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Re: Lift Peg (Spring) Source?
When I checked on Saturday, it was a 1 week wait and we placed an order. I'll let you know if that happens. We'll use a dowel till then.
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Re: Lift Peg (Spring) Source?
Century Spring product number C-333 is very similar in diameter (O.D. And wire) and just happens to be 9" long. You'd still have to cut the ends off, but there should be a tonne of these around.
https://www.amazon.ca/Century-Spring.../dp/B000BD6BUE And I warned the woman I spoke to at Essentra Components to expect a surge of orders. FIRST can have that effect... Jason |
Re: Lift Peg (Spring) Source?
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Re: Lift Peg (Spring) Source?
Century Spring 5518 looks like it may be usable. Anyone agree or disagree?
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Re: Lift Peg (Spring) Source?
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I think you want Century Spring E-41, the rate constant matches on that one. Disclaimer, I am an EE, and I know nothing about springs. Quote:
Current lead time from Essentra is 8 Days |
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Re: Lift Peg (Spring) Source?
Already gone. :-)
For now, I've ordered the McMaster-Carr 9664k66, which is smaller in diameter (.750) but has somewhat similar spring characteristics. It was in stock, to be shipped today. Of course, now that I've said this in a public forum... |
Re: Lift Peg (Spring) Source?
For what it's worth, I was able to find a similar spring at our local ACE Hardware, it was shorter than the regulation spring which is of course not ideal, but it should suffice for a few rounds of prototyping.
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Re: Lift Peg (Spring) Source?
Ordered ours from here. Few days. http://www.midlandhardware.com/639807.html
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Re: Lift Peg (Spring) Source?
Teams in larger cities, or more industrial areas, should also be able to find a local spring manufacturer that may be able to help you out by building a custom spring.
It might cost a bit more, but you never know... when a couple enthusiastic young people ask for help, sometimes they get more than just a spring. Jason |
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First, you are right, spring rate and rate constant are different. However I suspect that what is shown on the E-41 Spring is in fact the rate constant. After comparing quite a few manufacturers, all of them list a value of ~159 for rate, rate constant, or spring rate for these 36inch pieces of what seems to be spring stock. However at shorter lengths they list a Spring rate instead. I believe the E-41 is the equivalent of the McMaster Part, and the 5518 is a 12 inch spring made out of similar stock. If the term Rate on the E-41 page is not an error then I am not sure I can explain the physics of that spring as all of the physical characteristic match other parts, but the Rate Constant would be off by a factor of 36. Long story short, you are definitely right, but I think both parts actually work. But someone may want to confirm with Century Spring if they are going to order from there. |
Re: Lift Peg (Spring) Source?
https://www.mcmaster.com/#9664K66 is reasonably close to the same spring force and only 1/8" smaller diameter.
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Re: Lift Peg (Spring) Source?
Does anyone know if we can use a magnet to help put the gear on the peg?
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