About Blind Rivets - Bolt Depot in

Published Dec 12, 20
5 min read

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This post is spurred by a conversation with a trainee the other day. He recommended that we utilize rivets rather of # 10-32 fasteners to attach a crucial piece of structure. My first reaction was negative, however I found myself not able to articulate a truly great description why we should use fasteners over rivets.

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Would anybody want to share their engineering based viewpoints about the advantages and disadvantages of utilizing rivets vs threaded fasteners in FIRST robots? Exist certain applications where your team prefers one type over another? Do you have certain style rules, tools, particular rivet part numbers, etc. which you utilize successfully? Would you, for example, use rivets to connect a plate sprocket to a versahub? Why or why not? We've used rivets sporadically in the past, but it always seems that by the end of competitors season, numerous, if not all of them have actually been drilled out and changed with threaded fasteners.

Here are my observations based on previous experience. Please fix my misconceptions if your experience says I'm incorrect: If parts need to be gotten rid of for servicing the robot, you ought to use threaded fasteners. Rivets should be used 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 substantial weight savings. Corollary: Changing a threaded fastener with a lighter rivet results in reduced strength because joint. (The exception may be if usage of a rivet results in the removal of a nut) Rivets are most helpful and have the most possible for weight savings when signing up with very thin materials (ex 1/16" thick aluminum) which can't be tapped.

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Anyone care to share their experiences? I'm hoping for more in-depth actions than "We utilize rivets. They work excellent 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 a total weight cost savings over several mostly long-term joints.

I agree 100% with threaded fasteners for moving parts and modular mechanism user interfaces ToddF: Here are my observations based upon previous experience. Please fix my misconceptions if your experience says I'm wrong: If parts require to be removed for servicing the robotic, you must utilize threaded fasteners. Rivets need to be utilized for installations which are anticipated to be permanent.

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

Screws in stress 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 up because they are incorrectly sized (reach is wrong or hole size is incorrect). Rivets only 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) (Table Top Fasteners). ToddF: Rivets of comparable strength to threaded fasteners (stress and shear) don't provide substantial weight savings. Corollary: Changing a threaded fastener with a lighter rivet results in decreased strength because joint. (The exception might be if use of a rivet results in the elimination of a nut) The majority of threaded fasteners are hardened steel.

For the exact same strength the rivet will usually 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 extremely 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 appropriate, nevertheless, rivets also conserve 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 should constantly have washers to spread out the load of the fastener (no matter type). Hope that assists. So as a general basis on my group, rivet if it is non-essential, and bolt it if it is essential. 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 need to use bolts, simply since we can't fit a rivet gun head where we desire it. And if you do utilize bolts, keep in mind to either use locknuts, or locktite on routine threaded nuts. We likewise bolt parts that need zero, or near no, lossesning throughout the season, since if the hole is not best for the rivet, the rivet will lossen, where ever the force.

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