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Old 01-23-2011, 08:37 PM
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2door 2door is offline
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Join Date: Sep 2008
Location: Littleton, Colorado
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Default Re: Tinsmith's in frame gas tank for cantilever Schwinn.

The wood block and mallet method is called 'hammer forming' and can be mastered with some practice. The harder the wood, the better the finished product. The trick is to calculate what is called, set back and bend allowence. The radius of the bend determines how much material you have to work with and how much you have left to work with after forming. This is an old technique that has been used to form metal into complex shapes for a long time. Compound curves can be acheieved with a sand bag and a soft mallet. The old timers used a leather bag filled with lead shot. The challenge here is to make identical left and right halves of a project. That's where the talent and artistry comes in.
Your friend, Dan, looks like he has both. Thanks for sharing, Silver.
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