Take The Nuts, Bolts, Rivets, And Glue Out Of Bonding ... in

Published Dec 16, 20
5 min read

Rapid Rivet & Fastener Corp in Edwardsville, IL

This post is stimulated by a conversation with a student yesterday. He suggested that we utilize rivets rather of # 10-32 fasteners to connect a critical piece of structure. My very first response was unfavorable, but I found myself not able to articulate a truly excellent description why we should use fasteners over rivets.

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LA Fasteners Inc.

15 W, 650 S Frontage Rd, Burr Ridge, IL 60527
+17084474500
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Would anyone want to share their engineering based opinions about the advantages and disadvantages of utilizing rivets vs threaded fasteners in FIRST robotics? Are there specific applications where your group prefers one type over another? Do you have particular style rules, tools, specific rivet part numbers, etc. which you use effectively? Would you, for example, usage rivets to attach a plate sprocket 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 competition season, many, if not all of them have actually been drilled out and replaced with threaded fasteners.

Here are my observations based upon past experience. Please correct my misconceptions if your experience says I'm wrong: If parts require to be eliminated for servicing the robot, you must utilize threaded fasteners. Rivets must be utilized for installations which are anticipated to be permanent. Rivets are best in shear applications.



Rivets of comparable strength to threaded fasteners (stress and shear) don't provide substantial weight cost 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 leads to the removal of a nut) Rivets are most helpful and have the most possible for weight cost savings when signing up with extremely thin products (ex 1/16" thick aluminum) which can't be tapped.

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Anyone care to share their experiences? I'm expecting more in-depth reactions than "We utilize rivets. They work fantastic 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. Idea being an overall weight savings over several mainly 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 misconceptions if your experience states I'm incorrect: If parts require to be gotten rid of for servicing the robot, you need to use threaded fasteners. Rivets need to be used for installations which are expected 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. File Fasteners. ToddF: Rivets are best in shear applications. If utilized in tension applications, they tend to chill out over time, and aren't quickly re-tightened except by drilling out and replacing the rivet.

Screws in tension have tension risers at the threads which can cause the thread to fail. 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 wrong). Rivets just loosen in stress if there is a shock load on them.

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If you expect heavy shock loads, utilize threaded fasteners (with Loctite) (Round Head Fasteners). ToddF: Rivets of similar strength to threaded fasteners (stress and shear) do not provide considerable weight savings. Corollary: Changing a threaded fastener with a lighter rivet leads to decreased strength because joint. (The exception may be if usage of a rivet leads to the elimination of a nut) The majority of threaded fasteners are solidified steel.

For the exact 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 cost savings when signing up with really thin materials (ex 1/16" thick aluminum) which can't be tapped. Rivets tend to be beneficial on thin product for that factor as long as the reach of the rivet is proper, nevertheless, rivets also save weight when the strength of steel screws are not required and nuts can be eliminated.

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The exact same holds true for screws. Soft product needs to always have washers to spread the load of the fastener (no matter type). Hope that assists. So as a basic basis on my team, rivet if it is non-essential, and bolt it if it is essential. If the part your protecting will see a great deal of wear and tear throughout the season, bolt it.

There are some applications where we require to use bolts, just since 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 need zero, or near to zero, lossesning throughout the season, due to the fact that if the hole is not best for the rivet, the rivet will lossen, where ever the force.

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