#21
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Quote:
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Dave |
#22
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Never seen one before. I've just read about it on a couple of forums.
From what I remember reading: The key is to put crown into a panel evenly as the first part. Maybe an inch high. The crown should be the same both ways with the four corners touching the table. Then, wheel the sheet perfectly flat again. |
#23
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The shrinks you made only pulled at the edge of the panel, and did not shrink farther into the panel. Stump or tuck shrinking would go deeper into the panel. Looking at the top photo in this post the shrinks need go in to the left end of the orange horizontal lines. A small amount of shrink at the orange lines. More shrink as you move out to the edge. Think of it like a slice of 🥧, one shrink at the inner point, and two shrinks out one inch, three shrinks out two inches, four shrinks out at the crust. You need to make some radius gauges to help see the flow and arrangement. Get your Wheaton’s box a ✏️ and scissors, to cut a number of these to match your fender. 3or 4 of them from the fender mount area towards the wheel opening and a couple the long way of the fender. If the fender from the other side of the vehicle is in better condition make them off of it. Label them and mark their position on the fender and your new panel. By using these you can see where your low spots are (outside surface), those areas that need to be stretched. You are making progress keep trying and watch closely what is changing. Only do a small amount of shrink and or stretch and recheck to see what has changed. Steve
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Steve Hamilton Hamilton Classics Auto Restoration & Metalshaping |
#24
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That exercise for flattening a curved piece was on a John Glover video
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Steve ærugo nunquam dormit |
#25
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I can positively confirm this as i purchase the book and did not find this lesson in there. An easy read though...
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Instagram @RealRiotRacing |
#26
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Simple question
First picture shows a radius gauge on the actual part i am trying to replicate. It measures about 5.0in radius.
So if i use my 4.5in Radius anvil and i just keep rolling in the same direction on this test sheet, won't the sides of the metal come down and eventually match the lower anvil? Meaning, if i use a 4.5radius anvil can i eventually form a 4.5in radius on this test panel? 20200912_192218971_iOS.jpg 20200912_191821266_iOS.jpg
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Instagram @RealRiotRacing Last edited by Steve Hamilton; 09-12-2020 at 10:16 PM. |
#27
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Yes, due to "springback" in the metal, the panel will lay down going through the compressive pass and immediately spring back up to a lesser radius. Harder metals have more spring-back. I have seen some panels (work hardened 2024 T3) with a radius of 24 inches being shaped with a lower roll having a 30in radius. ... and with metal that hard there were zero marks ... on our polished thin aircraft top skin.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. Last edited by crystallographic; 09-13-2020 at 07:45 AM. |
#28
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Removing shape exercise is in John Glover's book as well....
This is the second half of John Glover's exercise I referenced in post #11: removing shape. Below is a scan of page 30 from John Glover's self-published book, hope I am not violating any copyright rules.
SO much more to be gleaned from this book other than this simple exercise. His stories are also quite engaging and worth a read. Once again, I wholeheartedly recommend this book to anyone interested in learning the wheel...
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Mark from Illinois |
#29
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I've been back and forth between other projects. Here is where i am at. I'm really struggling to get the final shape dialed in. See the pictures below.
The last image is what my plan of attack would be. Stretch that tight radius area to pull the material up and away from the fender hoping that will pull the flat portion of material (what would be the outer side of the fender) against the current fender. See the arrows in orange what i THINK needs to happen. Please let me know if I am wrong. IMG_4031.jpg IMG_4032.JPG IMG_4033.jpg IMG_4036.jpg
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Instagram @RealRiotRacing Last edited by Steve Hamilton; 05-28-2021 at 12:51 PM. |
#30
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To me I would stretch the very edge at the top above the red lines you drew only. I think you have shrunk it too much there and releasing some of that you could then pull it over more even just bending it over your knee then.
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Marcus aka. Gojeep Victoria, Australia http://willyshotrod.com Invention is a combination of brains and materials. The more brains you use, the less materials you need. |
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