Landracing Forum

Tech Information => Technical Discussion => Topic started by: floydjer on February 10, 2010, 09:20:53 AM

Title: Interesting tube joint
Post by: floydjer on February 10, 2010, 09:20:53 AM

Note how the diagonals were installed.

Title: Re: Interesting tube joint
Post by: SPARKY on February 10, 2010, 10:47:01 AM

I wonder if that was so they could weld the joint on the inside of that tube intersection?

Title: Re: Interesting tube joint
Post by: Rex Schimmer on February 10, 2010, 10:58:14 AM

Floyd,
I see you have been looking at the thread I posted to the off road fabrication site. That is a trully beautiful joint, they call them "nodes" but I could not even imagine making one of these by hand. Perfect "concentricity" and fit. As I understand they have a robot and a laser cutter that trim the tube ends for this type of perfect fit. The off road guys are certainly the leading fabricators of tube race car chassis these days.

Have you looked at the "bulkhead" joint designs?? Very interesting stuff. Great looking shop too.

Rex

Title: Re: Interesting tube joint
Post by: floydjer on February 10, 2010, 11:44:12 AM

Sparky, That`s what I figured too. Rex.........Hmmmm......Think I stole it from Metalmeet...Maybe :cheers:JERRY

Title: Re: Interesting tube joint
Post by: Freud on February 10, 2010, 11:55:16 AM

Foydjr

Excellent Foto.

FREUD

Title: Re: Interesting tube joint
Post by: willieworld on February 10, 2010, 01:38:41 PM

ive done diagonals like that before---it wasnt for welding---it was for tube placement---after the fishmouth (cope) is made one side is cut off so the tube will fit ---sometimes thats the only way to get it to fit in   willie buchta

Title: Re: Interesting tube joint
Post by: Rex Schimmer on February 10, 2010, 01:39:16 PM

FLoyd,
Try this thread to a off road web site. This specific thread is from a guy that is building off road trucks at the Herbst shop. You will see your picture in it plus many more very interseting fabrication methods.

Rex

http://www.race-dezert.com/forum/showthread.php?t=31417

Title: Re: Interesting tube joint
Post by: robfrey on February 10, 2010, 02:16:12 PM

That is a beautiful joint!

Title: Re: Interesting tube joint
Post by: Seldom Seen Slim on February 10, 2010, 02:21:37 PM

I'll say it before someone else does -- Rob, that sounds like something I would have said back in the day.  Yeah, man, I see it, too.

Title: Re: Interesting tube joint
Post by: JoshH on February 10, 2010, 03:06:39 PM

Anybody interested in fabrication should have a look at the link Rex posted. Go through all the pages; these guys are SEROUS....

Thanks for sharing!
Josh

Title: Re: Interesting tube joint
Post by: hitz on February 10, 2010, 03:32:44 PM

That's like a old common tube aircraft joint. They called them cluster joints and all of the tubes center lines point to the same point. They were oxy/acet.welded then and welded after all the tubes were prepared and positioned. Very nice isn't it.

harv

Title: Re: Interesting tube joint
Post by: johnneilson on February 10, 2010, 03:59:40 PM

I think Willie has the correct answer, those tubes needed relief to be placed and then completed.

As a note, someone mentioned laser/plasma cutting the fishmouths. I was into Karting deeply for some years, the manufacturers have a machine that feeds a length of tubing through the throat, uses a laser to cope the end rotates it and then bends the tube. Since the chassis parts are a single pc with multiples of bends and orientations. Fantastic to see the videos.

It is too bad that that joint will be painted or powdercoated, a work of art.

John

Title: Re: Interesting tube joint
Post by: Rex Schimmer on February 10, 2010, 08:13:06 PM

Pics of truck frame that this joint is on.

Rex

Title: Re: Interesting tube joint
Post by: jdeleon on February 10, 2010, 10:47:07 PM

Incredible work!   I spent a couple hours just looking the pictures.

Title: Re: Interesting tube joint
Post by: panic on February 11, 2010, 01:20:17 PM

IIRC that's what Yetman bike frames looked like 45 years ago; Tony Foale has done similar.

Title: Re: Interesting tube joint
Post by: oz on February 11, 2010, 01:40:38 PM

Wow nice work Beautiful welding!