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Bill, Thanks a lot for your detailed explanation, it cleared a lot misconceptions that I had for some reason and I've already saved it for future reference. I think it's time for a brush up on electrical engineering 101.

Brian, thanks for the suggestion, in my case I'm working with a stand alone system that will not be connected to the grid. Skogrussa, thank you, the exactly the kind of answer I was looking for. I think your suggestion is probably the most straightforward way to go about this. Hopefully it...

Brian, yes exactly, I see now the source of the earlier confusion, I should have probably explained differently.

crshers, just to clarify, the copper coloured box is the prime mover which rotating freely. Assume it's a turbine driven by water or air where I cannot essentially control the speed of that rotation. Now if I simply connect a shaft only to the copper box and nothing else at all it will rotate...

thanks again skogsgurra for looking into this problem. Admittedly not the best sketch but it roughly shows what I'm working with. so you see I have rotating device, similar to cylinder, which the shaft is connected to, then the shaft itself is coupled to a DC motor. so again the issue is...

Many thanks for everyone that took the time to reply to my question. I believe cswilson has explained in a better way than I could, I essentially have no control over the speed of rotating shaft and what I wanted to know is if there's anyway a DC motor (which I am planning to use as a...

Thanks to everyone who replied and apologies for the vague question. Essentially I have device that rotates which is driving the shaft. The shaft is coupled to a brushless DC motor in order to generate electricity from the rotation of the device. What I would like to do is to test this...

Hello everyone, I am intending on buying a brushless DC motor and use it as a generator to get the electrical output from a 7mm rotating shaft by coupling it with the motor. I need to somehow test the power output at different rotational speeds of the shaft. Is there anyway or kind of brushless...

Brain many thanks for both of your responses. I'll definitely have a look slip ring assembly to see if there's anything suitable. The dynamometer idea is quite interesting but I'm not certain if I can pull it off because the shaft has to be vertical. Buggar, It's a small rotating mechanism...

Cheers everyone for the replies and ideas. Do you recon there are any torque sensors that can be used be used given my parameters? or is my system too small? I have a reasonable budget of up to $800 if I can find a suitable torque sensor but for the life of me nothing in the market seems suitable.

Hello All, Is anyone aware of any torque measuring products or brands that are suitable to measure torque for a rotating 5mm shaft with only 100rpm and >30 N.m torque? I've been looking for a while but everything seems either prohibitively expensive (<$1000) or not suitable for my purpose...

cheers everyone I think I got it now.

Cheers for the response Mike, flanged bearing was my second thought and might just work. I imagine my second post with the images fit your suggestion. Thanks a lot for your suggestion Buggar! Stick, thanks a lot for sharing Mathias' channel, he has quite a large following I see!. I like your...

Cheers Jon! I will give that a go. A bit out of topic but would have any guesses of what would be the cheapest way to measure the rotating torque of the 5mm shaft? It's relatively slow at 100 rpm and torque of less than 20 N.m. Thanks again.

Alternatively I am thinking of using a miniature ball bearing with 5mm I.D and 10mm O.D and couple that with a 10mm I.D flanged bearing, I am not sure if that is going to work however?

Hello, I would appreciate if anyone can let me know what is the easiest way to bolt a bearing with 5mm ID and 16mm O.D onto a piece of wood so that it stays in place while allowing a 5mm shaft to rotate. I have attached a photo of the component if that helps. Would putting the bearing inside a...

Cheers byrdj, I've never used a thrust bearing before but I'll give it a shot. Many thanks Ted, I hadn't considered the damage to the shaft. Do you recon if I add the clamp collar held in place by the support I could increase the torque of the rotating shaft as it's rotational velocity drops...

cheers mighoser, I'll definitely add that as well.

Cheers Greg!

If you don't mind me asking, do you think a two piece shaft collar can be used as a break if I wish to slow down the speed of the shaft given that both the halves of the shaft collar are supported as shown below (rough digram). Again it's only 100rpm or so Thanks again!