# Tag Info

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

For a given free length and spring rate there are an infinite number of designs of coil spring. However, there are many practical limitations that limit the options. A spring with a few coils, of thin ...
• 728

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

The ratio of the spring diameter to the wire diameter is the primary factor.
• 4,755
Accepted

### How is energy in the hairspring restored in a mechanical watch?

I enjoyed the detailed and beautifully animated diagrams you linked. The source of energy to the balance wheel is the end of the fork that is pressured by the jewels acting intermittently by the ...
• 22.4k
Accepted

### Are recoil operated crossbows/ballistae feasible?

To make my comment into an actual answer, this design is not feasible because the energy balance doesn't add up. All the energy that you have available is stored in the limbs being pulled back. Now ...
• 1,913
Accepted

### Help with linear rod drill press like design/materials

it may be necessary to construct more than one design (known as iteration) in order to refine your final objective. "Very rigid and with no slop" is a rather general description. "A tolerance of 0.10 ...
• 7,097

### Overextending and cutting a coil spring

Stiffness: If you cut the spring by 1/2, it will have double stiffness (spring rate). This means your 2/3 springs rate will be 3/2 of the original rate. This is independent of the length of the ...
• 171
1 vote

### What does squared end spring mean?

Squared means machined to match a flat surface perpendicular to the axis of the spring. The other cheaper option, often found on car suspension, is to just make the mating surface have a surface ...
• 15.7k
1 vote

### What happens while skewing a spring?

if the connection at the end of the spring is a pin connection and the deformation is small, not a big change in behavior will happen. we still have $$F=Kx$$ But if the connection is fixed and is not ...
• 22.4k
1 vote

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

Let's compare two springs of the same alloy but with different numbers of turns $N_1 =2 N_2$ . over the length of the coil, $L$ Now if we extend the coils to a length $$L=2L_{inital}$$ The coils with ...
• 22.4k
1 vote

### What causes damage to my drone when falling down?

A change in momentum is called an impulse which is equal to force applied over time. It's not the change in momentum since the change in momentum to reach zero speed from a given speed is the same ...
• 5,606
1 vote

### How to build an Adjustable Tension Spring?

I don't think either of the ways you are proposing with change the stiffness of the spring. What they will change is the starting value at compression (so you will immediately start from another point ...
• 24.3k
1 vote

### Looking for a compression spring alternative with 10x lifespan

Compressed air like an air suspension in a car or truck. 100K is not many cycles for a steel spring; springs such as engine valves run many ,many millions of cycles ,normally without failure.
• 6,134
1 vote

### What's the name of a device to simulate an object jumping in the air?

Try trigger release or catch release or latch mechanism. But why not use a compressed air jet - the control can be with you, just needs a tube and support.
• 15.7k

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