Questions tagged [springs]

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1answer
45 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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3answers
84 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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0answers
65 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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3answers
80 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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1answer
56 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 ...
3
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1answer
90 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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2answers
52 views

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 ...
2
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0answers
57 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 \...
0
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1answer
41 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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2answers
23 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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9answers
6k views

Why aren't counterweights used more for garage doors?

One of my garage door torsion springs broke again. It makes me wonder why some sort of counterweight system isn't used instead. Torsion springs seem to have a 90 day warranty generally and are "...
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0answers
39 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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0answers
21 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 ...
1
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1answer
242 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 ...
0
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2answers
54 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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2answers
2k views

Transfer Function of Spring-Damper System

Given the spring-damper system below where $x_i$, $x_i$, and $y_i$ are position values, how do I find the transfer function $\frac{X_o(s)}{X_i(s)}$? Wouldn't it require mass? I tried neglecting the ...
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2answers
761 views

why springs get harder to compress?

I was playing with a spring, and realized that I've never wondered why a spring gets harder and harder to compress the more you try to compress it. It seems easy at first though. What is the ...
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2answers
216 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 ...
1
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1answer
37 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, ...
0
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1answer
57 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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1answer
67 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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1answer
44 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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0answers
37 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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0answers
21 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 ...
1
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1answer
41 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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3answers
279 views

Spring degradation in hand grip trainer

Consider a spring like this (this one CoC hand gripper): They claim on their web site, that the spring will not degrade during time: Do your grippers get weaker with time? No, so don’t worry if ...
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8answers
4k 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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1answer
23 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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1answer
52 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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2answers
62 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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0answers
61 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 ...
4
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0answers
72 views

Equation for the spring constant of an orthotropic, rectangular wire spring

I hope I can get some help with this problem as I've been struggling with it for a long time. I have a helical tension spring with radius $R$ and a square wire cross section and made of orthotropic ...
2
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1answer
32 views

Spring Industry Naming Convention

I am currently prototyping a part for a personal project. My CAD design was contracted out and there are some off the shelf parts that I need to order per the design (springs, screws, etc.). My ...
3
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1answer
560 views

Torsional rigidity D vs torsional rigidity factor k vs torsion constant J

I have a physics background so apologize my ignorance. I'm confused by the constants $D$, $\kappa$, and $J$ when it comes to torsion of beams. From what I understand $\kappa$ and $J$ are the same ...
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2answers
51 views

shock absorbing rigid joint

There is this problem I can't figure out. One measurements wheel needs to be attached to a slowly moving but wildly shaking and twitching construction machinery. I am trying to greatly absorb the ...
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0answers
28 views

A creep mathematical model of alloy steel for making springs

I'm searching for a mathematical approach to well describe the creep (or stress relaxation)of helical-coil compression spring.I've got the spring parts and can Experiment with these parts .I need ...
0
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2answers
111 views

Dynamic spring tension [closed]

I have rope on a spool that is on a cart that is powered and moving at a constant velocity of 0.5 m/s. The end of the rope is passed thru a break and fixed to the wall. one break has a compression ...
0
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1answer
115 views

Moment of Inertia of a Rotor System

I need to settle a discussion on the following question: Part A: Find the equivalent spring constant for springs in series Use equations of motion, sum of torques to find natural frequency of the ...
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2answers
192 views

Convention for spring symbols with lateral force

If you draw a diagram with a spring, is there any convention about how it should behave with lateral loads? I guess it might be either: Rigid Free Elastic with bending and/or shear stiffness Pin ...
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0answers
116 views

Equations of motion for a motor supported by a spring resting at the centre of a beam

Assumptions from this: Sum of forces on the beam to be calculated Sum of moments on the beam to be calculated Sum of forces on the motor to be calculated As: F=-kx = kθL^2 Equations of Motion ...
3
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3answers
796 views

How to push an endoscopic camera upto 20 meters in a horizontal pipe?

I have a small endoscopic camera (custom made). I wanted to push the camera inside a horizontal pipe of dimensions varying from (25 mm to 65 mm ID). But the wire attached to the camera is not stiff ...
1
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1answer
577 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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2answers
2k views

Is strain energy the same as potential energy, or something differen?

Sorry for this stupid, basic question. But I got hung up on it. We know from Clapeyron's theorem that the strain(internal) energy of an elastically deformed body is equal to half the work $$ U=\...
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0answers
41 views

What are typical manufacturing constraints when producing (conical) springs?

Small background: for a project of mine I need to develop a (very light) conical spring. While there are plenty resources out there for regular springs I really struggled to find anything on conical ...
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4answers
1k views

How does load force impact load inertia?

I am trying to simulate a winch as a speed-regulated motor that works through a gearbox to lift a mass. The output of the gearbox is a drum, which rotates to accumulate cable. I feel comfortable ...
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0answers
62 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
1k views

Calculating pretension of a spring with an initial tension

Simple one. Some extension springs are wound with an initial tension which acts to pull the coils together, even when not under external loading. When calculating the preload in the spring, should ...
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1answer
55 views

Will including spring inside the swivel hooks used in duffel/messanger bags help?

so my question is, if a swivel hook used in duffel bags has spring inside for compression, then would it help to reduce the weight on our shoulders when we are running around airport with bag hung on ...
5
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2answers
2k views

Metal spring thermal expansion

I am attempting to figure out why a laser layout tool I have is drifting over time. It was designed with a small adjustment mechanism that relies on a spring to apply pressure to a fulcrum that ...
3
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4answers
2k views

Rotary energy storage mechanism

With a normal spring, you compress it using a linear force to store energy and then it decompresses and releases the energy, again in a form of linear force. Is there a mechanical mechanism that ...