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dbinokc
Joined: 05 May 2008
Posts: 5
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 Posted: Fri May 09, 2008 8:31 pm Post subject: Tuck shrinking |
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I just got the Scratch Building Basics video in today and finished watching it. Great video. Even if I do not decide to scratch build, I learned a lot of good sheet metal working techniques.
One question I had is when the leading edge of the rudder spar was being formed, it looked like the metal was being beaten back towards the top to get the smooth shape.
I recall seeing a technique called tuck shrinking where a flute was created and then beaten back down to force the metal back into itself and thus shorting the length. Could that technique be used to get the leading edge into shape or would there be a problem with the metal getting fatigued.
I also have the the Metalworking 101 video and will watch it tomorrow.
Damon
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kmccune
Joined: 22 Sep 2007
Posts: 577
Location: Wisconsin, USA
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| Posted: Sat May 10, 2008 3:40 am Post subject: Re: Tuck shrinking |
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I think it would fatigue the metal like you said. I has thrown out a few parts that I feel were about to fatigue. Mostly in the transition between the 16mm lip down to the 3mm lip in the nose area. It took me a bit to get the flutes in the form block correct, to keep the material in this area from "bunching up" you then try to save it and it cracks. This happens to Matt in the scratch building video, he resists the urge to keep trying and removes it from the form block and tweaks it with fluting pliers. This trick saved me some parts while I was getting the form block flutes correct.
PS I'm sure the kit is more exciting to build, but scratch build is extremely rewarding and fun.
Kevin
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