# Questions tagged [springs]

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### 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 ...
423 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) ...
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 ...
2k 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 ...
111 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 ...
349 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.
2k 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)? ...
1k 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 $k$....
165 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 ...
6k 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. ...
127 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 ...
1k views

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 ...
303 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 ...
125 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 ...
298 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 ...
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 "...
81 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 ...
92 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 ...
947 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 ...
60 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 ...
507 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 ...
241 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 ...
71 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 ...
445 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 ...
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 ...
301 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 ...
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 ...
298 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 ...
808 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 ...
97 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 ...
821 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?
4k 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 ...