eLofty Kegel Spacer for Janux Hubs
This appears to be a success! While I have not run these spacers yet, I have mounted them and things look good.
Just a review
- 3/16 Aluminum plate
- Laser cut to specifications
- 65mm OD
- 39mm ID
- 5.15mm holes
- 6mm between OD and outside of bolt hole
- 6 holes equidistant
- Finished product ~24g each
- 16mm M5 black oxide socket head bolts (up from the stock 10mm)
Fit and finish
Here are the adapters. The top one is finished while the bottom adapter is as the parts arrived from the laser cutter (actually slightly polished).
You should be able to see the difference in the grain of the screw holes, the surface, and the ID.
Here is the spacer fitted to the motor (it’s a nice tight fit after some time with fine grit sandpaper):
This shot shows both the adapter after having been lightly bolted down and (more importantly) shows the now flush fit of the axle step down:
Finally, we put the hub onto the adapter and viola!- a nice close fit between the adapter and the hub. The spacer therefore allows for use of both 608 bearings in the Janux hubs.
Points to consider
While my dimensions for the spacer were correct, I did not take the kerf of the cutting laser into account (which is slightly angled). As such, the dimensions of the cuts on one side of the spacer are ever so slightly wider than the other side of the part. This resulted in a fit which was slightly too tight on one side of the spacer. After some quality time with files and sandpaper, the spacer provided a nice tight fit to both the motor fitment ring and the adapter bolts.
My concern above about the motor fitment ring is now moot. The bolt hole tolerances in the adapter are tight enough to self align with the bolt holes, which means the motor fitment ring is indeed vestigial.
I thought about anodizing the spacer but I rather like the color of the raw aluminum and how it contrasts with the adjacent parts.
I also thought about sanding the OD, but the ribbed pattern left by the laser is also pretty attractive to me.
Pending Question
My question above about Loctite was meant for the hub bolts and not really the adapter bolts. Nonetheless, based on feedback from @pkasanda - I’ll be adding additional lock washers to the adapter bolts. Any word on what to use for the hub bolts? With the hubs being made out of aluminum, I’m concerned that lock washers would damage the surface.