What is the best way to size an extension spring with specific requirements?

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Discussion Overview

The discussion revolves around the sizing of an extension spring with specific requirements, including material, dimensions, and force characteristics. Participants explore options for finding or calculating suitable springs based on the provided specifications.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant outlines specific requirements for an extension spring, including material (stainless steel), diameter (0.75 inch), rest length (5.5 inches), and force specifications at different extensions.
  • Another participant suggests a website that offers a wide range of extension springs, indicating previous success with their products.
  • A different participant recommends an online spring calculator from Century Spring to assist in sizing the spring.
  • A later reply indicates that the original poster found an off-the-shelf spring that nearly meets their requirements.
  • One participant reiterates the suggestion of the Stanley Spring website, expressing uncertainty about whether they have the specific type needed but remains optimistic.

Areas of Agreement / Disagreement

Participants do not appear to disagree on the need for a suitable spring; however, there are multiple suggestions for resources and approaches to finding or calculating the appropriate spring, indicating a lack of consensus on the best method.

Contextual Notes

Participants do not clarify the assumptions behind the force requirements or the specific calculations needed for sizing the spring, leaving some aspects unresolved.

Who May Find This Useful

Individuals seeking to size extension springs for specific applications, particularly those interested in material properties and force characteristics.

Avis
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I'm in need of an extension spring with some specific requirments:

Material: Stainless Steel
Diameter 0.75inch
Rest Length: 5 1/2inch inside the hooks
At 7 inches a forcle of 10lbs
At 10 inches (full extension) a force of no more than 20lbs (As low as possible)

Any idea on how to size this spring? What diamter wire will it need to be etc.
 
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Hey Avis...I think you would be able to find what you're looking for at this website. They have a huge range of extension springs, and I've had success before. All the best!

http://stanleyspring.com/
 
Hey, thanks guys! I found an off the shelf spring that is almost perfect! Can't complain with that!
 
You might find luck at this site...

http://stanleyspring.com/

I know they have a lot of different springs. I'm not too sure if they have the type you're looking for, but I'm betting they do. Good luck, Avis!
 

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