In case it is useful to anyone, I thought I would share a file that I have put together that has been valuable to me while I have been making robot designs. This is a combination of a few of the design tools that can be found on the Ask Aaron tools page, as well as a couple of my own. There are tabs in the spreadsheet that give you offline versions of the drivetrain calculator, rotary spin up tool, and the gyroscopic force calculator. There is also a page for calculations for non-toothed belts, and a bill of materials to total up all of the parts that would go into a design. While most of this already existed elsewhere, I find it useful to have it all consolidated into one place and saved offline for later reference.