I am in the process of making a round Joiner, its is aluminum and its .018" thick with a 0.5" over lap for spotwelding. I am wondering what is the best way to design this, and how. I see and example where a cylinder was made and some how they unfolded it to a flatten state, "I have know Idea how it was done". Another example I see was with a spiral and again I have now idea how they did. Is there a book or web site out there that deals with the sheet metal aspect of solidworks. Thanks for the help, and I look forward to contributing to the forum