Aircraft Hardware - What You Need To Know Part 2 - Eaa in

Published Jan 14, 21
5 min read

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

This post is stimulated by a conversation with a trainee yesterday. He suggested that we utilize rivets rather of # 10-32 fasteners to attach a critical piece of structure. My first response was negative, but I found myself unable to articulate a really excellent description why we need to utilize fasteners over rivets.

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Would anybody want to share their engineering based viewpoints about the pros and cons of using rivets vs threaded fasteners in FIRST robotics? Are there specific applications where your team chooses one type over another? Do you have certain design rules, tools, particular rivet part numbers, and so on which you utilize effectively? Would you, for example, usage rivets to connect a plate sprocket to a versahub? Why or why not? We have actually used rivets sporadically in the past, but it constantly seems that by the end of competition season, many, 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 incorrect: If parts need to be gotten rid of for servicing the robot, you should use threaded fasteners. Rivets should be utilized for setups which are expected to be irreversible. Rivets are best in shear applications.



Rivets of similar strength to threaded fasteners (tension and shear) do not offer substantial weight cost 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 results in the elimination of a nut) Rivets are most helpful and have the most prospective for weight savings when signing up with really thin products (ex 1/16" thick aluminum) which can't be tapped.

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

Anyone care to share their experiences? I'm hoping for more detailed actions than "We utilize rivets. They work fantastic for us." How do you utilize them? What do you do to make them work for you? I like to use them in structural applications. Idea being an overall weight savings over a number of mostly long-term joints.

I concur 100% with threaded fasteners for moving parts and modular mechanism user interfaces ToddF: Here are my observations based upon past experience. Please fix my incorrect beliefs if your experience says I'm wrong: If parts need to be removed for servicing the robot, you need to utilize threaded fasteners. Rivets must be used for installations which are expected to be irreversible.

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

Screws in tension have tension risers at the threads which can trigger the thread to stop working. Threaded fasteners tend to loosen due to vibration. Rivets tend to loosen since they are improperly sized (reach is incorrect or hole size is wrong). Rivets just loosen up 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) (Wood Fasteners). ToddF: Rivets of similar strength to threaded fasteners (stress and shear) do not provide substantial weight savings. Corollary: Replacing a threaded fastener with a lighter rivet results in lowered strength in that joint. (The exception may be if use of a rivet leads to the removal of a nut) A lot of threaded fasteners are hardened steel.

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

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The same is true for screws. Soft material should constantly have washers to spread out the load of the fastener (regardless of type). Hope that helps. So as a basic basis on my group, rivet if it is non-essential, and bolt it if it is important. 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 use bolts, simply because we can't fit a rivet weapon head where we desire it. And if you do utilize bolts, keep in mind to either usage locknuts, or locktite on routine threaded nuts. We likewise bolt parts that require no, or near to no, lossesning throughout the season, due to the fact that if the hole is not ideal for the rivet, the rivet will lossen, where ever the force.

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