posted
You can bend the tube, you just have to do it uniformily - try filling it with sand before you bend it. I'll be like trying to bend a 1" piece of solid, but if you bend it as such, it should behave as a "solid" bar, even though it's hollow.
I've seen this done with steel.
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And we're just getting started... -=[Project dB / Maxxsonics / Atomic / American Bass]=- Onward to next season! Posts: 487 | From: Wisconsin | Registered: Feb 2006
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posted
have you guys tried a pipe bender? electricians use them on hollow pipe/tubing for conduit, I know the physical properties are different but it might work.
I install copper pipe for a living so I use this method for bending copper pipe it might help.
place one end of the pipe in vise just tight enough to hold it still, then I heat up the top of the pipe untill it just starts to glow red, I then work the heat further down the pipe towards the end of my bend, while slowly bending the pipe with a little down ward pressure, push to hard and it will kink, what I am actually doing is strecthing the copper in the bend. I have never been able to get more than a 45* degree bend this way as the pipe will either kink or melt.
posted
SacMustang: Exactly! With thin walled steel you can bend it all over the place, but with thickwalled steel (much like aluminum and copper), if you try and bend it too much, it'll crack or kink, depending on if it's heated or not. When I saw the sand trick done, they heated the pipe with a torch after it was filled and used a pipe bender with a looooooong extension and slowly bent in a 100deg bend. All the guy told me was that the sand helped to keep everything "even", so it wouldn't kink up when the angle got to high.
Don't know much about it myself, I just saw it done.
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And we're just getting started... -=[Project dB / Maxxsonics / Atomic / American Bass]=- Onward to next season! Posts: 487 | From: Wisconsin | Registered: Feb 2006
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posted
well Deaftones is trying to bend aluminum pipe/tubing.
copper doesnt bend well without heat, it will kink unless you have soft copper pipe (which is double the price of normal copper pipe(very expensive stuff))
@ work I have bent 1/2" all the way up to 2-1/2" any thing bigger than that requires way to much work and would be cheaper just to buy the fitting.
posted
nah, i'm not looking to bend tubing...the exact opposite actually...trying to keep it FROM bending
what i'm thinking about is the structural integrity of the metal. essentially, "the bigger the radius, the thinner it can be" is what i've overheard(?)
say for example: if i'm looking to fabricate something that's going to be under a bit of stress/pressure...i need to think about it's durability....i need to make it so it won't bend. so if i'm using aluminum tube..i've basically got two choices here...hollowed out or solid core....
so going off what i overheard....
"the bigger the radius, the thinner it can be"
a 2" in diameter hollowed out aluminum tube with a 1/16" wall is MORE STRUCTURALLY SOUND (as well as a hell of a lot lighter) when comparing it to say a .75" solid core aluminum tube(?)
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posted
Yes, you are looking for the structural moment of inertia value in that application. A hollow pipe of 2" diameter with a thin-wall will usually handle more stress with less deflection. If you are hanging, or mounting, something to the pipe, the thin-wall will be susceptable to localized stress and prone to failure depending on the application. I am a mechanical engineer and work with aluminum all day. Get a hold of me with a specific application, and I will try to help if I can.
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