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Questions tagged [springs]

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0answers
27 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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0answers
52 views

Eigen-Modes for a homogenous, non-conservative mechanical system

$$ M\,\ddot{y}+D\,\dot{y}+K\,y=0\\ y=\begin{bmatrix} y_1&y_2&\cdots&y_f \end{bmatrix}^\top\\ M=M^\top>0,\quad D=D^\top,\quad K=K^\top\geq0 $$ Equations show a homogeneous non-...
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2answers
60 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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0answers
54 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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0answers
35 views

How to run response spectrum for members with compression only spring in MIDAS

When running a structural model supported on footings with compression only springs, I encountered tension reaction forces in the springs. This occurs when running seismic load case using response ...
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1answer
27 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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0answers
297 views

Equivalent spring of beam supported by springs

My professor gave us yesterday a problem to calculate the equivalent spring of the system shown in the attached figure. The problem: a cantilever beam supported by two springs $k_1$ and $k_2$ located ...
1
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1answer
225 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 ...
3
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1answer
78 views

Quick release for spring-loaded rod

I have some doubts about a quick-release mechanism that I'm working on and I'd like to run it by you. I have hollow tube in which there's a spring-loaded rod. Part of it is made wider and there's a ...
2
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1answer
145 views

Are spring constant and rate constant the same thing?

I am shopping for a spring on McMaster and there is a quantity listed as "rate constant". Is this the same thing as spring constant? If so, what are the units of this value? (lbs/in, lbs/ft, other)?
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0answers
83 views

Sd Card Like (Action Spring Loaded Eject Mechanism) But Larger. How To Find Such Components(Manufacturing Sellers/Sources)?

I got interested in how small and effective the locking mechanism is on the micro sd card slot, (although it breaks after much usage, that's why Raspberry PI 3 abandoned it to a non spring loaded slot)...
3
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2answers
147 views

Specification of linear speed dampers

I'm looking at linear compression dampers and finding them most commonly specified only with a "Max Force" – e.g., 270 lbs. However, since the damping mechanism is provided by hydraulic or pneumatic ...
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1answer
41 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 ...
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1answer
59 views

Load per deflection of springs [closed]

I am working on a project using springs. What is the maximum load per deflection of springs available in market?
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0answers
49 views

Anglepoise mechanism - practical springs

I'm trying to make an anglepoise type 'equilibrator' mechanism for a small microscope. I'm reading this analasys http://eprints.lancs.ac.uk/20295/1/20295.pdf and having trouble finding a spring with ...
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3answers
78 views

Why are automotive brakes set inside the wheels, and not on the axles?

In most (maybe all?) automobiles, the drum or disc brakes are positioned at the end of the axles, inside the wheel. This increases unsprung mass, which reduces handling performance. Would it not be ...
0
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1answer
165 views

Does kevlar (composite materials ) have elasticity?

Can we use kevlar, a composite material in leaf springs. I mean does it have the properties which are essential for a leaf spring (like resistance to bending, elasticity) if it has, are(properties) ...
0
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1answer
456 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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1answer
151 views

Finding the diameter of a material using tension stiffness and Young's Modulus

This question is similar to a question I am stuck on, but I have changed it to get an understanding how to works. A spring is being made by pulling a 12cm long cylinder of material in tension with a ...
3
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3answers
90 views

Spring-like device with anisotropic k value

Is there a device that acts like a spring (i.e. $F=kx$) but the spring constant, $k$, has different values in compression and tension? For example, if $k_c > k_t$ (where c and t refer to ...
0
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2answers
99 views

How would I calculate a force on a spring? Or more specifically the weight of an object that spring is supporting

I am trying to create a simulation for car suspension and tyre physics and to do the tyre physics I need to know how much weight is over the friction point that is under the spring.
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1answer
1k views

What affects the spring constant or spring life spans?

What factors would degrade a spring's life span other than stress applied? Will high cycles (e.g. 100k load-unload continuous cycles) and high speed (100 ms/cycle), affect the spring constant (k)? ...
4
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2answers
527 views

Difference between a spring's k-value and rate constant?

As everyone learns in physics class, Hooke's law states that a spring's force is proportional to the distance it is stretched/compressed. The constant of proportionality is usually referred to as $k$....
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1answer
126 views

Spring Diameter Question

Aluminum 6061-T6 has a density of 2.7 g/cm^3, a Young's modulus of 69 GPa, and an ultimate tensile strength of 310 MPa. If a "spring" were to be made by pulling a 10cm long cylinder of material in ...
6
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2answers
2k views

How to calculate tensile strength of braided steel wire?

I am working on project involving designing a recoil spring coil of diameter 10.2 mm and wire diameter 1.25 mm. I tried using a solid core wire but it failed due inadequate tensile strength. ...
2
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0answers
63 views

Modifying coil spring to alter rate progressively

I want to modify the coil springs in my car to lower it 1" without raising the spring rate, so simply trimming the overall length is not an option. My idea is to remove material from along the top ...
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4answers
546 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 ...
2
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0answers
167 views

Designing a clamping mechanism for linear sliding stick

the problem I'm prototyping for a musical instrument based on sliding sticks (see https://vimeo.com/170450482) but I'm struggling to make a robust, yet smooth clamping mechanism for the sticks. The ...
1
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3answers
121 views

Material for suspension that stiffens in higher speeds?

I was hoping there exists a material like hard rubber used in bushings, but has the property to stiffen when exposed to vibration with high frequency. So, my application is something like a small ...
1
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0answers
113 views

“Click” mechanism

I have an application in which I need to detect a button press on top of a platform which has a load (0.2kg ~ 0.5kg). The press is executed on the load. Ideally I think what want is a tactile button ...
6
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6answers
3k 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 "...
0
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1answer
52 views

Wave torsion spring?

I'm building a catapult and I asked a question and got this response. Is there an equivalent for the wave spring but for angular motion like a torsion spring? Or any improved design on the torsion ...
2
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0answers
77 views

What type of spring is used in this antique receipt holder?

Pictured is an antique McCaskey Register Co Receipt Holder. I have tried to find a modern equivalent, but I have not had much luck. I am considering building my own, is the spring used a readily ...
2
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1answer
538 views

Would a double helix spring be more or less effective than two springs?

Say I have a spring in the shape of the backbone of DNA. If I unwind the two parts which would have more potential energy when pushed all the way down, the double helical or both of the individual ...
1
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0answers
52 views

Are there design reasons why there aren't pneumatic pistons for chairs with a stroke >= 400 mm?

In the interest of saving space, I'd like to have a stool that can double as a table. I'd like the height to be adjustable from 16 inches to 32 inches. But I can't find any pneumatic/spring piston ...
1
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0answers
319 views

Deriving relationship between LVDT and mass spring damper

I have this system below. It is the schematic of a linear accelerometer moving horizontally, where $m$ is the total mass of the slide, $b$ denotes the viscous damping, and $k$ represents the spring ...
1
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2answers
176 views

How do the springs really work in my design?

I'm designing a machine to test a static object (I'll refer to it as A)'s resistance to deflection due to impact force. This design uses a pneumatic(probably wont be using hydraulic) cylinder to ...
4
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1answer
47 views

How does non-electrical ATEX apply to springs?

This question relates to the ATEX directive, which is the European regulation governing the design of products to be used in explosive atmospheres. In particular, I am asking about the part relating ...
2
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4answers
328 views

What is the Technical Term for this kind of slot?

I am looking for the technical term which describes the kind of slot one finds commonly in modern phones to hold SIM cards. More specifically, what does one call a slot that one pushes the SIM card ...
5
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2answers
796 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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3answers
207 views

What is the [PVC] tube or foam in metal springs for?

There are plenty of springs out there which have either a little PVC tube or a foam inside, when I first saw the tube I thought it was probably to prevent the metal spring from bending, but that ...
3
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4answers
1k 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 ...
3
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2answers
191 views

Spring - Piston with different extension and compression rate

I am in need of a device that extends freely without much resistance but compresses slowly. I can provide a door closer analogy.The door should open fast but close slowly.... Do you think this can be ...
0
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2answers
558 views

What is the simplest spring system that could produce recoil absorption comparable to that exhibited by the AA-12 assault shotgun?

In this video, the video emphasises the very low recoil level of the AA-12 fully automatic shotgun. In particular, at this point in the video the presenter uses one hand to relatively lightly grip the ...
3
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2answers
86 views

Dominant parameters in the dynamical response of a linear oscillator

I am working with a very simple 3-DOF damped LTI spring-mass system. As an exercise I am altering two parameters simultaneously (stiffness and damping coefficients connecting mass 1 to mass 2) to see ...
3
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1answer
410 views

How much force does a lock's pin have due to the spring?

I found this gif, and I was wondering how much force is applied on the pin due to the spring from the top? Also, is there an industry standard for the amount of force exerted?
4
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1answer
3k views

How is the long-term creep of a spring determined?

Spring Design In spring design, there a a variety of parameters to consider. Some of the parameters are solely physical (wire diameter, coil diameter, length, etc.) and some are determined from the ...
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3answers
2k views

What kind of spring exerts a constant force but is also adjustable?

I'm trying to make a lifting mechanism that will support variable weights, similar to this product: http://www.humanscale.com/products/product.cfm?group=quickstand On the quickstand there is a screw ...
10
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1answer
355 views

What are the lightest springs?

I am wondering if there is a spring strong enough and light enough to inflate an airtight membrane so that it floats at Standard Temp & Pressure. As an example, a 10cm cylinder would displace ...