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Old Streetfighter Motorcycle Forum Post 07-02-2019, 03:23 PM   #1
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Default Swingarm

So not 100% in the sssa might change it up... Again... Thinking about an old JMC copy.. Cuz well.. Yeah..

Is bending 2x3 rec. Hard? Never tried.. Would anyone be up to make one?
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Old Streetfighter Motorcycle Forum Post 07-02-2019, 04:03 PM   #2
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Default Re: Swingarm

never tried, die be easier to make than round, if it works

not just notch it, bend and weld up?
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Old Streetfighter Motorcycle Forum Post 08-06-2019, 02:13 PM   #3
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Default Re: Swingarm

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Originally Posted by yantosh View Post
never tried, die be easier to make than round, if it works
not just notch it, bend and weld up?
Yeah, with a bit of difference. About thirty years ago I figured a way of bending square / rectangular tubing while maintaining strength and presenting a good curved profile instead of sudden bends.

It takes a bit of elementary math to determine the radii of the cuts, but once you get it figured out is goes pretty quick.

The lower image is the straight tube cut for bending. Notice that the outer surface is uncut, and the outer metal bends guided by the radiused cuts, giving a good clean profile and little if any gaps to fill as long as you are diligent during the layout.

If you are interested in doing this I can elaborate on the method. There is also a good way to make intricate gussets using concrete as a buck.

Rob
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Old Streetfighter Motorcycle Forum Post 08-07-2019, 03:11 PM   #4
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Default Re: Swingarm

Quote:
Originally Posted by RTharalson View Post
Yeah, with a bit of difference. About thirty years ago I figured a way of bending square / rectangular tubing while maintaining strength and presenting a good curved profile instead of sudden bends.

It takes a bit of elementary math to determine the radii of the cuts, but once you get it figured out is goes pretty quick.

The lower image is the straight tube cut for bending. Notice that the outer surface is uncut, and the outer metal bends guided by the radiused cuts, giving a good clean profile and little if any gaps to fill as long as you are diligent during the layout.

If you are interested in doing this I can elaborate on the method. There is also a good way to make intricate gussets using concrete as a buck.

Rob
Would you should do a separate thread about this? Id be interested how it works for sure.

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They can ban, outlaw, and restrict whatever they please. I'll keep doing whatever the fuck I'm doing, because I don't really give a shit. The only thing that will change is that I'll be breaking their made up bullshit rules while doing it, and I'm comfortable with that.

My Build http://www.customfighters.com/forums...d.php?t=118649
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Old Streetfighter Motorcycle Forum Post 08-12-2019, 09:33 AM   #5
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Default Re: Swingarm

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Originally Posted by XxGRYMMxX View Post
Would you should do a separate thread about this? Id be interested how it works for sure.
Working on it. It will take some time as while I have done it quite a few times, have never tried to do a comprehensive write up. Quite a few fine points to cover.

Rob
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