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Questions tagged [springs]

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How to shoot things with springs?

I am a just begining self-taught in the art of engineering and I am trying to make a thing that shoots things like a gun, but instead of a chemical reaction, I want to shoot it with something ...
Something to shoot's user avatar
1 vote
0 answers
21 views

LPHow do I put the springiness back into a steel rod

This is a piece of steel rod, from a clock, 100mm x 1.5mm. The mechanism is 200 years old and the steel has gone soft and lost its recoil.
Simon Stevens's user avatar
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0 answers
14 views

How does an impact driver hammer and spring mechanism cam backwards when loosening fastenings?

For an electric impact driver / impact wrench, how does the hammer mechanism cam backwards and forwards? In reverse (loosening fastenings), the spring twisting would cause spring extension, not ...
Cedric's user avatar
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3 votes
1 answer
203 views

What are the benefits of using a spring as a drive screw in this electronic deadbolt?

The Schlage FBE365 electronic deadbolt uses a DC motor attached to a helical screw to raise and lower the C-shaped piece shown. The way the rest of the mechanism works is not important for this ...
Ryan's user avatar
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0 answers
16 views

Spring compression and quick release mechanism

I'm in a group and we're designing a wheel that can inflate and decompress using springs. The purpose of the string compression/decompression is to give our tires this jumpy/bouncy like movement. ...
Jelan Womack's user avatar
0 votes
1 answer
59 views

Force Required To Stop A Freely Rotating Wheel With Attached Falling Object With A Spring

I have a wheel with a diameter of 2m and a weight of 67kg. The wheel has a radius of gyration of 0.82m. From this wheel a weight of 35kg is suspended. The weight will fall for 10m and accelerate the ...
Mecky's user avatar
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0 votes
0 answers
16 views

Energy conservation on SHM in springs

In the above spring block arrangements, the time period is asked for $K_1=2K$ left spring and $K_2=K$ right spring. Now at equilibrium, $$T=K_2x=Kx=mg$$ $$2T=K_1y=2Ky=2mg \implies x=y$$ for movable ...
Betelgeuse's user avatar
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0 answers
30 views

How can I size air springs?

I am building a wagon for carrying heavy loads of up to 2000 lbs over uneven ground. It has 6 wheels each rated at 615 lbs capacity and a 4x8 foot bed. I am planning to use air springs to give each ...
Wallace Park's user avatar
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0 votes
4 answers
46 views

Why does restoring force of a spring vary directly with elongation or compression?

The restoring force is electromagnetic in origin, having to do with atomic/molecular interactions. Both electrostatic as well as magnetic forces vary inversly with the square of distance. $F_{_{EM}}\...
Nietsniewton's user avatar
0 votes
0 answers
15 views

Squeeze Force for Anodizing Apparatus

I have an anodizing rack that has hundreds of prongs. These prongs are made of titanium and need to be squeezed together in order to place the parts on the rack. I am wondering how I would calculate ...
Jack Duffy's user avatar
0 votes
1 answer
87 views

What does squared end spring mean?

What does squared end spring mean? In most cases I have seen shown closed and squared springs where the last coil touches the previous one. But it seems that squared end means that the end is flat, ...
user5507535's user avatar
0 votes
1 answer
33 views

What happens while skewing a spring?

I'm trying to design this magazine spring in CAD: But this spring should be skewed: When designing the spring, there's one problem, one "leg" would need to be longer than the other for the ...
user5507535's user avatar
0 votes
0 answers
17 views

Spring making machines

There's lots of videos of high-speed spring making machines floating around e.g. YouTube, typically taking wire stock of up to a millimeter or so in diameter and producing items which are clearly ...
Mark Morgan Lloyd's user avatar
2 votes
3 answers
87 views

How are springs that are designed for 100% extension different for ones that are designed for 60% extension?

Some trampoline springs extend only 40-50% before reaching their elastic limit. (e.g. a 10 inch spring can extend to 14 or 15 inches. Good springs can extend to 100% (E.g. a 10 inch spring can ...
Sherwood Botsford's user avatar
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0 answers
33 views

Passive mechanical system to direct force and displacement into different ropes - Can this even be? (Mechanical transistor with direct actuation)

In this question I'd like to ask wether it is possible in general to build the following device. I don't come from an engineering background, so I'm probably not using the right words, but I'll try to ...
Quantumwhisp's user avatar
0 votes
1 answer
97 views

Spring constant of angled beam

I'm trying to solve for the dynamics of three blocks, shown below. Two blocks are pushed into a central shuttle, and their force is transmitted through a thin angled beam/pawl. The pawl bends when ...
asyndeton256's user avatar
1 vote
1 answer
51 views

Remove slack from geared stepper - without touching the gearbox?

I have a Nema 11 stepper motor with a planetary gearbox and think it is a great stepper motor for a project I'm trying to do. One thing I noticed is that the output shaft of the gearbox has some ...
ulix's user avatar
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1 vote
1 answer
80 views

What wire are mechanical keyboard switch compression springs made of?

What specific wire is used for mechanical keyboard switch compression springs? I am trying to create my own mechanical keyboard switch springs, I have tried stainless steel dental wires but it does ...
user42004's user avatar
0 votes
0 answers
118 views

Need help in understanding torque and Spring Force

I have another question for the smart people on here!! I am working on a project and I need a better understanding of the forces. I have a torque applied from a torque driver of 0.7 Nm to screw down a ...
boo-fun's user avatar
1 vote
5 answers
75 views

Describing 180 degree arcing/deflection of wire supported vertically at one end

I am trying to understand how to describe and calculate the shape a length of piano wire makes from its own weight when supported vertically at only one end. Is it a catenary or a parabola? ...
Rafe Copeland's user avatar
0 votes
1 answer
74 views

Distributing force over multiple springs evenly

I am trying to build a big push button in the shape of a rectangle. I have 4 springs at each corner (below the plate), but the problem is, that because of button's size, if I press down on one of the ...
Adam's user avatar
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0 votes
1 answer
71 views

Mechanical solution for engaging and disengaging an idler gear to output gear

I am building a conveyor lift to send cut plywood (4ft x 8ft x 40mm) into a 20-tier conveyor rack. I would like my conveyor motor to be on the conveyor lift only. I need the conveyor motor to drive ...
Edmund Ong's user avatar
0 votes
1 answer
205 views

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 ...
voldi's user avatar
  • 101
1 vote
0 answers
47 views

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)...
Daniel T. Simpson's user avatar
0 votes
1 answer
340 views

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 ...
Casper's user avatar
  • 1
0 votes
2 answers
74 views

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 ...
Chris's user avatar
  • 1
0 votes
0 answers
161 views

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 (...
zealousProtoype 's user avatar
0 votes
1 answer
69 views

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?
Pyy's user avatar
  • 103
6 votes
5 answers
3k views

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 ...
Noil's user avatar
  • 182
0 votes
1 answer
244 views

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-...
Eugene Osovetsky's user avatar
0 votes
1 answer
34 views

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 ...
alex's user avatar
  • 103
0 votes
3 answers
3k views

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 ...
Ibrahim Omer's user avatar
0 votes
2 answers
156 views

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 ...
Kane's user avatar
  • 11
-1 votes
2 answers
161 views

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 ...
Ibrahim Omer's user avatar
0 votes
1 answer
145 views

Vector homework problem [closed]

This is a question from Engineering Mechanics by Shames. I am unable to resolve this as the question mentioned.
Heisen Berg's user avatar
0 votes
1 answer
105 views

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 ...
square potato's user avatar
1 vote
4 answers
844 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 ...
Sreenandan Balasubramaniam's user avatar
0 votes
2 answers
608 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 ...
nwsteg's user avatar
  • 169
0 votes
0 answers
488 views

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 ...
Iuri's user avatar
  • 15
0 votes
2 answers
238 views

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 ...
Kane's user avatar
  • 11
1 vote
2 answers
921 views

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 ...
Adam's user avatar
  • 11
4 votes
2 answers
445 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 ...
CBRF23's user avatar
  • 363
3 votes
4 answers
143 views

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 ...
MB101874's user avatar
5 votes
6 answers
2k 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 ...
Abdulsalam_Musaad's user avatar
3 votes
2 answers
139 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, ...
Marius Wanscher's user avatar
1 vote
1 answer
746 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 ...
Milo's user avatar
  • 11
1 vote
0 answers
34 views

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 ...
utk2366's user avatar
  • 61
0 votes
2 answers
894 views

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 ...
Ben's user avatar
  • 123
3 votes
3 answers
99 views

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.
jore1's user avatar
  • 33
1 vote
3 answers
140 views

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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