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Generic tubing lugs
I want to build a contraption out of brazed 1/4" steel tubing. I
can't find any manufactured lugs in this size. Actually, this is the first time I've looked. I suppose I could start with a pipe fitting and drill out the threads. I'd rather find the real thing, though. Has anyone else ever looked? Successfully, I mean? Jones |
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#2
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Generic tubing lugs
On Oct 6, 8:32*pm, !Jones wrote:
I want to build a contraption out of brazed 1/4" steel tubing. *I can't find any manufactured lugs in this size. *Actually, this is the first time I've looked. *I suppose I could start with a pipe fitting and drill out the threads. *I'd rather find the real thing, though. Has anyone else ever looked? *Successfully, I mean? Jones http://www.google.com/search?source=...339l1.2.8l11l0 try Mcmaster-Carr hardware online from Chicago but this would be copper, generally. |
#3
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Generic tubing lugs
!Jones wrote:
I want to build a contraption out of brazed 1/4" steel tubing. I can't find any manufactured lugs in this size. Actually, this is the first time I've looked. I suppose I could start with a pipe fitting and drill out the threads. I'd rather find the real thing, though. Has anyone else ever looked? Successfully, I mean? Any particular reason you don't want it fillet brazed? I made up a piece once with 24 T and X joints brazed in square 1/4" tube which held up uneventfully and was quick to do in a small fixture. Get your joints mated well and clean the steel first and you should be OK. If you're set on sleeved joints, weld them from 1/4" ID steel tube. That's how Cinelli and Pogliaghi made classic tandem lugs before SCM. -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#4
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Generic tubing lugs
On 10/6/2011 10:32 PM, !Jones wrote:
I want to build a contraption out of brazed 1/4" steel tubing. I can't find any manufactured lugs in this size. Actually, this is the first time I've looked. I suppose I could start with a pipe fitting and drill out the threads. I'd rather find the real thing, though. Has anyone else ever looked? Successfully, I mean? Jones -Hardware store pipe and fittings (meant for carrying liquid or gas internally) is thick & heavy, but is all WAY too soft for structural use. -If you are in the USA, the metal you want is 4130 steel. In other countries the same alloy will have different names/designations. -Welding the steel directly is easier to do than fillet brazing, but welding doesn't look quite as nice. But brazing and having it look nice takes practice, so don't feel bad if the project looks lousy the first try. Just be happy it holds together.... -Are you making a bike rack? For direct welding, I would recommend 1/4" OD x .080" thick for the longer pieces and 3/16" x .065" wall for shorter pieces. http://www.norcom2000.com/users/dcim...sion_rack.html |
#5
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Generic tubing lugs
On Fri, 07 Oct 2011 08:04:02 -0500, in rec.bicycles.tech DougC
wrote: -Are you making a bike rack? Yeah... sort of. That's the best two-word description. I doubt you or anyone else wants an essay. I'm going to attempt to put a 20" electric hub onto a BOB-style trailer device. I don't want to ask for advice on that because giving it might make you responsible for adverse consequences. Yes, it will "jack-knife" under excessive power... and that would probably be called an "adverse" situation. |
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Generic tubing lugs
!Jones wrote:
On Fri, 07 Oct 2011 08:04:02 -0500, in rec.bicycles.tech DougC wrote: -Are you making a bike rack? Yeah... sort of. That's the best two-word description. I doubt you or anyone else wants an essay. I'd agree with Andrew, and go for fillet brazing. I've never come across any lugs as tiny as 1/4". And I doubt I'd be successful trying to fabricate my own. Your steel tubing is probably not going to be high alloy, work-hardened stuff that would benefit from minimal heat, so you probably wouldn't see any benefit from lugs. Alex Wetmore's blogs have shown some pretty detailed rack building procedures, such as custom porteur racks for heavy loads. You might get some good ideas there. Unfortunately, it's difficult for me to find those particular pages when I browse his blogs, but you might be more motivated than I. -- - Frank Krygowski |
#7
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Generic tubing lugs
also possible after figuring loads - cut square tubing 45 degrees or ?
with jig, then jig and epoxy solid at junction. triangle joint with flate plate. |
#8
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Generic tubing lugs
On 10/7/2011 10:30 AM, !Jones wrote:
On Fri, 07 Oct 2011 08:04:02 -0500, in rec.bicycles.tech DougC wrote: -Are you making a bike rack? Yeah... sort of. That's the best two-word description. I doubt you or anyone else wants an essay. I'm going to attempt to put a 20" electric hub onto a BOB-style trailer device. I don't want to ask for advice on that because giving it might make you responsible for adverse consequences. Yes, it will "jack-knife" under excessive power... and that would probably be called an "adverse" situation. Oh, I'm /never/ responsible. People on my street call me 'the Teflon Dunce' :) I know of no commercially-made examples, but I've seen online that a lot of people build motorized trailers. If the trailer & hitch is strong enough I know of no horrible side-effects. Building a solid hitch is where most people seem to have issues (with all kinds of trailers, not just motorized ones) but having access to any kind of welding method would help a lot with that. What a lot of people do is they take the front wheel+fork off of a scooter or pocket bike, add a tongue that hitches to the bicycle somehow, and then add a longer throttle control. |
#9
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Generic tubing lugs
On Thu, 06 Oct 2011 23:27:58 -0500, in rec.bicycles.tech AMuzi
wrote: Any particular reason you don't want it fillet brazed? Simple answer, really... I've never done it. Jones |
#10
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Generic tubing lugs
On Fri, 07 Oct 2011 11:50:29 -0400, in rec.bicycles.tech Frank
Krygowski wrote: Alex Wetmore's blogs have shown some pretty detailed rack building procedures Who? I'll Google it and read. Jones |
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