Hi,
The rubber tube coupling from the motor looks interesting. could you tell me what sort of tube this is and how rigid it is.
if solid rubber, it can be used to couple shafts with dissimilar sizes.
is there any flexion due to torsion, it might be an issue if there is no position feedback after the gear stages.
i've uploaded a video showing my controller. link is at this thread
http://www.iceinspace.com.au/forum/s...603#post602603
comments welcome.