Shortly after the ER16/11 Collet-Chucks for PicoCNC spindle arrived, the brushless outrunner motors for this project followed suit. After closer inspection, both motors appear to be as equal as their datasheets suggested so the first prototype will be assembled with the brandless 50EUR C5045 890KV brushless outrunner (the red/black one on the right).
In order to progress picoCNC - A modular fabrication robot we have to replace the original shaft with the new collet. But how do you take it apart without special tools? The following 7-step HOWTO will guide you through the simple dis-assembly process:
There seem to be several ways to separate the parts of brushless motors:
In this case, no special tools were available, neither was a bench vise. The hot-air gun method was postponed (and not necessary after all) due to the fact, that neodymium magnets demagnetize at a certain temperature. The magnets used in these brushless outrunners should be able to withstand a temperature of 100°C, since this temperature might occur in normal operation but, you never know.
However, for this HOWTO, you will only need a hammer. And some hacker creativitiy.
Never underestimate the force of these magnets. At this point and again, when you re-assemble the motor, the bell might easily snap back into its original position by itself if you let it slide too far up again. So please, take special care when executing the next step, because it will hurt, if a part of your skin is getting wedged in between the bell and the base, when they slam home.
Well, who knew, that chopsticks can be used to dis-assemble a brushless outrunnner motor? And please, be so kind and let others know how and if it worked for you. Leave a comment, share your experience.
I would have loved to make a video for this HOWTO since it makes things much more easy to grasp and leaves less room for interpretation. However, shooting and editing takes considerably more time and resources, which I don't have at the moment, due to my full-time job. I really would like to get back to the state where Apollo-NG is my full-time job, but that can only happen if the Odyssey and Aquarius are finally on the road, fulfilling their mission. If you'd like to see more content and videos, please consider helping the cause.