Questions tagged [springs]
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84
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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 ...
0
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1answer
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) ...
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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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1answer
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 ...
2
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3answers
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 ...
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2answers
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.
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1answer
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)? ...
3
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2answers
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 $k$....
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1answer
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 ...
6
votes
2answers
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. ...
2
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0answers
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 ...
9
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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 ...
2
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0answers
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 ...
1
vote
3answers
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 ...
1
vote
0answers
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 ...
8
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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 "...
0
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1answer
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 ...
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0answers
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 ...
2
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1answer
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 ...
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0answers
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 ...
1
vote
0answers
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 ...
1
vote
2answers
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 ...
4
votes
1answer
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 ...
2
votes
4answers
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 ...
5
votes
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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3answers
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 ...
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 ...
3
votes
2answers
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 ...
0
votes
2answers
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 ...
3
votes
2answers
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 ...
3
votes
1answer
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?
5
votes
1answer
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 ...
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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 ...
13
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1answer
687 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 ...
