Storing energy in a torsion spring

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SUMMARY

Torsion springs, such as those used in clock movements, can retain stored energy for extended periods, often years, provided they are not released. A real-world example includes an 8-day clock from 1879 that maintained its torsion without significant loss over decades when not in use. The longevity of energy storage is contingent on the spring's condition and the absence of over-winding, which can lead to a dead break. Proper maintenance and repair, such as welding, can restore functionality to these springs.

PREREQUISITES
  • Understanding of torsion spring mechanics
  • Basic knowledge of clock mechanisms
  • Familiarity with material properties affecting energy storage
  • Experience in mechanical repair techniques
NEXT STEPS
  • Research the properties of different materials used in torsion springs
  • Learn about the mechanics of clock movements and their components
  • Study techniques for repairing and maintaining vintage clock mechanisms
  • Explore the effects of over-winding on torsion springs and how to prevent it
USEFUL FOR

Clockmakers, mechanical engineers, hobbyists interested in vintage clock restoration, and anyone involved in the maintenance of mechanical devices utilizing torsion springs.

alex1978
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Hello!

This might be a seriously obvious question but...

if I were to wind up a torsion spring, such as the type found in a clock movement, and then not release it, how long could that energy stay stored? Presumably it depends on the material used but could it hold it's energy for years?!

Many thanks,
Alex
 
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Yes; they will stay wound for a very long time ... as long as the clock isn't ticking.

I have an 8 day clock with a torsion spring - bought by my great grandfather in 1879. It worked well when I repaired it in 1965. I could stop/start the movement by moving a pawl on/off one of the gears; this was handy in making adjustments. When I would get back to work on it hours/days/weeks later the spring would not have lost any torsion.

However, it dead break when over-wound. It sat for many years until I gave it to my son the mechanical engineer; he repaired the spring (welded it? I forget) and it is still ticking away whenever he winds it up.
 
Brilliant - thank you. I thought that was probably the case. Good to hear a real world example!
 

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