I’m using the RB-Sbo-110 planetary gear motors in my project, but have not been able to securely connect the output shaft.
This tiny .6mm round nylon shaft just slips too easily. Has anybody dealt with this problem? I want to use most of the torque that this motor has to offer.
To date, I’ve forced the shaft into a hole drilled with a .45mm drill bit in a UV-cure resin adapter disk - and have been able to get a little grip on the output shaft, but not enough.
Just to make sure, is there a heat shrink on your motor that is covering the nylon shaft?
The heat shrink holds the gearbox to the motor. It does not cover the shaft.
To date, I’ve tried putting some tooth on the shaft with a gentle sanding, and used superglue. It had almost no adhesion.
I’ve also tried creating slots in my adapter disks that have a key forced into place. The first one was too loose, and the second one sheared off the shaft. I suspect that this might be a good way to go, but at best, it’s going to take some very expensive experimentation, as these motors are $11 each. To give you an idea of the size of component I’m working with, my adapter plugs are 3mm thick, 3.8mm in diameter, and the key, which runs the length of the adapter, is 1.8mm in width, and is slightly tapered in height. I’m making these parts (scaled up and down for fit) on a resin printer, but they’re so darn small that they’re giving me fits.
I’ve also discovered a 9t spur gear that is intended for a 0.6mm shaft, but it’s apparently designed for the metallic output shaft of the ungeared version of the motor. I could fabricate an adapter to turn that gear into what I need, but I don’t think it’s going to do anything that my home-brew adapters don’t already do, and they’re out of stock anyway.
Lastly, I’ve ordered some glue that is supposed to have the ability to stick to nylon, but I’m concerned that it might eat completely through the shaft.
Just for the record, I’ve successfully attached the output shaft to the adapter using Surehold “Plastic Surgery” glue.
Thanks for the update, I’m sure this will help others here.
