Spring characteristics when loaded with a mass

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SUMMARY

This discussion centers on the behavior of a coiled tension spring when loaded with a mass, specifically addressing its extension and potential stability issues. According to Hooke's Law, the extension of the spring should remain consistent regardless of its orientation; however, coiling the spring introduces frictional concerns that could affect performance. The proposed design resembles a retractable tape measure, where the spring is coiled around an axle and extends or retracts based on the load applied. Participants highlight the importance of material selection and lubrication to mitigate friction and ensure smooth operation.

PREREQUISITES
  • Understanding of Hooke's Law and spring mechanics
  • Familiarity with tension springs and their applications
  • Knowledge of friction and its effects on mechanical systems
  • Basic principles of mechanical design, particularly in retractable mechanisms
NEXT STEPS
  • Research the properties and applications of tension springs
  • Explore methods to reduce friction in coiled spring systems
  • Study the design principles of retractable mechanisms, such as tape measures
  • Investigate lubrication techniques for clockwork springs to enhance performance
USEFUL FOR

Mechanical engineers, product designers, and hobbyists interested in spring mechanics and retractable systems will benefit from this discussion.

Jeviah
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Homework Statement


If a spring is loaded with a mass, the spring being completely vertical and the mass hanging below it there would be an extension in the spring relative to the mass applied/force applied according to hookes law. If the same spring was not vertical but coiled (similar to a garter spring but not connected to itself) I assume that the extension would still be the same as if it was vertical. My question is would having a tension spring coiled in this manner have any adverse effects such as instability in the spring, reducing the springs life span etc?

My reasoning behind this question is that coiling a spring in this manner will allow for the spring to extend as much as required while housing it in a much smaller area. I have read about constant force springs however as they do not obey hookes law and I have not/will not cover them in my studies I would prefer to avoid using them.

Homework Equations


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The Attempt at a Solution


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Jeviah said:
I assume that the extension would still be the same as if it was vertical
On this garter spring, where would you hang the mass you mention / apply the extending force ?
And: if not connected to itself, then: connected to what ?
 
Jeviah said:
was not vertical but coiled
Coiled around what, and how many times?
A rope coiled around a post experiences friction that grows exponentially with the arc length. I think you would quickly run into that problem with your coiled up spring.
 
Sorry that was a poor description on my part. So my plan is to coil a spring around an axle/wheel essentially, one end attached to the axle/wheel the other end attached to a load that can be removed. The load pulls on the spring and the spring extends, when the load is removed the spring would retract to its original position. The spring will have some flexible casing around it so it doesn't get tangled, also the materials used would be smooth with the hopes of reducing the friction. Friction between surfaces is undesirable but not a deal breaker as it would only slow down the extension/retraction of the spring. The best way I can describe it is that the design would be similar to a retractable tape measure, replacing the tape with a spring.

How many times it would be coiled around the axle I am unsure of at this point as I would need to research springs first and what maximum extension I need.
 
Jeviah said:
it would only slow down the extension/retraction of the spring.
No, it could stop it entirely.
Jeviah said:
similar to a retractable tape measure
The analogy doesn't quite work. The tape itself does not stretch. But at the centre of the holder there could be a coiled band, like a clockwork spring.
Clockwork springs can stick and need some lubrication, but they do have the advantage of being a flat strip of metal. I can't see the problem as being as easily solved with your flexible casing.
 

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