The Different Types Of Fasteners And Their Uses - Fwb Products in

Published Jan 06, 21
5 min read

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This post is spurred by a discussion with a trainee the other day. He recommended that we utilize rivets rather of # 10-32 fasteners to connect an important piece of structure. My first response was negative, but I found myself not able to articulate a really excellent description why we should use fasteners over rivets.

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Would anyone be prepared to share their engineering based viewpoints about the advantages and disadvantages of using rivets vs threaded fasteners in FIRST robotics? Exist particular applications where your group chooses one type over another? Do you have particular design rules, tools, specific rivet part numbers, etc. which you utilize effectively? Would you, for instance, use rivets to connect a plate gear to a versahub? Why or why not? We have actually utilized rivets sporadically in the past, but it constantly appears that by the end of competitors season, numerous, if not all of them have actually been drilled out and changed with threaded fasteners.

Here are my observations based upon past experience. Please remedy my misconceptions if your experience states I'm wrong: If parts require to be eliminated for servicing the robot, you need to use threaded fasteners. Rivets need to be used for setups which are expected to be irreversible. Rivets are best in shear applications.



Rivets of similar strength to threaded fasteners (stress and shear) don't use significant weight savings. Corollary: Replacing a threaded fastener with a lighter rivet results in minimized strength in that joint. (The exception might be if usage of a rivet leads to the removal of a nut) Rivets are most useful and have the most possible for weight cost savings when joining extremely thin products (ex 1/16" thick aluminum) which can't be tapped.

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Anybody care to share their experiences? I'm hoping for more detailed reactions than "We use rivets. They work excellent for us." How do you utilize them? What do you do to make them work for you? I like to utilize them in structural applications. Concept being an overall weight savings over numerous mostly permanent joints.

I concur 100% with threaded fasteners for moving parts and modular system interfaces ToddF: Here are my observations based upon previous experience. Please fix my mistaken beliefs if your experience states I'm incorrect: If parts require to be gotten rid of for servicing the robot, you ought to utilize threaded fasteners. Rivets should be utilized for installations which are anticipated to be permanent.

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If you know you require to remove a part to service it (or another part) then use threaded fasteners. 14 Turn Fasteners. ToddF: Rivets are best in shear applications. If utilized in stress applications, they tend to chill out in time, and aren't easily re-tightened except by drilling out and replacing the rivet.

Screws in stress have tension risers at the threads which can trigger the thread to fail. Threaded fasteners tend to loosen up due to vibration. Rivets tend to loosen up because they are incorrectly sized (reach is wrong or hole size is wrong). Rivets only loosen in stress if there is a shock load on them.

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If you expect heavy shock loads, use threaded fasteners (with Loctite) (Threaded Fasteners). ToddF: Rivets of comparable strength to threaded fasteners (stress and shear) do not provide considerable weight savings. Corollary: Changing a threaded fastener with a lighter rivet leads to minimized strength in that joint. (The exception might be if usage of a rivet leads to the elimination of a nut) A lot of threaded fasteners are solidified steel.

For the very same strength the rivet will typically weigh 2/3 the weight of screws. ToddF: Rivets are most helpful and have the most potential for weight savings when joining extremely thin products (ex 1/16" thick aluminum) which can't be tapped. Rivets tend to be useful on thin product for that factor as long as the reach of the rivet is proper, nevertheless, rivets also conserve weight when the strength of steel screws are not needed and nuts can be removed.

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The exact same holds true for screws. Soft material ought to constantly have washers to spread out the load of the fastener (regardless of type). Hope that helps. So as a general basis on my team, rivet if it is non-essential, and bolt it if it is necessary. If the part your securing will see a lot of wear and tear throughout the season, bolt it.

There are some applications where we need to use bolts, merely due to the fact that we can't fit a rivet weapon head where we want it. And if you do utilize bolts, remember to either use locknuts, or locktite on routine threaded nuts. We likewise bolt parts that need zero, or near to zero, lossesning throughout the season, because if the hole is not best for the rivet, the rivet will lossen, where ever the force.

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