Questions tagged [springs]
The springs tag has no usage guidance.
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What is the failure mode of fiberglass rods in bending?
I have access to a bunch of used FRP rods, 1" in diameter x 40 feet long with metal ends.
I do not know yet if the plastic part is conventional polyester resin or nylon.
In normal use these rods ...
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How to prevent rotation on axis with torsion springs?
I am trying to model a cupholder sizer for a Honda Odyssey, similar to what the Toyota Camry has (example).
I've got a basic design in Fusion360 using torsion springs. What I'm finding though is that ...
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What are effective anti-corrosion coatings for high carbon steel springs?
In trampoline design, the most common springs have a total elongation of about 60% of rest lengh. E.g. a 10" spring can be stretched to 16" indefinitely without deformation. These springs ...
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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.
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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 ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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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}}\...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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? ...
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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 ...
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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 ...
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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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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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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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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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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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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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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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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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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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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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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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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 ...
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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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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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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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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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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 ...
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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 ...
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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,
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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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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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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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