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Suggestions for securing coupler to payload tube with very thick FG.

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Bat-mite

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Up till now, I have secured my coupler to the payload tube using these or similar (Grainger, McMaster, Zoro, Amazon).

I drilled my Formula 200 with five 1/4" holes, dropped the coupler into payload tube, and tried to stick in a rivet. Woops. The material thickness is 0.29 inches, which greatly exceeds the 0.217-inch maximum for these rivets.

For the life of me, I can't find longer ones anywhere! And I have looked at other kinds of push-in rivets, but none of them seems like a good alternative.

I guess I could use weld nuts and screws, but that is more of a pain than pushing in a rivets.

Any suggestions, or does anyone know where I can get snap-in rivets with a 1/4" shaft and longer shank?
 

Onebadhawk

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John,
I'll agree that the build is more time consuming
to epoxy a steel nut ( pem, weld, or tee ) in place on the inside of the coupler tube...
But after that's done I don't think the steel screws are more difficult....
I've switched and wouldn't go back to plastic rivets again. ..

Teddy
 

Tonimus

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Get in there with a large drill bit and drill the backside until it is only 0.217" thick. Or a dremel with a sanding drum.
 

fyrwrxz

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Up till now, I have secured my coupler to the payload tube using these or similar (Grainger, McMaster, Zoro, Amazon).

I drilled my Formula 200 with five 1/4" holes, dropped the coupler into payload tube, and tried to stick in a rivet. Woops. The material thickness is 0.29 inches, which greatly exceeds the 0.217-inch maximum for these rivets.

For the life of me, I can't find longer ones anywhere! And I have looked at other kinds of push-in rivets, but none of them seems like a good alternative.

I guess I could use weld nuts and screws, but that is more of a pain than pushing in a rivets.

Any suggestions, or does anyone know where I can get snap-in rivets with a 1/4" shaft and longer shank?
Bat- Pm me your addy-I may have a solution. No- you can't order these as I found them in an electronics salvage recycling place. They get crap from local shops when they switch product lines. San Diego used to be a big aerospace hub, so you can find all kinds of interesting garbage to re-purpose.
 

Bat-mite

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Get in there with a large drill bit and drill the backside until it is only 0.217" thick. Or a dremel with a sanding drum.
Not sure what that does to the structural integrity during ejection charge ignition. Doesn't seem worth the risk.
 

Bat-mite

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Bat- Pm me your addy-I may have a solution. No- you can't order these as I found them in an electronics salvage recycling place. They get crap from local shops when they switch product lines. San Diego used to be a big aerospace hub, so you can find all kinds of interesting garbage to re-purpose.
Thanks. That is very kind of you. But I am going with weld nuts and screws. Ordered yesterday from McMaster and they are already on the UPS truck for delivery today! :jaw:
 

fyrwrxz

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Thanks. That is very kind of you. But I am going with weld nuts and screws. Ordered yesterday from McMaster and they are already on the UPS truck for delivery today! :jaw:
It's all good , brother. Yours for the asking, anytime.
 
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