General Types Of Rivets & Their Applications - Goebel Fasteners in Centralia, IL

Published Feb 09, 21
5 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 critical piece of structure. My very first response was negative, however I discovered myself not able to articulate a truly good description why we ought to use fasteners over rivets.

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Would anyone be willing to share their engineering based viewpoints about the pros and cons of using rivets vs threaded fasteners in FIRST robots? Are there specific applications where your team prefers one type over another? Do you have particular style guidelines, tools, particular rivet part numbers, and so on which you utilize successfully? Would you, for example, use rivets to connect a plate sprocket to a versahub? Why or why not? We have actually utilized rivets sporadically in the past, however it constantly seems that by the end of competitors season, lots of, if not all of them have actually been drilled out and replaced with threaded fasteners.

Here are my observations based on past experience. Please fix my misconceptions if your experience states I'm wrong: If parts require to be gotten rid of for servicing the robot, you ought to utilize threaded fasteners. Rivets must be used for installations which are anticipated to be permanent. Rivets are best in shear applications.



Rivets of comparable strength to threaded fasteners (tension and shear) do not offer significant weight cost savings. Corollary: Replacing a threaded fastener with a lighter rivet results in lowered strength because joint. (The exception may be if usage of a rivet leads to the removal of a nut) Rivets are most useful and have the most potential for weight cost savings when joining very thin materials (ex 1/16" thick aluminum) which can't be tapped.

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Anybody care to share their experiences? I'm wishing for more comprehensive reactions 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 cost savings over numerous primarily permanent joints.

I concur 100% with threaded fasteners for moving parts and modular system user interfaces ToddF: Here are my observations based upon past experience. Please fix my mistaken beliefs if your experience says I'm wrong: If parts require to be removed for servicing the robot, you should utilize threaded fasteners. Rivets need to be utilized for setups which are expected to be permanent.

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If you know you need to eliminate a part to service it (or another part) then utilize threaded fasteners. Brass Fasteners. ToddF: Rivets are best in shear applications. If used in tension applications, they tend to relax gradually, and aren't easily re-tightened other than by drilling out and replacing the rivet.

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

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If you anticipate heavy shock loads, utilize threaded fasteners (with Loctite) (All Points Fasteners). ToddF: Rivets of similar strength to threaded fasteners (tension and shear) do not offer considerable weight savings. Corollary: Replacing a threaded fastener with a lighter rivet results in minimized strength in that joint. (The exception may be if use of a rivet results in the elimination of a nut) Most threaded fasteners are solidified steel.

For the very same strength the rivet will usually weigh 2/3 the weight of screws. ToddF: Rivets are most helpful and have the most possible for weight cost savings when joining really thin products (ex 1/16" thick aluminum) which can't be tapped. Rivets tend to be helpful on thin material because of that as long as the reach of the rivet is proper, however, rivets likewise conserve weight when the strength of steel screws are not required and nuts can be removed.

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The exact same is real for screws. Soft material must constantly have washers to spread the load of the fastener (no matter type). Hope that helps. So as a basic basis on my group, rivet if it is non-essential, and bolt it if it is necessary. If the part your securing will see a great deal of wear and tear throughout the season, bolt it.

There are some applications where we require to utilize bolts, merely due to the fact that we can't fit a rivet gun head where we desire it. And if you do use bolts, remember to either use locknuts, or locktite on regular threaded nuts. We also bolt parts that need no, or close to absolutely no, lossesning throughout the season, because if the hole is not perfect for the rivet, the rivet will lossen, where ever the force.

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