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on the original wheel , did you only rivet once? When we try the rivets are not reliable. We know why, but have a difficult time mastering riveting!!
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we took our andymark 6 in wheels on concrete for a day of presentations and by the end of the day brand new wheels were completely flat like yours
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yes, we use plenty of rivets. never had any problems.
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It was a parade that flattened these.
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We have a pneumatic rivet gun and i tried using it today but I need to practice. |
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we use a pneumatic rivet gun now, but have also had success with a good hand riveter. we drill through the tread and the wheel in one of the "dips" in the tread. when we rivet it by hand, I push down on the head of the gun real hard and a student runs the handle. If they get in good and tight aluminum rivets will work fine.
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Once you get a pneumatic rivet puller, you'll wonder how you ever lived without it. It's hands down our best tool under $100.
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A good hand riveter (all-metal construction with suitably long handles) works fine, in my experience. |
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If you're doing sheet metal, I can see how it would be a real pain to have to do all your rivets manually. |
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It's certainly meaningful quantity, and it's certainly worth it. The time saved is huge. I like to think of labor in terms of minimum wage. If the cost of a tool saves enough labor that it's "making" more than minimum wage, it's worth it (as our kids make well above minimum wage when they're out fundraising). The flipside is true too... any fabrication we do that "saves" less than minimum wage is a bad decision, and should be a COTS item. Too many teams work themselves for below minimum wage. |
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If we save some amount of time on our preseason drive chassis (say, an hour or two) by having a pneumatic riveter, there is really no feasible way we can readily turn that hour or two into money given the constraints of our team structure. There are a lot of assumptions implicit in the utility calculation you've outlined. Those assumptions are valid in some contexts, but certainly not universally. |
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We bought the Harbor Freight riveter right before our 2014 season to save us time and energy... and broke it almost immediately. We ended up just getting another hand riveter and using two of those. Ate up a LOT of time in build season though - with the amount of rivets in the claw we probably consumed more than 1 build meeting total in extra time wasted.
That said, hand riveters get the job done just fine. With practice we could do things like change claw parts (drilling out at least 12-16 rivets and replacing them) in just a few minutes. |
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I was trying it yesterday and it wasn't working well at all, however out hose was leaking a lot so i think that was the direct cause. Once we fix/ replace the hose we can see how it works!
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Stephen, were you using the small yellow compressor directly or hooking it up to the wall-mounted air line? Send an email to Drake/Laverty to get a replacement host once you find the leak.
I'm not sure it's worth it to bring a compressor tank & air rivet gun to competition just for tread rivets, so we'll have to see what else we can rivet this season if the air rivet gun works so well we decide to go that route. |
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EDIT: *Ducks* |
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After some testing we found a large hand riveter (the style typically used for large rivets) worked better for putting nitrile on aluminium wheels than a air riveter. It allowed us to put a lot more pressure on the rivet when setting it compressing the tread around the rivet to create a secure attachment.
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And some events will not allow them because teams MIGHT use them to fill up their air tanks??? |
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Wow, someone sure has been using those wheels. We had a demo on pavement, but we limited skid turns, so by the end, they were only a bit worn down. Then we replaced them for an off season event.
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My those treads are worn. Good thing you know how to replace them, quickly.
---- Re: thread hijack to pit compressors -- at many events where I have volunteered, the people responsible for pit power want to know which teams have compressors. For example, at St. Joseph last year, we kept an inspector assigned to watch teams unloading and check for pit compressors. This was NOT motivated by suspicion that such teams might use pit compressors to fill pneumatic storage tanks before a match. It was motivated by a strong desire to keep pit power in service all the time, even if that meant juggling pit assignments so that the number of compressors on any one distribution circuit did not get too high. Fortunately, we did not need to move any teams or ask them to refrain from using pit compressors. I have been at events in past years where one or both of those things did occur. Most of the pit compressors I have seen teams use at FRC events were rated for 15A current draw. That in itself is not much of a problem; however, many of these things draw much larger surge current when they start (I have measured up to 50A for a split-second) and THAT can push an already loaded distribution breaker past its trip point, knocking out power to a row of pits. Then the roadies have to scurry ...:o |
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