Mechanical Fasteners in

Published Feb 05, 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 very first reaction was unfavorable, however I found myself unable to articulate a truly excellent explanation why we need to use fasteners over rivets. Bulk Fasteners.

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Would anybody be willing to share their engineering based viewpoints about the benefits and drawbacks of using rivets vs threaded fasteners in FIRST robots? Exist certain applications where your group prefers one type over another? Do you have certain design rules, tools, specific rivet part numbers, etc. which you utilize successfully? Would you, for instance, usage rivets to attach a plate gear to a versahub? Why or why not? We have actually utilized rivets sporadically in the past, however it constantly seems that by the end of competitors season, lots of, if not all of them have actually been drilled out and changed with threaded fasteners.

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 robot, you ought to use threaded fasteners. Rivets should be used for setups which are anticipated to be long-term. Rivets are best in shear applications.

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Rivets of comparable strength to threaded fasteners (stress and shear) do not use significant weight cost savings. Corollary: Replacing a threaded fastener with a lighter rivet leads to minimized strength because joint. (The exception might be if use of a rivet leads to the elimination of a nut) Rivets are most beneficial and have the most potential for weight savings when joining extremely thin products (ex 1/16" thick aluminum) which can't be tapped.

Anyone care to share their experiences? I'm expecting more comprehensive responses than "We utilize rivets. They work excellent 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 cost savings over several primarily irreversible joints.

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

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If you know you need to remove a part to service it (or another part) then use threaded fasteners. ToddF: Rivets are best in shear applications. If utilized in tension applications, they tend to loosen up with time, and aren't easily re-tightened except by drilling out and replacing the rivet.

Screws in stress have stress risers at the threads which can trigger the thread to fail. Threaded fasteners tend to loosen due to vibration. Rivets tend to loosen because they are improperly sized (reach is incorrect or hole size is incorrect). Rivets only loosen in stress if there is a shock load on them.

If you anticipate heavy shock loads, utilize threaded fasteners (with Loctite). ToddF: Rivets of similar strength to threaded fasteners (stress and shear) don't offer substantial weight savings. Corollary: Replacing a threaded fastener with a lighter rivet leads to decreased strength because joint. (The exception might be if usage of a rivet results in the removal of a nut) A lot of threaded fasteners are hardened steel.

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For the exact same strength the rivet will usually weigh 2/3 the weight of screws. ToddF: Rivets are most beneficial and have the most possible for weight savings when joining extremely thin products (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 right, nevertheless, rivets also save weight when the strength of steel screws are not required and nuts can be gotten rid of.

The exact same holds true for screws. Soft material should constantly have washers to spread out the load of the fastener (despite type). Hope that assists. So as a basic basis on my team, rivet if it is non-essential, and bolt it if it is necessary. 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 gun head where we desire it - Corrugated Fasteners. And if you do utilize bolts, remember to either use locknuts, or locktite on routine threaded nuts. We also bolt parts that require zero, or near 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.

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