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hello everybody ... I want to know how this guitar side bending work ? what principles did this machine use? thank you, sorry for my poor english...

http://ultimate-guitar-online.ultimate-online-services.com/zencart/index.php?main_page=product_info&cPath=27&products_id=206&zenid=9342c86f6f17cddb16ffd077a6c69fea

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There is a video on youtube showing how Taylor guitars bend sides in their factory. that might be a good place to understand the bending process.

Bob

All benders work the same way....Heat up the wood to around 220 - 230 degrees F and it becomes bendable. Then let it cool in the bent shape and it will stay bent. This machine uses a heating blanket to heat the wood and a form to shape it.
I just use a hot pipe and bend by hand. Then let it cool in the mold. Hot pipes require almost no set up time and you can do any shape you like. Great for a hobby builder who makes a few different guitars per year.
Bending machines offer better heat control and are more repeatable.....but require a lot of time to make the bending form and setup. Great for a builder who makes many copies if the same shape