Would you ride this frame?
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Would you ride this frame?
Custom Bicycle Frame ? Aesthetics of Design
Doing a bit of googling and stumbled across this article. I thought you might find it interesting/amusing :-)
Doing a bit of googling and stumbled across this article. I thought you might find it interesting/amusing :-)
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As I read this blog I noted the various mistakes in the tubing and lug references but then the shot of the welded lugs came up and my heart skipped a beat. Not sure I'd want to be seen riding this frame
This blog does show the new generation coming to frame building that has little exposure to the traditional ways, design and execution. For better or worse... Andy
This blog does show the new generation coming to frame building that has little exposure to the traditional ways, design and execution. For better or worse... Andy
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The owner is gonna die and it will improve the species.
rejecting tradition is the way of designers everywhere. That's how new things happen. But it also means they are constantly learning the lessons that others have learned many times before them.
rejecting tradition is the way of designers everywhere. That's how new things happen. But it also means they are constantly learning the lessons that others have learned many times before them.
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I am more concerned about the grinding than the welding. The welded joints weren't pretty, but they appear to be good enough to make a rideable frame. His attempts to smooth out the welds by grinding have undoubtedly removed material from the tubes and compromised their strength.
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The lugs made this process very forgiving as they hid any sloppy cuts I had, and held everything in place. It was then time to begin welding.
Those are long weld joints with a lot of material that is welded.
So poorly fitted, and covering it up with welding, grinding, and tapering the welds so almost all the added weld material is gone.
I believe the lugs are designed to have internal support from the brazing/soldering material. So, in this case, almost all the lug support is at the tips of the deeply ground welds.
I don't know, I might ride it, watching it carefully, but I'd certainly be concerned about the joints, and would inspect it regularly.
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As I read this blog I noted the various mistakes in the tubing and lug references but then the shot of the welded lugs came up and my heart skipped a beat. Not sure I'd want to be seen riding this frame
This blog does show the new generation coming to frame building that has little exposure to the traditional ways, design and execution. For better or worse... Andy
This blog does show the new generation coming to frame building that has little exposure to the traditional ways, design and execution. For better or worse... Andy
You're telling me he went to all this trouble but didn't research how to join everything? Then he goes on to state that he'll be brazing on some other bits?
Besides grinding away the welds I'd be worried about the metal fatigue from the heat.
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Columbus Max Niobium Steel
Niobium is a special steel with Manganese, Chrome, Nickel, Molybdenum and Niobium,
I'm not seeing anything that specifically notes whether or not it is considered a weldable alloy.Ahh, found it in the catalog.
Material suggested for TIG welding: OKTIGROD 13.12 (AWS 5.28 ER 80S-G)
The MIG wire probably isn't the Columbus suggested wire, but the typical MIG/TIG wires tend to be very hard, and probably would be fine in itself.That appears to be MIG welding, but not a bad looking bead for many of the welds, and should be little different in effect at the welds from pure TIG welding the frame.
Except, of course, the style of welding and grinding.
One other note. Trapped moisture, and especially trapped salts could do nasty things to that frame.
Last edited by CliffordK; 04-19-19 at 10:02 PM.
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he did have a picture of Max, but then he said it was standard dimensions. Which would mean SL, I think. Same tubing material though. I suspect there will be bondo involved in the finish. I thought the welds looked reasonably good except at the ends of the beads. Couldn't really tell what was going on there. But when he ground them down it seemed like they were okay. If it starts cracking, it's going to be at one of those points.
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I am more concerned about the grinding than the welding. The welded joints weren't pretty, but they appear to be good enough to make a rideable frame. His attempts to smooth out the welds by grinding have undoubtedly removed material from the tubes and compromised their strength.
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seems like it is student work. The prof is in mechanical engineering.
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But, of course, that could have been done with either Filet brazing or Nova sells an internal lug set.
https://www.cycle-frames.com/bicycle...ZE-FRAME-.html
Or, one could do traditional brazing the joints, then filet out slightly beyond the end of the lug and smooth it down to a nice taper.
FrameBuilders Supply also sells blanks that might be easier to shape as desired.
https://framebuildersupply.com/collections/lugs
I suppose an advantage of brazing lugs is it is easier to visualize material layers when finishing.
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