#21
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Thank you for sharing such great insights.
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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. |
#22
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Quote:
It raises another question re wane, maybe nominal issues. I understand some will both test new sheets of metal for both hardness and thickness so they can be more closely matched with other like metal in inventory. If done, sounds like measuring & matching needs to consider multiple sides based upon wane. Would wane also induce some work hardening?
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AC Button II http://CarolinaSculptureStudio.com https://www.youtube.com/channel/UCzSYaYdis55gE-vqifzjA6A Carolina Sculpture Studio Channel |
#23
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Cliff, The older senior aviation metal men have told me that when they receive a load of sheet and put the first into shape they are very watchful/critical of all of the possible anomalies - and when they get a really good batch of material they call the supplier right away and find out if they can double the load IF the available material is from the same run. Yes, using "same" material as factory when doing repairs can have significant time savings - so finding spares/scraps that match can help a lot. Otherwise, do your best with known measurements of alloy, temper and thickness. ( I'm thinking of Jaroslav here, with his "hard" and soft material being used for his trim pieces ...) Note: Listening to the ring of the metal can give a trained ear a clear indication of hardness, or lack of hardness. BIG difference between the "clack" or "thud" of soft and the "broinngg" of hard - and variations between. -end-
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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. |
#24
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ERCO power shrinker (HDAS4 by TM Tech)
In addition to using the Air Power Hammer for shrinking, the ERCO power shrinker was also used. Here we are "tuning up" an edge to fit more closely on a final fit. We are going in about 3 inches at the most, but are working the edge more than anything. Because it has a very fine adjustment on the hand wheel, shrinks are made accurately and repeatably, whether one at a time or in long sequences automatically. TM Tech also makes a variety of the ERCO jaws, so the degree of stipple can vary from barely visible to like driveway gravel. Shown here is the #2 stipple, for doing .050" and .063" aluminum.
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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. |
#25
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FLOW FORMING skins
The doors on the GT40 are complicated assemblies. (more on that later)
There are inner reinforcing doublers above the driver/passenger heads that are formed with enough detail to require forethought and planning. We decided to flow form our parts, and the test parts would be done over the f'glas door frames (some f'glas deterioration risk involved.) Using 4X rivet guns and a variety of shaping schnoobles, the annealed sheet went down into place with some application of the 7 P's (Proper Prior Planning Prevents Pxxx Poor Product). Hence: Blank is annealed in specific areas that will be shaped. Blank is clamped to form. 4X gun is employed with correctly-shaped urethane schnooble. Repeated passes lower the surrounding areas incrementally. Part is re-annealed when resistant to another forming pass. Schnoobles are changed periodically, as needed. (It's not difficult to mount up a blank insert in a flow-form tool, spin w/drill press, and sand the shape needed. For chisel shapes, mount tool in vise, mark areas and shave off w/sander - OR use bandsaw very carefully and then sand. (Note: our tools are hardened steel and our inserts are a variety of heat-resistant hardnesses from our various polymer suppliers....) Cooling the guns and tools in water. Long stretches of forming builds up heat, so we take a moment and cool the tools, periodically. (Oily compressed air dries the guns out rapidly.) I've been doing this since ... um ... 1981, and I've collected a fair bit of schnooble-ishus stuff. Oh - might as well add this. George and I have worked together for over 13 years now, so we have a lot of shared history and methodology - and other students too, as well ... A few years ago I laid out a few guns on the table, to give students some creative ideas ... - end -
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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; 11-08-2019 at 06:09 PM. |
#26
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^^Thanks for sharing that Kent!. A friend of mine is fond of saying, " I know what I know, and I dont know what I dont know".
I learn something from all your posts.
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Barry Duckworth |
#27
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George and Kent
What a neat project. I am sure that many including myself have dreamed about having a GT 40. George is one of few that have made that dream come true. The dedication required to stay with the project and not lose interest is honorable. Knowing your personal skill set and getting expert advise and or help is also commendable. The workmanship is top shelf! George you can be very proud of your accomplishments. Thanks Kent for the wonderful tutorial. Posts like these are invaluable to our members. Look forward to seeing more posts about this build. Steve
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Steve Hamilton Hamilton Classics Auto Restoration & Metalshaping |
#28
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Geez, what a great project, I am impressed with the work of you both. I miss our chats, my friend, I will be in touch.
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Will |
#29
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Hi Barry,
Thanks, and very glad you are enjoying the saga. Hi Steve, Yes it was a long slog, broken by doing other big projects, but still .... serious grit required. Glad to toss in the tutorial as it is one that I know pretty well, by now. Hi Will, It's been too long and too many projects. Missing those W.H. visits a LOT. Looking forward to a good chat.
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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. |
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