Rivet Tools & Rivets - Fastening Tools - The Home Depot in Farmer City, IL

Published May 07, 21
5 min read

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This post is stimulated by a conversation with a trainee the other day. He recommended that we utilize rivets instead of # 10-32 fasteners to attach a vital piece of structure. My very first reaction was negative, but I found myself unable to articulate a truly great description why we need to use fasteners over rivets.

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Would anybody want to share their engineering based opinions about the pros and cons of using rivets vs threaded fasteners in FIRST robots? Are there particular applications where your team chooses one type over another? Do you have particular design guidelines, tools, particular rivet part numbers, etc. which you utilize effectively? Would you, for example, use rivets to attach a plate sprocket to a versahub? Why or why not? We've used rivets sporadically in the past, but it always appears that by the end of competition season, many, if not all of them have been drilled out and changed with threaded fasteners.

Here are my observations based upon previous experience. Please correct my incorrect beliefs if your experience states I'm wrong: If parts require to be gotten rid of for servicing the robotic, you ought to utilize threaded fasteners. Rivets must 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) do not provide significant 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 elimination of a nut) Rivets are most helpful and have the most prospective for weight cost savings when joining 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 hoping for more in-depth reactions than "We use rivets. They work fantastic for us." How do you use them? What do you do to make them work for you? I like to use them in structural applications. Idea being a general weight cost savings over numerous mainly permanent joints.

I concur 100% with threaded fasteners for moving parts and modular mechanism user interfaces ToddF: Here are my observations based on previous experience. Please fix my misconceptions 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 setups which are expected to be long-term.

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

Screws in tension 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 since they are improperly sized (reach is wrong or hole size is incorrect). Rivets just loosen in stress if there is a shock load on them.

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If you expect heavy shock loads, use threaded fasteners (with Loctite) (Grk Fasteners). ToddF: Rivets of comparable strength to threaded fasteners (tension and shear) do not use considerable weight savings. Corollary: Changing 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) The majority of threaded fasteners are solidified steel.

For the same strength the rivet will generally weigh 2/3 the weight of screws. ToddF: Rivets are most useful and have the most possible for weight savings when joining really thin products (ex 1/16" thick aluminum) which can't be tapped. Rivets tend to be useful on thin product 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 removed.

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The same holds true for screws. Soft material must constantly have washers to spread out the load of the fastener (no matter type). Hope that helps. So as a basic basis on my team, rivet if it is non-essential, and bolt it if it is important. 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, simply because we can't fit a rivet weapon head where we desire it. And if you do utilize bolts, remember to either usage locknuts, or locktite on regular threaded nuts. We likewise bolt parts that need no, or near to zero, lossesning throughout the season, since if the hole is not best for the rivet, the rivet will lossen, where ever the force.