I am slowly learning some 3D parametric solid modelling with AutoDesk Inventor. As a first project, I have modeled the brake pivot jig I described a while back.
These drawings are pretty close to what I drew in that earlier post, although not all of the parts exist yet. A computer model conveys the concept better than the existing parts could.
These drawings are missing the brake pivots themselves, as well as all the metric set screws, clamping bolts, washers, etc.
Also conspicuously missing is the fork, which would provide context. Here's the best I can do. This is the jig that inspired this new design:
Now the model of the new jig...
Isometric view from dropout end. This is common fork jig positioning (e.g. Anvil, Bringheli).
Similar view, but flipped over--this would be showing the fork's back/underside.
Isometric view of Dummy Axle, Dummy Axle Holder Block, and Backbone Bar.
The dummy axle design is inspired directly by Anvil. The mating Block should be compatible, should I decide to upgrade.
Isometric view of Pivot Holder Block, Pivot Holder, and Backbone Bar.
Lower set screw hole is mirrored on the far side, as can be seen in other views.
These two set screws (only one is necessary at a time) hold the Pivot Holder at the proper 90° angle. I also hope the threaded holes can be used to hold chainstay and seatstay bridges in position for brazing, using a pre-brazed fender mounting boss.
Assembly side view. Distance between blocks is infinitely adjustable.
Looking down through the fork's steerer tube. This would be what the rider would see if a whole host of unlikely things happened (jig in place of front wheel, transparent frameset).
Weird pseudo-end view, looking up the fork from the dropout/bottom end.
So, what do you think?