Sorry for the confusion.
Proof of concept is confirming that something will work based on information you care about and not worrying about aspects that wouldn't be in the final design. In this case I'm concerned with making an axle that can fit the forks and the wheel, how the axle is held together in testing doesn't matter.
This is just a mock up and the threads in the middle are just because my printer isn't big enough to print the whole axle length at once so I needed a way to connect the pieces. I also put round stock as the core so I can put some weight on it and roll it around without it breaking. The real one will be solid all the way through and work like a regular axle with a nut side and bolt side.
Here are the pieces being printed.
A big part of the reason for doing this is to be able to take accurate measurements for the rotor location, spacers, etc.
deviant said:
Not sure why you're going through all that effort to keep a 15mm axle. There's a reason they make them thicker now. 25mm is much stiffer and handles much better. Besides, for just short of $11 you have your wheel fitted. You should be replacing the wheel bearing anyway.
http://www.vxb.com/6205-Z-Double-Bore-Dia-25mm-OD-52mm-Width-15mm-p/6205-Z.htm?gclid=CjwKEAjwp-S6BRDj4Z7z2IWUhG8SJAAbqbF3wHtU5yK8xx8RJKkUCqLfm9iOjE6_QX_K5jg3LcSwNxoCjCjw_wcB
or here
http://www.shopsuperdaves.com/all-balls-all-balls-individual-wheel-bearing--seals-detail.htm?productid=8722851
Then, if you go to a CB750 hub, you can match the disc bolt pattern to an FZR and just run spacers with the same bolt pattern. They're already set up for dual disc, where the 360 is single disc.
Thanks for the info! I've been debating between keeping the 15mm axle or using the 25mm one.
I haven't been able to find the answer to the question of if I switched out the bearings for a 25mm axle in the stock hub, will I need to drill out the center of the hub to make room for the larger axle and center spacer? Or is the hub hollow enough that they will fit with just new bearings?
Some of my reasons for keeping the 15mm axle are that I will need to have spacers made anyway for the 25mm one, I still have to custom mount the rotor regardless of the wheel/axle choice, and I think it would be nice to keep the original speedometer sender and would be one less thing to have to figure out. I also like the look of the single rotor for this bike. For this build and my intended riding style, 2 rotors would probably be overkill. And for the same reason, I'm less concerned the axle stiffness will be the bottle neck in the riding performance. I'm going for more of a fun cruise around town bike than something to take to the track (I have the SV650 for the go fast fun).
At this point I don't think I want to re-lace the front wheel so I'd rather not swap hubs. But once I can ride it around and have an itch to do something else, I'll keep in mind to upgrade the front wheel and axle.