#11
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mastery, oiling
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edit: I believe mastery of an art to be at that level of practice which has fewer limits, and many more possibilities. Re: oiling the panel Oiling the panel is a technique, especially with using steel in the power hammers, as it permits the panels to slide quickly. Two drawback to this on aluminum are: 1) oil retains any airborne grit onto the surface - and also hairs from eyebrows, eyelashes, mustaches etc (wearing hairnets is only a partial fix) often fall to the surface and can be compressed into it. On aircraft panels these compression marks are flaws, and in some cases where the hair sticks to the wheel and makes several repeated passes in the same area it makes a high spot - 2) aluminum is made nearly unweldable by compressing oil into its surface, by either wheel or hammer - ask those who learn this the hard way ..... . When using a planishing hammer or a power hammer on aluminum, the aluminum frets onto the dies (search: fretting corrosion), creates friction and makes it difficult to move the panel smoothly. Lubricant is needed, but not one that will impregnate the surface and add problems during welding - or add stress corrosion later on.
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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; 07-30-2016 at 11:01 AM. |
#12
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Thanks David
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David Geelong victoria Australia |
#13
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i was taught by wray and he doesn't wheel an one direction by any means.. all over the map, and his panels look like glass.
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Steve |
#14
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Just in case someone is so obtuse they don't understand the sarcasm, I'm being sarcastic. I learned from Wray Schelin too and use contact flat anvils. I'm not a true radius fan. That said, they can work and work well for folks that master them, I'm just not one of those who has. Folks, there are so many ways to shape metal it's hard to count. Anyone who says their way is the ONLY way is full of crap. Folks learn a way. With persistence and dedication, they may learn several ways. None of they are wrong. I choose to use what works best for ME. I've been able to teach that to a bunch of folks over the years but HOPEFULLY, the main thing I've taught them is that there are other ways and they should choose the approach that works for them. A few years ago, a friend, who shall remain nameless, was trying to make a thing and struggling with it. He asked several very knowledgeable shapers for guidance and received some good input. However, he was still struggling with the part. Eventually he asked me and I explained how I would approach it and then took the panel showed him how to do what I was talking about. The FLASH when the lightbulb went off was blinding and he finished the panel in short order. I'm not telling this story in order to make people think I'm a master shaper. I'm not and I'm not that good. And the advise that my friend was given was all correct and would have worked. But it didn't work for HIM. We have to choose an approach that works for US and what skills and tools we have available.
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Kerry Pinkerton |
#15
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From what I have gathered over the years from listening and looking at what the pro's do and my own experience, is wheeling shape in one or more than direction, depends on the level of crown you are trying to achieve.
I agree that wheeling a low crown door or roof skin would be easier to achieve in 1 direction, cross wheeling causes an uneven/rippled surface as the change in direction creates shape in a conflicting direction. A high crown panel is more forgiving to cross wheeling and is sometimes necessary due to the shape required. A random wheeling method by nature would be hard to get your head around, it would make everything really difficult, why do it the hard way.
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Cheers Martin No matter how clever you think you are, stupidity is always one step ahead!!!! Last edited by Maxakarudy; 07-31-2016 at 06:01 AM. |
#16
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Believe Kerry on that one. I may not be THE guy he is talking about, but I was A guy at Dans, that could not figure out a reverse curve on the speedster cowl panel. I was all morning trying to get one side done, and after Kerry's input, the other side got done in about an hour and a half. By the way, "Pinky", I am not obtuse.
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Will |
#17
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Quote:
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I don't like true radius anvils and don't especially care for soft frames. That doesn't mean I can't shape a nice looking panel. I was taught by Wray who uses STIFF frames, contact flats, works from FSPs, and shapes out of arrangement. That approach speaks to me. But it's not the only way. Yes Will, I was talking about your reverse at Dan's. I agree you're not obtuse...more oval But then I'm catching up rapidly.
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Kerry Pinkerton |
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