Porter Cycles LLC

The Bicycle Frame Fixture: The alter of frame builders, the critical space to establish the geometry of the frame and to hold it's elements in place for joining.  Thousands of iterations exist, here's what I came up with. 

I am a DIY kinda guy, that's why I made my first frame fixture and my first bike.  I rode the hell of that bike and threw away the fixture immediately.  I'm also self taught as a metal worker.  The fixture you see here is the first major project I designed and built using a milling machine and lathe.  I learned an incredible number of lessons in the process.  Thankfully I left myself plenty of room to revise, and adapt the structure and its components as I learned better how I would want the system to function, and as I learned to be more precise in my methods.  I spent a long time looking at other models and versions pictured on the internet, especially Anvil (Master), Sputnik (ingenuity), and Bringhelli (simplicity), three of the most widely used makers I found.  I admittedly had no idea what I was doing or how exactly these fixtures all worked but I set out to create a hybrid amalgomation of what made sense to me at the time.  Since the first iteration, I have gone back and recut, faced, replaced, and modified most of my original work and created something I love to work with.  Having since acquired  an Anvil Journeyman 2, I have dedicated this fixture to brazing operations, and use the Anvil for Tig welded construction.  

The framing is cut from 3" x 1" solid 6061 Aluminum bar, with 1/2" Brass rails and angle plate, Steel cones and BB tower, and all Stainless Steel hardware.  The fixture's stand has a worm-drive mechanism recycled from a vintage Sibley Drill Press (the Smithsonian has one on display) that allows the fixture to be angled back parrallel to the ground and swivels 360 degrees for easy maneuvering while fitting and joining bicycle frame materials. 

Bicycle, frame fixture, fixture, jig, manual machining, bike, frame building Bicycle, frame fixture, fixture, jig, manual machining, bike, frame building Bicycle, frame fixture, fixture, jig, manual machining, bike, frame building Bicycle, frame fixture, fixture, jig, manual machining, bike, frame building