Questions tagged [springs]

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What is the purpose of springs in rotor's ventilator/fan

In my lawmower's motor plastic fan/ventilator on rotor has broken to few pieces There are 2 small springs in fan's slots. What is the purpose of these springs? Are there any standards for such ...
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Z-Type Trailing Arm Manufacturing

I'm here to ask a question regarding Z-type trailing arm that's commonly used for air suspension in trucks and trailers. I was given a task to research about this product but I'm having a lot of ...
1 vote
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How do you make custom springs and where could you buy them?

A friend and I are working on a combat robot that uses a special drive. This drive requires a spring with a large wire diameter (over 3mm), a large outer diameter (40-70mm), and a large pitch (60-90mm)...
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1 answer
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How to Calculate Damping Ratio and Natural Frequency of a Mass Spring Damper system, excluding air resistance?

In summary, I need the damping ratio and damped frequency of a system excluding air resistance, as the system will be operating in a vacuum. The system can be modeled as a mass-spring-damper, and the ...
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Strain As A Function of Deflection of a Hollow Cylinder

I should think that there would be a direct correlation of strain to deflection of a hollow thin-walled cylinder, but I've seen nothing as of yet. I must be missing something. For example, let's say I ...
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How to calculate the spring force of a rolled piece of steel?

If you have a steel sheet and then curled it to the point of being a semi-circle with a 30 degree (pi/6) gap from completion (...
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1 answer
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What is this spring known as?

Could anyone tell me what the spring part of this component is called please so I can source something similar?
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6 votes
5 answers
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Could a mainspring be used to generate train acceleration during starting-up from the kinetic energy stored during its slowing down?

When waiting for the underground, I've always been wondering why we could not absorb the kinetic energy of the train to slow it down at the station and then to release this energy to help it ...
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1 vote
1 answer
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How is energy in the hairspring restored in a mechanical watch?

I've read through the excellent guide to how mechanical watches work by Ciechanowski, but it leaves some questions unanswered. The main spring of the watch, when it loses energy, can of course be re-...
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Spring loaded quad blade

I'm wanting to see if it is possible to create a functional prop that includes two blades that spring out creating a circular quad blade. 2 blades would be fixed at opposite ends of the circular ...
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Design of the parameter of a transfer function so that output can reduce to zero

Here is a transfer function. $$G_2(s) = \frac{Y(s)}{F(s)} = \frac{M_1s^2+K_1}{(99s^2+30000+K_1)(M_1s^2+K_1)-K_1^2} = \frac{M_1s^2+K_1}{99M_1s^4+(99K_1+30000M_1+K_1M_1)s^2+30000K_1}$$ The output to the ...
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1 answer
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Manual/Electrically controlled loaded spring release for door kick-down stopper

Hoping to upgrade this or similar telescopic door kick-down stopper to release the stopper remotely. Wondering if there are standard solutions that would allow for electrical and manual loaded spring ...
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3 answers
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What is the difference between Hooke's Law and Young's Modulus?

In the elastic region where stress is proportional to strain up to elastic limit which is we call Young's Modulus (E). My question is if that is E, then what is Hooke's Law (K=F/x spring stiffness). I ...
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2 answers
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Net force exerted by spring

I want to find the exact net force exerted by the spring between pt. P and C, when it is compressed till point P with some mass, m attached to it and released (assuming spring goes to pt. C after its ...
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-1 votes
2 answers
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How can I find stiffness of a steel coil spring used in dump trucks?

How can I find stiffness of a steel coil spring used in dump trucks? Here is the data of the question. Length of spring unloaded = 220mm Outer Diameter = 27mm Inner Diameter = 15mm Wire Diameter = 6mm ...
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1 answer
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Vector homework problem [closed]

This is a question from Engineering Mechanics by Shames. I am unable to resolve this as the question mentioned.
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1 answer
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How much force needs to be applied on a battery cell to maintain contact?

I'm designing a battery case for cylindrical li-ion batteries similar to the AA battery cases. We need to avoid spot welding to the cell directly since we want may need to replace some cells later for ...
1 vote
4 answers
108 views

Can someone please explain how impact is absorbed?

I am unable to understand how springs and shock absorbers absorb impact. So it would be great if someone could explain how impact is absorbed; and if it could be used to protect someone's leg from ...
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2 answers
198 views

How to draw a free body diagram of a cylinder under torsion?

What is the correct way to draw a free body diagram (FBD) for the following cylinder? Assume the cylinder and disc have been twisted to an angular deflection of $\theta$. Further assume that we are ...
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Deflection of Cantilever Beam with Midpoint Spring, Integration and Superposition Methods

How can I get the deflection required below using 1) the Integration and 2) Superposition methods (two ways)? The beam $AB$ is supported by a spring $CD$, which is fixed at $C$ with constant $k$, and ...
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Inertial Force expression in spring

Let there be a spring as shown. And this is stretched to point C and released, then force exerted by spring on mass in region X2 is "- kx" . But This springs gains kinetic energy at mean ...
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1 vote
2 answers
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What is this type of detent mechanism called?

I'm trying to find out what this common rotary detent mechanism is actually called. I see them in all sorts of cheap plastic toys, and I'd like to see if I can find them for sale, but I don't know ...
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Die springs for heavy 3d printer bed

I have a 3d printer with a pretty heavy bed. Its dimensions are roughly 24"x24" & 0.25" thick Mic6 aluminum. I need to get some springs for the bed leveling, but my system requires ...
4 votes
2 answers
147 views

What is the purpose of dead coils in the middle of a compression spring?

What purpose do dead coils in the middle of a spring serve? For example, this spring from a ballpoint pen has two dead coils at each end and two in the center of the spring. Why add dead coils in the ...
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3 votes
4 answers
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How can you make a solid box jump up with no external forces?

Let's say I have a box lying on a flat surface. Inside the box, I make a heavy mass hang from a spring attached to the top of the box. If we pull the mass all the way down and let it go, I believe it ...
5 votes
6 answers
1k views

Mechanical mechanism that regulates gear's rotational velocity

Please do note that I am a civil engineer not a mechanical engineer. I have a gear that rotates at a speed that varies with time. Usually, it rotates at speeds higher than the desired speed. Is there ...
3 votes
2 answers
78 views

Reverse Suspension Spring

So, in a car either a liquid or a gas gets compressed when force is applied to the suspension, and when the force is removed the gas/liquid tries to expand again which makes an effect like a spring, ...
1 vote
1 answer
210 views

How to build an Adjustable Tension Spring?

Is there such a thing as an off-the-shelf adjustable tension spring? I've searched extensively without success. The problem I'm trying to solve is as follows: I have a tension spring hanging from a ...
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Effect of area spring at slab on column

Say that a simple building is supported by 4 columns , the column sitting on base slab. I assigned some sort of area spring to the base slab. When the area spring assigned is higher, this cause the ...
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2 answers
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Difference between Hydraulic cylinder and spring

What is the technical difference between a hydraulic cylinder and a spring? For sure, I understand their principles but I wonder about physical-technical differences. For example, the most obvious ...
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3 answers
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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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3 answers
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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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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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1 vote
2 answers
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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 votes
1 answer
53 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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2 votes
0 answers
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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 \...
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1 answer
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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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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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0 answers
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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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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 vote
1 answer
1k 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 ...
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2 answers
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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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1 vote
2 answers
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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 vote
1 answer
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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, ...
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1 answer
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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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1 answer
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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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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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1 vote
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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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1 answer
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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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1 answer
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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 ...