Questions tagged [springs]

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1answer
40 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
26 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
34 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
17 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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1answer
30 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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1answer
18 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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8answers
2k 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 ...
1
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1answer
31 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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0answers
17 views

Elastic potential field?

In classic field theory (e.g. electrostatic field theory) a "potential" can be associated to each point of space if we consider how the field interacts with a "test" particle (that is, a particle ...
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1answer
31 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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2answers
39 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
48 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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0answers
34 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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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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0answers
44 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
30 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 ...
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2answers
50 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
26 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 ...
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2answers
102 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 ...
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1answer
81 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
132 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
94 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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1answer
400 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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3answers
534 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
388 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
966 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
39 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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2answers
386 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
61 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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3answers
147 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
2k 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 ...
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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 ...
3
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1answer
332 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
401 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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2answers
297 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
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 ...
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1answer
76 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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3answers
135 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 ...
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1answer
346 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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1answer
1k 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
693 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 ...
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3answers
106 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
189 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)? ...
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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
162 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 ...
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2answers
5k 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. ...
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0answers
107 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
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
279 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 ...