I’ve seen frequent references to JVN’s design calculator (http://www.chiefdelphi.com/media/papers/2755) in people figuring out what gearing to use on their designs. I’ve also seen references to “other” calculators, but I didn’t immediately see links and thus was unable to find them when I went back at a later time.
So, my question then … what useful calculators/spreadsheets do you have links to? Perhaps we can post them here and create a nice resource. I’ll update this main post as more links are posted, if any.