Ot: Strength Differences Between Bolt And Rivet - Practical ... in Elmwood Park, IL

Published Feb 01, 21
5 min read

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This post is stimulated by a conversation with a trainee the other day. He suggested that we use rivets instead of # 10-32 fasteners to attach a vital piece of structure. My first response was unfavorable, but I found myself not able to articulate a truly good explanation why we ought to use fasteners over rivets.

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Would anyone want to share their engineering based viewpoints about the pros and cons of using rivets vs threaded fasteners in FIRST robots? Exist specific applications where your group prefers one type over another? Do you have specific design rules, tools, specific rivet part numbers, etc. which you use successfully? Would you, for example, use rivets to connect a plate sprocket to a versahub? Why or why not? We have actually used rivets sporadically in the past, but it always seems that by the end of competition season, numerous, if not all of them have actually been drilled out and changed with threaded fasteners.

Here are my observations based on past experience. Please fix my incorrect beliefs if your experience says I'm incorrect: If parts require to be eliminated for servicing the robot, you must use threaded fasteners. Rivets must be utilized for installations which are expected to be irreversible. Rivets are best in shear applications.

Rivets of comparable strength to threaded fasteners (stress and shear) do not offer significant weight savings. Corollary: Changing a threaded fastener with a lighter rivet results in decreased strength because joint. (The exception might be if usage of a rivet results in the elimination of a nut) Rivets are most useful and have the most possible for weight savings when signing up with really thin products (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 detailed responses than "We use rivets. They work terrific for us." How do you use 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 irreversible joints.

I concur 100% with threaded fasteners for moving parts and modular system user interfaces ToddF: Here are my observations based on previous experience. Please remedy my misconceptions if your experience says I'm wrong: If parts require to be gotten rid of for servicing the robot, you ought to use threaded fasteners. Rivets ought to be used for setups which are expected to be permanent.

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If you understand you require to remove a part to service it (or another part) then utilize threaded fasteners. Metal Fasteners. ToddF: Rivets are best in shear applications. If utilized in stress applications, they tend to relax with time, and aren't quickly re-tightened other than 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 due to vibration. Rivets tend to loosen up since they are incorrectly sized (reach is incorrect or hole size is wrong). Rivets just loosen in tension if there is a shock load on them.

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If you anticipate heavy shock loads, use threaded fasteners (with Loctite) (Corrugated Fasteners). ToddF: Rivets of similar strength to threaded fasteners (tension and shear) do not offer substantial weight cost savings. Corollary: Changing a threaded fastener with a lighter rivet leads to minimized strength in that joint. (The exception might be if use of a rivet leads to the elimination of a nut) A lot of threaded fasteners are hardened steel.

For the same strength the rivet will typically weigh 2/3 the weight of screws. ToddF: Rivets are most beneficial and have the most prospective for weight cost savings when joining very thin materials (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 conserve weight when the strength of steel screws are not required and nuts can be removed.

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The very same holds true for screws. Soft material ought to constantly have washers to spread the load of the fastener (regardless of type). Hope that assists. 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 require to utilize bolts, just due to the fact that we can't fit a rivet gun head where we desire it. And if you do utilize bolts, remember to either use locknuts, or locktite on regular threaded nuts. We also bolt parts that require no, or close to absolutely no, lossesning throughout the season, since if the hole is not perfect for the rivet, the rivet will lossen, where ever the force.