I always wanted to make a bicycle so first I made a fixture to hold the tubes and all the pieces and dropouts in place while tack welding the frame. Then I made several Bicycles,,,
 
You can walk up to this fully adjustable fixture and set the wheelbase, bottom bracket height, chainstay, angle and height of headtube, downtube, top tube, angle of seat tube, location of seat stays. Each piece of the frame has a holding fixture that is adjustable and truable and the holding fixtures swing out of the way after tacking and for frame removal. The rear drop out holding fixture is truable to the surface of the cast aluminum surface plate and the rear drop out fixture has a wheel template that swings through the tubes while in the fixture and shows where the rims, braking surface, and tire size actually is which is handy for locating brake bosses and this template serves as a way to check the frame for alignment to with in a couple thousands of an inch. The surface plate is indiced so that eas8y adjusting can be achieved without a tape measure so you can design in real time, i.e. re-set it and lock it down, the surface plate is the orientation for xyz from a zero position and is endiced on inches. Basically you can walk up to this fixture and set the major aspects of a given frame configuration in a few minutes. This fixture holds the bottom bracket and head tube in place so you can accurately cut the tubings for a watertight joint. All holding fixtures for all frame tubings have thumb screws for micro adjustment and locking bolts to secure in place for tack welding. It was fun to make this quite versatile and accurate bicycle frame making fixture and several bikes were made. After nearly twenty years I still ride the first bike I made from tange tubing. The frame weighs 3lbs 10 oz
 
Bicycles are great, I'm glad I learned how to make them.
 
This Bicycle Making Fixture is for Sale
 
Below is an example of my work /design / machine skills.
 
Thank you for any consideration
 
Bicycle Making Fixture
(Bicycle Jig)
--Surface plate accurate to within .005
--All fixture holders are truable checkable and repeatable for building and fitting of frame tubings.
--Fixture is easily adjustable to a range of sizes and styles of tubings and dropouts.
--Holds ALL the parts of a bicycle frame for accurate alignment during tacking.
--All frame tubing holding fixtures swing out of the way for fitting and removal form fixture after tacking.
--Design and manufacture of this tacking fixture by Paul McMillan. For making lightweight
bicycle frames.
--All supporting tubing holders and cutting fixtures made by Paul McMillan and are available for view.
--Transmission designs and 7 inch variable air sprung suspension systems are available for view
by request.
--Test rides of finished bikes available!
 
 
Surface Plate
endice of wheel diameter
&
Headtube Angle settings
Down Tube
&
Bottom bracket
View
Seat tube
&
Seat stay
View
 
Seat tube
&
Top tube
View
 
Bottom bracket
View
 
Bottom bracket
Chain Stay View
View
 
Head tube
View
   
 
Enjoy bicycling be safe, wear a helmet please,,
 
Paul McMillan
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