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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Notch, Bend, Braze at 90 deg -- Conduit or Tubing: What Depth
Hi!
No grand schemes today, nor political commentary, I am OT (On Topic). I'm building a seat frame suppoort for my MOEPED. It must be 16 inches OAL (overall length) and the legs are 3 inches long. The existing part is neatly bent from stainless, but those broad curves mean I can't mount the underseat lighting. (OSS: overseat steering, means my hands and legs don't block the beams) I've used up THREE one-yard lengths of 3/4 inch OD by 1/16 inch wall mild steel tubing from Home Depot so far. It's time to ask for help. I've mitered the mating ends at 45 degrees, ground them flat, added fixturing holes. and proceed to braze: the alignment screws up. Tie wire stretches during brazing, and a clamp I made still allowed slipping. I've notched the tubing deeply leaving a thin tag. When bent closed, the tag area is still open; the bronze doesn't fill a gap that wide. I think if I notch the tubing leaving a wider tag then when bent, the stretch on the far side will close the gap, but HOW DEEPLY? You see, when bent, the far side gets stretched and the V opens up laterally. Imagine a tube bent but not notched: it would widen to half- circumfrence. So there is behavior related to depth of notch I don't want to trial a whole lot of different bend depths, but I can. There's scrap to do this with. Have any of you here got some experience with this? Is there a magic number for this configuration? Can I compute it without FEA (finite element analysis)? Doug Goncz Replikon Research Seven Corners, VA 22044-0394 |
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Notch, Bend, Braze at 90 deg -- Conduit or Tubing: What Depth
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Notch, Bend, Braze at 90 deg -- Conduit or Tubing: What Depth
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Notch, Bend, Braze at 90 deg -- Conduit or Tubing: What Depth
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