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Jaroslav |
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Thanks Peter T. for adding so much more info. Happy New Year.
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David Hamer |
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Thanks Marcus and Peter, good info.
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Steve ærugo nunquam dormit |
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For beginners out there that do not understand how a reverse curve works Simply watch the video where Mohamed is using the olive machine and see how he changes the position of the panel tighten the rollers and pulls down at the right time on to the machine. This method can be used when the reverse is done either by wheeling. Or hammering with or without machines So this is what he is doing............... 1st First he puts the panel in the middle of the top roller and with some pressure he brakes the grain. .................................................. .................................................. .... NOW this is the same action when using a wheeling machine .................................................. .................................................. ... 1st put the panel through the wheeling machine and brake the grain with little pressure. /////////////////////////////////////////////////////////////////////////////////// 2nd after a couple of runs he increased the pressure on the roller and moves the panel a little off the center of the top roller .................................................. .................................................. ....... NOW this is the same action when using a wheeling machine .................................................. .................................................. ... 2nd start stretching one of the edges by wheeling backwards and make the edge wavy (back the pressure OFF when working towards the center //////////////////////////////////////////////////////////////////////////////////// 3rd He keeps changing the position of the panel on to the roller in order to stretch the two edges as he want's them .................................................. .................................................. ........ NOW this is the same action using a wheeling machine .................................................. .................................................. ..... 3rd stretch the other edge as necessary make the edge wavy BUT again keep the pressure off when working towards the center /////////////////////////////////////////////////////////////////////////////////// 4th He is now starting to pull down on the panel while the panel is exiting the machine ,and .. NOTE THAT THE EDGE IS GETTING TIGHT .................................................. .................................................. .. NOW this is the same action using a wheeling machine .................................................. .................................................. ... 4th We have now two stretched edges, so back the pressure off till the top wheel and lower anvil are JUST TOUCHING with the panel backwards on to the wheel PULL the panel UPWARDS TOWARDS THE TOP WHEEL starting from the center and working towards the two stretched edges till the edges are tight again /////////////////////////////////////////////////////////////////////////////////// You can clearly see this action that Mohamed is using on the rollers when he tightens the machine, and when He moves the panel where He want's it .................................................. .................................................. ...... On the wheel the same action is used, meaning keep stretching the edge till wavy, .... back the pressure off,..... panel backwards on wheel,.... work your way to the edges,.Till the shape wanted is achieved Peter Ohhh..I forgot one important thing when stretching the edges use a reasonable flat anvil (not too flat ''check shape of the return'') then when working from the middle towards the edges use a lightly rounder anvil, this is because you do not want create lines on the return.
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P.Tommasini Metalshaping tools and dvds www.handbuilt.net.au Metalshaping clip on youtube http://www.youtube.com/watch?v=WEAh91hodPg Making Monaro Quarter panel: http://www.youtube.com/watch?v=KIpOhz0uGRM Last edited by Peter Tommasini; 01-03-2019 at 09:37 PM. |
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Hi Peter, Thanks for the information, it is always great to get a detailed description on how the work is performed. I'm gas welding aluminum now with excellent results. Most of my parts are smaller in size, 2' x 3' (600mm x 900mm) so it is easier to manipulate the panels. So far, the process I like the most is to tack in several spots at one end of the seam. I adjust the panel, planish as needed and them weld the same area about 1/2" (12mm) long. I can then move the panel up and down, in and out as needed and fuse tack along the seam until it is tacked from one end to the other. Planish and adjust as I need, then one weld full length from one side to the other with filler rod. Light planish/wheeling as needed and body file off the balance of the weld. Due to Federal aviation regulations, I'm required to leave a visual portion (weld bead) of the weld seam. I metal finish the out side of the panel smooth to the surface and leave the weld bead on the inside of the panel. If I get undercutting or a small low spot next to the weld, I will push up what I can, with out using a pick hammer, (I don't like pick marks on the back side of my panel). If I have small lows, 1/8" 3mm or smaller, I use an aluminum solder to ill them in and metal finish the surface. Makes for a clean appearance for the customer who can be Fuss Pots over little detail items. I still have more to learn, but getting better every day. Thanks Bill
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Bill Tromblay "A sign of a good machinist, is one who can fix his F$@& Ups" My mentor and friend, Gil Zietz Micro Metric Machine. |
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Peter Peter
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P.Tommasini Metalshaping tools and dvds www.handbuilt.net.au Metalshaping clip on youtube http://www.youtube.com/watch?v=WEAh91hodPg Making Monaro Quarter panel: http://www.youtube.com/watch?v=KIpOhz0uGRM |
#17
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I'm glad your torch is now working for you, Bill. A little bit of maintenance on it was all that was needed. Good to see you are practicing your welding.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
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My learning curve was a little long, but the quality of my welds are good now. My work, looks as good as the factory welds and I'm a happy guy. I still practice often, but like any new skill, it takes time to perfect. Thanks for your help, I still would like to take your class. I found your class schedule on your website, will keep an eye on it for the 2019 season. Bill
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Bill Tromblay "A sign of a good machinist, is one who can fix his F$@& Ups" My mentor and friend, Gil Zietz Micro Metric Machine. |
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Bill, can you talk a bit more about the solder fill process?
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Kerry Pinkerton |
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This is a new cowl piece that I'm making for a WW2 Taylercraft L-2M. 1.jpg In this photo, you can see the two weld bead directions. The discolored area is where I used Aluminum solder as a body filler. 2.jpg The solder works well if I have an undercut from a weld or a surface imperfection. I had a 1946 Fairchild 24 nose bowl, that was damaged by the customer. In areas with deep scratches, I would metal finish the best I could, then solder up the scratch. I would then metal finish the solder to the original surface. This product is available from Kent White at TM Technologies. http://www.tinmantech.com/products/b...x-core-rod.php Here is a Youtube video, with Kent showing the application. https://www.youtube.com/watch?v=RRWmpSE-hXk Hope it helps. Bill
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Bill Tromblay "A sign of a good machinist, is one who can fix his F$@& Ups" My mentor and friend, Gil Zietz Micro Metric Machine. |
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