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Old 03-06-2017, 02:24 PM
sandmanred sandmanred is offline
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Default Method for making bicycle fender?

What methods might work for a bicycle fender? I'm thinking about 2 inches wide with 1.25 inch profile radius and a wheel diameter of 26 inches. It's too narrow for me to get on my wheel.

I have or can make any kind of dollies or hand tools suggested.

I'd likely be working 5052 0.060 inches thick or maybe .040.
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Last edited by sandmanred; 03-06-2017 at 02:37 PM.
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Old 03-06-2017, 04:01 PM
Kyle_H Kyle_H is offline
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I would say, cut a strip the entire size, mallet and sandbag the crown you want into it. use a shrinker to bring the longways radius tight enough. and cross wheel it smooth. but it is too narrow to fit in your wheel you say?
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Old 03-06-2017, 06:36 PM
sandmanred sandmanred is offline
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Quote:
Originally Posted by Kyle_H View Post
I would say, cut a strip the entire size, mallet and sandbag the crown you want into it. use a shrinker to bring the longways radius tight enough. and cross wheel it smooth. but it is too narrow to fit in your wheel you say?
I could probably cross-wheel but not wheel the long axis. And no shrinkers so I think maybe a really small pocket in a stump for shrinking edges?
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Old 03-06-2017, 07:29 PM
Oldnek Oldnek is offline
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If you have a bead roller you can possible adapt a ripstick wheel and skateboard wheel on top.
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Old 03-06-2017, 07:47 PM
steve.murphy steve.murphy is offline
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Could you make a solid form/buck from wood/plywood and work the metal down from the top side. You would have to work out the tucks that form along the edge.
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Old 03-07-2017, 10:34 AM
billfunk29 billfunk29 is offline
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Default Three piece

A trick I learned from Peter Tommassini for shapes like this. It works ammazingly well. Maybe Peter can offer a better explanation.
fender.jpg
fender1.jpg
fender2.jpg
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Last edited by billfunk29; 03-08-2017 at 07:03 AM. Reason: add photos
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Old 03-12-2017, 11:44 AM
weldtoride weldtoride is offline
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Quote:
Originally Posted by sandmanred View Post
What methods might work for a bicycle fender? ....

I have or can make any kind of dollies or hand tools suggested.
Do you have an arbor press? There was a very nice article in Street Rodder magazine a few years back, showing Bob Haverstock using clever dies from mdf, as I remember, to press motorcycle fender shapes with an arbor press.

I went looking for back articles thru http://www.hotrod.com/street-rodder-magazine/ just now, and with each new owner, the search function for these magazines degrades in results and increases in frustration for me. Your results may differ.

However, a HAMB search turned up more results, but an unfortunate broken link to aforementioned Street Rodder article. At least the HAMB thread gives the issue: Nov '09

http://www.jalopyjournal.com/forum/t...orming.522563/

As I remember the article, Bob made mdf dies similar to what Pullmax dies would look like to shape the fender in cross section, and then used his arbor press as a very slow version of a Pullmax.

Google search: Bob Haverstock arbor press and some images come up, including

https://gulleyperformancecenter.com/tooling-forming/ the Gulley die is not how I remember the article, but I have been known to forget. Gulley also sells a video

Also Google: low pressure sheet metal forming, that will also yield results

Hope this sends you down the right WorldWideWabbit hole, not the wrong one.
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Last edited by weldtoride; 03-12-2017 at 11:48 AM.
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Old 03-12-2017, 01:11 PM
weldtoride weldtoride is offline
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more info over here:

http://www.metalmeet.com/forum/showt...essure+forming

Also dug out my paper copy, here's the meat of the article, turns out I was remembering and confusing two different processes from the same article.



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Old 03-12-2017, 01:39 PM
weldtoride weldtoride is offline
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Not exactly bicycle fenders, but similar. I am trying out different shapes to re-contour the tailight area on my '53 Buick. I am going for a shape somewhat more like a '51 Mercury, at least that's what in my head.

I have 2" wide anvils for my wheel. To begin, I stretched the middle of these 2 1/2" strips of .035" steel, and then used a Lancaster shrinker to bring the edges down and in. Also used some mild mallet and bag stretching, and some hammer/post dolly finessing and dressing.




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Old 03-13-2017, 11:25 AM
sandmanred sandmanred is offline
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Wow, so many ideas. Too many to MQ. Thanks to all that responded. I'm always amazed at all the possible ways to achieve a final form. I need to digest all the suggestions. I'll keep you posted on what I try.
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