#1
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shaping mirror image pieces
I was watching a Lazze video online and he commented that he tells student to build both parts at the same time. So, when you run one part in the E-wheel, you then do the same to the other part. This helps with the symmetry. I have been working on a tank and finished one side comletely. Now I'm working on the second side, using templates taken from the first side.
I was woundering, what approach do others use when making symmetrical mirror image pieces?
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Mike B. - More tools don't make me better until I have the skills to use them. |
#2
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Often, I will do one part then another, or both at close the same time so my mind is tuned to the part. Other times, I shape one then get to the other side much later. Depends on timing, difficulty of the part, or maybe because I want to do a totally different approach I will do it later.
Personal preference, man. Marty
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Results = (Effort X Determination2) + Time |
#3
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I am putting this out there purely for everyone to ponder. Having made many many bowls and instructed probably thousands of novices at the Sun-n-Fun Flyin, I have had time to do some messing around with said objects. A couple of years ago, in a slow period, I decided to see if I could take a bowl back to a flat piece. I whacked it with a big flat faced mallet and discovered that the bowl wanted to be turned inside out. I proceeded to do that. This year, I took a bowl and turned it inside out and then back to the original bowl again. It started to work harden on the return trip but did return to very close to the original shape.
All that being said, I propose a test for those up to it. Shape an object two at a time. That is both pieces clamped or tacked together. Do your shaping and then separate the two pieces and then turn one inside out for your mirror image. Start your test by just turning a bowl inside out. Don't get carrried away with the mallet and you will be surprised by the results. We had an old (really old) gentleman in the tent quite a few years ago. He told me that the only way that they could make any money back then was to shape multiple pieces at one time on the power hammers. Before anyone says "it can't be done" give it a try. Next year at Sun-n-Fun I am considering seeing how many times that I can turn a bowl inside out without it cracking. Just using a washover pass on the wheel or annealing with a torch. |
#4
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I have done as you suggest, inadverntly by starting on the wrong side.
I am not sure I would start out that way, but for some it may be easier. Marty
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Results = (Effort X Determination2) + Time |
#5
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I almost always make the parts for both sides at the same time or one after the other but the most important thing is to cut your blanks the same or from the same pattern at least. Like Marty I have formed up the wrong side and I have reversed the panel (or turned it inside out) on quite a few occasions.
David
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Metalshaping DVD. www.metalshapingzone.com Metalshaping with hand tools on youtube http://www.youtube.com/watch?v=IGElSHzm0q8 All things are possible. |
#6
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I make one side and then take a flex pattern and contour gauges and then use that as a guide for shaping and fitting for welding.
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Johnny Arial This forum is dedicated to Metal Shaping. Please stay on topic. |
#7
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Thanks for the input.That gives me something to think about. I took so long to do the 1st panel that it really wasn't too fresh in my mind how I initially shaped the panel. Now that I've started the 2nd panel it's coming back to me.
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Mike B. - More tools don't make me better until I have the skills to use them. |
#8
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Quote:
However, I'm not sure how well this would work on anything but a power hammer. Any experience using a wheel or mallets/bag with 2 pieces of 18 ga?
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http://www.shawnmarsh.com - My metalshaping portfolio as I get started in the world of metal. |
#9
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After I shape the first piece I draw lines in stratigic locations over the piece. Then I cut out 1" strips of the correct lenght and shrink the strips to the contors of the areas with the lines. Makes making identical pieces a breeze.
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Blake Tomlinson "Much good work is lost for the lack of a little more." -Edward H. Harriman |
#10
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Hammering 2 sheets of 18 ga would take some serious effort. I have hammered out 18ga on a sand bag using a heavy hammer(and a lot of sweat). I would think you could do it but you would want to use a hefty hammer. That might be a good application for low pressure press forming.
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Mike B. - More tools don't make me better until I have the skills to use them. |
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