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Multi plane bending help

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发表于 2022-11-22 15:51:23 | 显示全部楼层 |阅读模式
I’m bending a lean bar for a raft frame and I’m having trouble visualizing and calculating the out of plane bends.  Any guidance on how to calc these out of plane bends?  My guess is that the two parallel legs should be clocked at 45 degrees to the center two bends and bent to 22.5+45= 67.5 degrees.See the real like example of what I’m trying to replicate and the wire mock-up I made.working on getting those images uploaded....Last edited by BavCar; 1 Day Ago at 11:27 AM.
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Reply:Like where this is going, throw in some more dimensions and will plug them in the apps (well between meds)Retired Old GuyHobart 210Lincoln AC/DC 225/125 Evolution 14” Saw
Reply:Have you done a 45 on the bender to see where it starts and how much it tube it consumes.  With that you can lay the starts out on straight pipe.  And determine spacing.JD2 has a nice simple tutorial procedure.
Reply:I’d love to understand how to do this by hand and not by software but I suppose I could back check based on the software.  Call it an even 19” between bend points.  Bends are 6” clr and 1.66od (1.25” sched 40) pipe.  The 45 bends take up 6.5” of pipe and yes I have done plenty of bends to layout single plane bends.  My issue is calculating the out of plane bends.  I don’t do out of plane bends often.  My calcs are if the bend is rotated 45 out of plane, I should have a 45/90=.5 compensation per degree.  So 45*.5+45Anyone following what I’m doing here?
Reply:Just FYI, none of your angle measures (on the wire model) are even remotely correctly labeled.   I get what you're trying to "do", but what you're trying to do and what is labeled on the picture are not the same thing.  I think this is where your confusion lies.  Angles are formed when two lines or line segments meet at a vertex AND the interior & exterior are defined.  Pointing an arrow at a corner and designating an angle measure is not meaningful in any way.  Establish your line references, then look at a simple school protractor and you will see how your "angle pointing arrows" do not mesh with reality.

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Originally Posted by BavCar

I’m bending a lean bar for a raft frame and I’m having trouble visualizing and calculating the out of plane bends.  Any guidance on how to calc these out of plane bends?  My guess is that the two parallel legs should be clocked at 45 degrees to the center two bends and bent to 22.5+45= 67.5 degrees.See the real like example of what I’m trying to replicate and the wire mock-up I made.working on getting those images uploaded....
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