Rivets - An Overview - Sciencedirect Topics in

Published Mar 08, 21
4 min read

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This post is spurred by a discussion with a student yesterday. He recommended that we utilize rivets rather of # 10-32 fasteners to connect a crucial piece of structure. My very first reaction was unfavorable, however I found myself not able to articulate a genuinely excellent description why we should use fasteners over rivets.

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Would anybody want to share their engineering based viewpoints about the benefits and drawbacks of using rivets vs threaded fasteners in FIRST robotics? Exist certain applications where your team chooses one type over another? Do you have certain style guidelines, tools, particular rivet part numbers, etc. which you utilize effectively? Would you, for example, use rivets to attach a plate gear to a versahub? Why or why not? We have actually utilized rivets sporadically in the past, however it always seems that by the end of competition season, many, if not all of them have been drilled out and replaced with threaded fasteners.

Here are my observations based on past experience. Please fix my mistaken beliefs if your experience says I'm incorrect: If parts need to be removed for servicing the robot, you ought to utilize threaded fasteners. Rivets need to be utilized for installations which are anticipated to be irreversible. Rivets are best in shear applications.



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

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Anyone care to share their experiences? I'm wishing for more comprehensive responses than "We use rivets. They work great 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 mainly long-term joints.

I agree 100% with threaded fasteners for moving parts and modular system interfaces ToddF: Here are my observations based on past experience. Please correct my mistaken beliefs if your experience says I'm incorrect: If parts require to be removed for servicing the robot, you must use threaded fasteners. Rivets should be used for installations which are expected to be irreversible.

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If you understand you need to remove a part to service it (or another part) then use threaded fasteners. Fasco Fasteners. ToddF: Rivets are best in shear applications. If utilized in stress applications, they tend to relax gradually, and aren't quickly re-tightened except by drilling out and replacing the rivet.

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

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If you expect heavy shock loads, use threaded fasteners (with Loctite) (Types Of Fasteners). ToddF: Rivets of similar strength to threaded fasteners (stress and shear) don't offer significant weight cost savings. Corollary: Changing a threaded fastener with a lighter rivet results in decreased strength in that joint. (The exception might be if usage of a rivet results in the removal of a nut) A lot of threaded fasteners are hardened steel.

For the very same strength the rivet will normally weigh 2/3 the weight of screws. ToddF: Rivets are most useful and have the most prospective for weight savings when joining very thin products (ex 1/16" thick aluminum) which can't be tapped. Rivets tend to be useful on thin material because of that as long as the reach of the rivet is appropriate, however, rivets likewise save weight when the strength of steel screws are not needed and nuts can be eliminated.

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The exact same holds true for screws. Soft product should constantly have washers to spread the load of the fastener (no matter type). Hope that helps. So as a general basis on my group, rivet if it is non-essential, and bolt it if it is vital. If the part your protecting will see a lot of wear and tear throughout the season, bolt it.

There are some applications where we need to utilize bolts, simply since we can't fit a rivet gun head where we desire it. And if you do use bolts, keep in mind to either use locknuts, or locktite on routine threaded nuts. We likewise bolt parts that require no, or close to zero, lossesning throughout the season, since if the hole is not ideal for the rivet, the rivet will lossen, where ever the force.

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