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I cropped this out of one of airframefixr's threads:

What's this type of tube end called? I see it all over airplanes and racing cars.

Don't know what it is called, but I just weld a washer on the end of the tube, and you have a solid mount.
Just make sure the socket fits. Here is my fender mount.

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Martin


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That's the same style connection we used to mount the rear diff cover on SeattleTom's Car9. I don't know of a name for it, maybe "standard practice"? I think you need to scale the material there for the load a bit. For the diff mount I think we used heavier tube and a piece of plate cut with a hole saw?

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We refer to them as mounting cups over here , I have also heard them referred to as thimbles .

Bob

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Mancave http://s1116.photobucket.com/user/mypic ... ow/mancave

Now that I have some search terms I'll see if I can find some design information. Thanks guys!

edit: got one hit on "mounting cup" from a book on chassis welding. Nothing on thimble. I was using combinations of those with airframe, tube, steel, end, and weld. Aargh.

So far no specific names have come up. One of Carroll Smith's books has a picture and calls it a "tube end." Sigh.

As its affecting your life I will ask a friend that will know , in the absence of the correct terminology a " spunkle trumpet " covers most things this side of the pond

Bob

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Mancave http://s1116.photobucket.com/user/mypic ... ow/mancave

Its a mounting ferrule according to my mate that works with this stuff all day, buuuuuuuuuuuuuuuuuuuuuuuuuuuuut he calls them buckets


Bob

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Mancave http://s1116.photobucket.com/user/mypic ... ow/mancave

I have no idea what they're called, but it works great for a lot of things. I've made them from solid bar stock on the lathe too. Drill through and countersink for an Allen head cap screw and weld to the thicker part where the shank of the bolt goes through. Would be a bit time consuming on bigger stuff though.
Kristian

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What I'm looking for is dimensioning and load capacity data. These things - whatever they're called - *must* have such data available, since they're used in aircraft structures.

As these joints seam to be custom to application you may need to do the calcs yourself. But i have used a lot of these and some have had some serious stress on a vibe table. They are ridiculously strong joints

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I simply must start using "spunkle trumpet" in my day to day conversations. Much more technical sounding that "whatchamacallit".

Of course, if you need to align your sperving bearings... https://www.youtube.com/watch?v=Ac7G7xOG2Ag

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-Keith

It probably isn't something that you can easily calculate by hand but I would guess that the weakest point is the weld where the two pieces of tubing attach assuming you use a fairly thick piece of plate and a properly sized bolt. Throw in a decent safety factor and you should be fine.

If you're really worried, adding a second piece of plate to cap the open end of the tube will also make it stronger since it will more evenly distribute the load across the entire piece of tube. Plus you won't have to worry about picking bolt/socket/tube sizes that fit since the head will be outside.

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-Andrew
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Andrew is quite correct.
However, there is a small difference between the two different types. The first, which I have used on my fender mounts, is called the Schweisswurzel Drehscheibe, and allows full torque.

The second, also known as the Oichkatzelschweif Scheibe, does not allow full torque. And I have used it here

Hope that clears up the nomenclature issue from across the pond and then across the Chanell.

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Martin


My build log:
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My build video:
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What is the logic behind the second not allowing full torque? The end plates deform?

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