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Originally Posted by MrForbes;1415752[B
]I guess I have understood the problem too long, I never even consider using a thru bolt on a piece of thinwall tubing.[/b] We use a lot of thin wall tubing, but we always figure out another way to attach it. Usually it's done with a gusset of similar thickness to the tubing wall, attached with several small rivets.
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I'm in this boat. Rivnuts, weld nuts, access ports, pop rivets, brackets etc all work well to solve this problem without the need to create additional parts to brace tubing. Most of these methods save weight, time, cost, and complexity vs some sort of insert.
Rivnuts, when installed properly in the right-sized and
de-burred hole, work like a champ. No need for loctite or glue. We used dozens of them on our 2014 robot with great success.
In a few situations where I have 'needed' to put a bolt through a tube (thin-walled or not) I will weld an insert into the tube to support the fastener. But I haven't 'needed' to do this in FRC though.