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| Sheetmetal shaping secrets Learn all the sheetmetal secrets here. |
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#1
02-01-2011, 11:28 AM
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motorcycle fender shaping
Here's some pix of a fixture I just made for my power hammer used for making fenders. I've had this idea rolling around in my head for a while and I haven't seen another like it. But I can't think that I am the first to come up with it.
It has a center section that shapes the contour of the fender and then two outer supports for shoes to force the radius into shape. The outer supports are adjusted by pushing on the body of the hammer. For my first test I made the shoes out of recycled plastic decking. For the next ones I will use either aluminum or High Density Polymer. This is the first full length fender I did in it. It takes a lot more force than I would have thought, but it works well. This is the first test piece I did. The wire in the wire edge started out the exact length as the fender blank. You can see that it now sticks out over 3/4 inch , which means that the folded edge of the fender shrunk 3/4 inch over it's length. The other interesting thing is that depth of the fender increases dramatically. So the measurement around the outside of the original fender that I was trying to reproduce is about 5 7/8 inches. My blank needs to be only 5 5/16 inches plus the wire edge allowance. That is a LOT of shrinking and stretching going on all at once and requires a lot strength in the machine and the fixture. There are more pix in this album.... http://metalmeet.com/forum/album.php?albumid=293
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Bill Two things I've learned... 1) The Amateur gets excited when things go right, The Professional gets excited when things go wrong! 2) There comes a point when you realize that you aren't going to do anything productive for the rest of the day....... http://mysite.verizon.net/billsmetal/ Last edited by Bill Gibson; 02-01-2011 at 12:00 PM. 
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#2
02-01-2011, 11:46 AM
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Looks Good Bill. What is the stroke on your machine set to?
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#3
02-01-2011, 11:55 AM
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about 3/32".
I built it out of an old riveter, and the stroke is adjustable from a few thousandths to 7/8". It is accomplished by moving the motor and ram back and forth, which changes the angle at which the ram contacts the ramp that pushes the head up and down. There's no guage to tell me what it's setting is. Its more of a feel for what the part needs. It took about 6 passes to get the contour of the fender without any roll/radius, and another 8 passes to get the final shape/radius.
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Bill Two things I've learned... 1) The Amateur gets excited when things go right, The Professional gets excited when things go wrong! 2) There comes a point when you realize that you aren't going to do anything productive for the rest of the day....... http://mysite.verizon.net/billsmetal/
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#4
02-01-2011, 12:05 PM
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Bill
 I think you just made it possible for me to build new bumpers for Porsche 356  Thanks for sharing
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Anders DK Metalshaping = Insight, planning, determination and PATIENCE!!
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#5
02-01-2011, 01:10 PM
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Great job Bill I just gotta make a visit soon and see it for myself.....
Kirk
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#6
02-01-2011, 01:47 PM
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Wonderful Bill!
Im glad to see it working. That is the same way i do the guards that I cant roll in my trumph nibbler. regards Dave
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