[Seriously_Tho]

I have some split tube I'd like to weld bolts to. What are these things called & where would I find some weldable lugs? Is there a trick for fabb'ing something simple? Considering cutting some coupling nuts in half & drilling one side out. Ideas?

I've Googled the bejeezus out of pinch bolts, clinch bolts, binder bolts, etc - nothing so far.

[79jasper]

Hmmm. Haven't really seen much like that.
Could it be a thick socket cut in half?

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[GreinTime]

More like someone broached the ends I would think. It doesn't appear to be an impact style socket, purely due to the coloring, but its a cool idea regardless. I would talk to a local machine shop or if you have any machinist friends see if they could make something similar. That is actually a relatively common practice in other applications, more so plastics than metal like that, but an interesting concept nonetheless.

[WerkSpace]

Wade, you can find them here,
http://ritetechoutsourcing.com/projects/tubing.html

[coldman]

I spotted these at a plant I was working at today. Don't know if it helps:

M1.jpg (49.25 KiB) Viewed 1016 times

M2.jpg (54.78 KiB) Viewed 1016 times

[Seriously_Tho]

I later found these at a bicycle frame builder's website - http://www.cycle-frames.com/bicycle-fra ... TERED.html



And it'll probably work for my purposes here. It just seems like it would be a common thing with lots of sizes for bolts & different miters for various tube diameters.

[Seriously_Tho]

Another at the same site, a lot more beveling at the base -



http://www.cycle-frames.com/bicycle-fra ... T-SET.html

[WerkSpace]

I'm curious if anyone knows of any 'Free Software'
for constructing tube structures such as this one.
http://www.bikecad.ca/

[Seriously_Tho]

There are lots of good free CAD programs out there, Google Sketchup being a real favorite. Nothing I know of is specialized for 3D tube structure.