White Paper Discuss: 2 speed, Shift-on-the-fly TechnoKat Gearbox

[Andy Baker]

Originally posted by Matthew_H
The ubergeeks are currently fabricating the parts to try and practice with this gearbox design. The biggest question that our team has at the moment is what do you have the shift shaft connecting to with the thread at M3x0.7
We do not have the this dye nor does the other machine shop that is helping. Is there a specific reason for using this thread.

Great design and my students are very excited about seeing this gearbox work.

Matthew
Team 1028
Ubergeeks

This part of the design is shown in the picture on the front of the white paper, but it is not detailed in the prints. The only reason I specified an M3 thread was to keep with our common fastener practice of M3 or M5 metric threads. However, like your team, we did not have a M3 die. So, we used a #6-32 die.

We put a small bearing (1/8" id) and a #6-32 lock nut to couple to that shifter shaft. The lock nut wanted to back off after many cycles, so we drilled through the nut and threaded stainless steel "speed wire" to hold the lock nut in place.

Good luck,
Andy