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Lift Peg (Spring) Source?
The McMaster listing https://www.mcmaster.com/#9664k68/=15ta0ri as per the field drawing is showing "usually ships in 2 weeks" and our order confirmation says "ships in 2-4 weeks :eek:
Anyone have leads on other (more readily available) sources? |
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Hi folks-- ran into the same issue. I ordered the 9664K68 and will wait the 2 weeks for the real deal... However right above that spring on McMaster is: 9664K31 it is a lighter gauge wire .105 vs the .135 but it has the same outside diameter... I think it will get us through prototyping in week one. (it was available right away)
Hope that helps a little. |
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Try this. They also have Canadian distribution so will ship without brokerage. http://www.essentracomponents.com/en...springs/es-241
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Just call McMaster. "ships in 2 weeks" tends to be the standard placeholder for "we don't have this at the moment". I've almost always had that 2 weeks go down to 1-2 days when I call and say I need it sooner.
I'm sure it's gonna be longer than 2 days in this case but I would be surprised if McMaster is actually out of stock for 2 weeks. It may just be an automated status since they got a massive run on an item they probably sell 1 or 2 of a day at most. |
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Don't forget McMaster has five regional distribution centers. You might be able to pick one up if you're located near one of the warehouses.
Unfortunately I wasn't able to determine the location of all of the regional warehouses, but I do know we have one here in Kansas City. Can't hurt to call and ask for directions to a warehouse, or rushed fulfillment. |
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Also have any Israeli teams found an Israeli distributor with an equivalent spring? |
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Greetings,
I am looking at the "team build" wood drawings. I do not see a cut length for the 7/8 diameter spring. McMaster shows the part is 36" long. I doubt we need all that. Home Depot sells a 7/8 with some ends that i would have to cut off. Anyone see the spring length for the team build? Thanks, Troy 2450 |
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The length is 9" per the team build plans. We bought a spring at Menards that is that length, but not as thick guage, therefore not as stiff. It works fine for prototyping. Vince |
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I found a 12 inch extension spring at Home Depot, sku 172 045 15637. Cost about $7. This is the Everbuilt (Home Depot branded) spring found near door hardware.
Looks like it will work just fine, It may be a little less stiff than the McMaster. Available today! (I do not work or endorse Home Depot Products.:yikes: ) https://drive.google.com/open?id=0B2...mNwMGxsZ3ZOVU0 |
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I called. They guy said, "Is this for a robot project? Yeah, we're not going to be able to get them for at least a week." [Los Angeles area center in Santa Fe Springs]
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I just spoke with McMaster [Atlanta Distribution Center] and they guy on the phone said that this spring is currently the most popular item on their site right now (haha go FIRST). He also said that the majority of the phone calls he has answered today have been asking for this spring. He was genuinely confused on why this spring was so popular.
He said that, if anything, it will probably be longer than expected. So we might be out of luck. |
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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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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 |
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Century Spring 5518 looks like it may be usable. Anyone agree or disagree?
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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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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... |
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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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Ordered ours from here. Few days. http://www.midlandhardware.com/639807.html
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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. |
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https://www.mcmaster.com/#9664K66 is reasonably close to the same spring force and only 1/8" smaller diameter.
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Does anyone know if we can use a magnet to help put the gear on the peg?
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Is there someone who has one of these springs from McMaster-Carr who can measure and share how much the spring bends down when a gear is hung at the end with the barb? If we had that value, it might be easier to find an equivalent or simulate the behavior until we can get the real thing.
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To the point... the lovely man behind the desk let us know that other teams had come in looking for the spring, and not only did they not have it in our distribution center, but that it is currently out of stock in all fifty warehouses that he can see the stock lists for. So it sounds like this thread of duplicates/acceptable substitutes will be super valuable! As we get ours in (we got the Amazon one) we'll take photos/video of interactions as best we can. |
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This is 612 - Chantilly, VA.
Identified this as a near alternative: http://www.centuryspring.com/extension-spring-5518.html Must order at least 5. Cost for 5 with shipping would be $79.80. Any interest in a group order? |
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From what I tried, only the 5 spoke holes fit over the hook on the end of the spring. When I put one of those openings over the spring and left the gear at the very end - the spring really did not appear to bend. It may have ever so slightly bent but for all intents and purposes it was zero. How it behaves after 70 matches of robots slamming gears onto it may be a different story. |
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Teams in the East Bay / San Francisco area - I have the McMaster spring on order & can send pieces out when it arrives in ~2 weeks. Shoot me a PM.
Using a 6" long home depot substitute for now, modifying the field piece design to get an extra 3" on the elevator. We'll probably shatter the plywood in the next couple days and I'll have to come up with something new... |
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Re: Lift Peg (Spring) Source? I FOUND MFG!
Hi All
McMaster gets this spring from AJ Coil in Indiana 574-353-7174 They will take private orders minimum is $75 You will need the spring specs: 36" long, OD 0.875" wire diameter 0.135" to get the same spring 15 springs is just over the minimum cost so I recommend that you get local teams together for a single order. They said they were surprised that McMaster was ordering so many of these but were kind enough to slip my order in the mix. "some time you just need to ask the right questions" Good luck with your Airship Brian 3140 Flagship |
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Another option (also in Indiana) is Myers Spring Company: 574.753.5105
Similar process to what is described above. My friend who owns the company told me there is already a planned run of this spring coming up soon due to demand. |
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A 9" long extension spring is 9" from loop inside to loop inside. So the length after cutting odd the loops will be closer to 7". Also some one should see if there are springs to the OD and WD that are 2x longer that can be cut down. I hope FIRST is monitoring this thread and getting the idea that they might have spoken with MMC before kickoff, to warn them of the response. |
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Work from my friend at Myers is the springs are 9" long - they probably cut the 36" McM one into four 9" springs. I suspect a bolt is mounted from the back that is the same diameter as the interior diameter of the spring, and the spring is somehow mounted to the bolt on the front, but I could be wrong.
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We actually received our spec spring yesterday. I'm not sure if this was just because we were one of the first to order, pure luck, or a sign that McMaster might have pulled some magic strings and got additional inventory in.
We have not cut our spring to length yet, but did manage to get a piece of 3/4" SCH 40 PVC pipe jammed into one end in such a way that we're going to have to invent a clever way to remove it. I'm offering to do limited testing with the limited resources we do have, assuming we can restore the spring to it's original un-PVC'ed state. |
Re: Lift Peg (Spring) Source, Hardware store, Century # c-333
This is an extension spring 9" long with the exact same diameter and wire size. Century item # C-333.
Once you cut off the loops on the end its a little short but just the same stiffness as the one specified. C Affel, Mentor FRC 423. |
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Andymark has apparently ordered some but they won't be in stock until 1/24/17
http://andymark.com/spring |
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If you are in the Metro Detroit area (we are in Canton), we have a few extras if you want to PM me and then pick up a 36" spring which according to the very friendly people at Peterson Specialty Products is a really close approximation of the McMaster Carr item (they used a different metal, that does not take to bends as well, but should have the same spring rate? -- what do I know I am a programming mentor).
They gave them to us for free, so if you are interested I will pass the extras out at the same price, just PM me and we can arrange a pickup. |
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Sorry for this suggesting. This place said they had inventory, but then didn't reply to emails and phone calls. Finally got through and they said they were on backorder. Cancelled order.
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(Full disclosure of the painfully obvious: I work at AndyMark.) |
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Close counts in horseshoes, hand grenades, and hopefully lift springs. |
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I don't see this cross-posted yet. For Century in particular, but anyone looking to source their spring from another vendor should see this:
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