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Great question. stacking them would work the same as stacking any other type of gear. if the inner rotor is attached to the outer roter of the adjacent gear then the gear ratio would be a product of the two gear ratios. if you stacked two 4:1 gears then the over all ratio would be 16:1. while their is no friction between the gears when you start to spin the rotors quickly the ferromagnetic coupler generate significant eddy currents within it due to the rapidly alternating magnetic field. This in turn generates waste heated and reduces the max torque of the gear. one very effective way to reduce this effect is to make the ferromagnetic coupling layer out of many electrically isolated sheets, also called laminates, and for this reason is how transformers and many electric motors are constructed.

Thanks!

thanks :-)

he answer is cost. Sure you can get a cheap one at like what $20ish? but the price of the plastic to print it is probably like a few dollars. Plus, it's a project and he's also been able to make a video out of it too

To be honest I just thought it would be a fun little project to do and gave me an excuse to design and print some interesting parts and build something mechanical😀

You are absolutely right,. I think a lot of the jitteriness is coming from the lateral torque that the crank is causing as I rotate it. adding a motor is certainly one way of solving this, also I think changing the grip to include something that is braced against the forearm rather than pure grip strength might help too.

That sounds like a really interesting project. You will need a lot of magnets to get the precision your looking for. What sort of scale are you looking to build it to?

Great idea! I agree that would certainly save some time. I actually added the two holes at the back of the baseplate to mount a motor. Might need to add something grippy to the central wire guideway like a rubber band to stop it slipping against the wire first. The tool is actually pretty versatile, I've been able to use it to bend metal sheets as well to build magnetic gears in my latest video.

Thank you so much! Glad you enjoyed it!

Hi Markos, many thanks for the feedback. Would be keen to hear who is making composite bearings at scale and what applications they are being used in. Big bearings that have a significant weight premium is the requirement that comes to the forefront of my mind first, but keen to hear if their are others! As far as lubrication goes, I think the most correct answer (and most boring) is yes, lubrication is almost always a good idea, however which one to choose depends on factors like which base plastic is used, how fast you need it to run and where you're going to use it. But the more helpful answer for anyone making the type of composite bearing shown in the video is to try a silicone grease with not to many additives first.

That's a great idea! good luck!😃

Congrats on being the first one to comment. I really appreciate the positive words of encouragement. Sounds like an interesting extension to basically create a hardened surface in a 3d printed cylinder. I actually think another extension of this would be to use 3d printing to create a mold of the bearing and use forged carbon fiber to create the bearing housing with a hardened steel wire raceway embedded in it. just have to ensure that you also do something to mitigate the risk of galvanic corrosion. I think this might be another candidate for a future video :-). i'm actually in the process of setting up a website to make my designs available though. Will publicise this and add the links to the videos once it's live.