Monday, January 30, 2012


Today I put together the blueprints for the new design.  I use Rattlecad, an awesome free open source program that does a lot of the calculations for you.  You give it important information, like the slope of the seat tube and the drop of the bottom bracket, and it calculates the less exciting stuff.

I started with the geometry of a bike that I knew I liked, then lengthened the head tube about 4mm, bringing the imaginary bars up and back a little.  I entered the sloping top tube (6 degrees to match the lugs), and the offsets for where the tubes enter the lugs (how far one tube extends beyond the intersection with another).  I also tweaked the water bottle locations.

I'll print this full scale so that I can line the tubes up against it.  It'll let me quickly double check pieces and dimensions without TOO much measuring.

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