The answer here could create an additional answer there, but I do not expect that. The difference to that ...
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8 votes
8 answers
6k views

Can I weaken a coil spring consisting of spring steel?

I have a steel coil spring that is used by compression. It is too strong, and I would like to reduce its strength by some fraction, ideally keeping its length. Reducing it to roughly half would be ...
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1 vote
1 answer
204 views

Is the Spring Rate for a Belleville Spring Linear?

Belleville disc springs are usually spec'd with a free height, loaded height, and loaded force. From this information you can calculate the average spring rate of a belleville spring. However, what ...
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0 votes
1 answer
76 views

Arc subtended by stretching of a conical spiral spring

I'm trying to work out the angle subtended by the stretching of a conical spring and I have a solution but I'm not 100% sure about it so would appreciate some feedback. An Archimedes spiral spring is ...
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0 votes
2 answers
120 views

Spring Loaded Pin with Chamfered Pin Finish?

I would like to try out a component that operates like a combination of the two pictures provided - spring loaded pull pin, with a pin finish like a tubular latch (chamfered/filleted finish). Do ...
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4 votes
1 answer
145 views

Is an Adjustable Stiffness Flexure Spring possible?

I have recently discovered flexure springs (see image below), and I am interested in using one in an amateur project I am building. However, I would prefer if I am able to adjust the "stiffness" of ...
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1 vote
0 answers
80 views

Springs on a pulley... When to use?

I saw a machine that fed a sheet of laminate through some rollers. The motor had a pulley attached to its shaft, and a spring connected to the pulley. Why not use a belt? Wouldnt the spring make it ...
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  • 209
1 vote
1 answer
76 views

How are tight coiled springs made

Some tight-coiled springs are made so that they are already under tension - how are they manufactured?
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