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AlexAndChristine > The bottom bracket post diassembled. The key things here are getting the top and bottom of the mounting block to be flat and perfectly parallel. The adjustable shaft collar came from McMaster Carr and made the whole design possible and easy.
AlexAndChristine > The cone is secured in place with a center bolt. This one is sized for a 25mm to 30mm seat tube.
AlexAndChristine > This is what the inside of the linear bearing looks like. It slides on UHMW. The brake is just a knob with a 1/4-20 stud and an 8020 nut.
AlexAndChristine > The assembled bottom bracket post. It is important to make sure that the post is exactly perpendicular to the supporting block. This is done by locking the bottom shaft collar and the top of the adjustable shaft collar. Expand the adjustable shaft collar to lock the bottom against the supporting block. Tighten the bottom of the adjustable shaft collar. Since the supporting block is machined flat the tube will be perfectly perpendicular. Once this is done the top of the adjustable shaft collar can be opened and used for height adjustment. The cones are from my previous fixture and have a shallower angle than I'd use now. They work fine though.
AlexAndChristine > This is a better view of the tube holding tower. The linear bearing is a 8020 piece. I made the cone and the block which connects the cone to the linear bearing. No rocket science, but locating the cone precisely is important.
AlexAndChristine > A tube holding tower in place. Notice the brake handle to lock it into place.
AlexAndChristine > Current jig progress. Front triangle is mostly done. The main components are: * A center spine made out of 2040 extrusion (2" by 4") * Two diagonal supports, one for the HT and one for the seat tube. Those are 1010 extrusion (1" x 1") * Connecting blocks to connect the diagonal supports to the main spine * Tube holders on the diagonal supports.
AlexAndChristine > Loosen the middle bolt and you can move the headtube assembly forwards or backwards (changing the front center). Loosen the top and bottom bolts and you can move it up and down. Loosen all three and you can change the angle.
AlexAndChristine > Cargo tube/seat tube junction. I added a gusset to spread the load and because my cargo tube was 1mm short and I didn't want to remiter the top tube.
The bottom bracket post diassembled. The key things here are getting the top and bottom of the mounting block to be flat and perfectly parallel. The adjustable shaft collar came from McMaster Carr and made the whole design possible and easy.
AlexAndChristine > The bottom bracket post diassembled. The key things here are getting the top and bottom of the mounting block to be flat and perfectly parallel. The adjustable shaft collar came from McMaster Carr and made the whole design possible and easy.
The bottom bracket post diassembled. The key things here are getting the top and bottom of the mounting block to be flat and perfectly parallel. The adjustable shaft collar came from McMaster Carr and made the whole design possible and easy.
See photo in gallery
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