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[PStechPaul]

A PM motor is inherently more efficient because no energy is lost in field coils. But strong magnets are expensive and possibly fragile and may lose strength...

[PStechPaul]

Great video!. My comments:...

[PStechPaul]

I was unfamiliar with N-ratings for neodymium magnets. Here is helpful info:

https://www.apexmagnets.com/news-how...erences-n-rati...

[PStechPaul]

It looks like a sort of hammertone finish, which may be hard to duplicate. And it seems to be still in pretty good condition. So I wonder if it would...

[PStechPaul]

Looks like you will have a lot of material to remove. It will be interesting to see how you do it. I might have tried using a ring roller to bend some...

[PStechPaul]

Yes, I was going by theoretic calculations. 748 watts / ( 240 * sqrt(3) ) = 1.8 amps/phase. Here is a good chart of motor current ratings.

...

[PStechPaul]

1.9 amps per phase seems about right for a 1 HP 240 VAC motor running at rated load and 94% efficiency. But it is more likely to be about 80% efficient...

[PStechPaul]

There is some evidence that TENS and other forms of therapy (such as acupuncture and massage) can help neuropathy:

https://nervepainreme...

[PStechPaul]

Seems like an adjustable reamer might be good to clean up the roughness left by the boring tool. Having multiple long cutting edges ensures that it will...

[PStechPaul]

I used my TENS unit on my feet and ankles last night. I had to apply 25-30 mA to get a strong sensation, and after application for 30 minutes, it seems...

[PStechPaul]

I wonder if it could be something like a dry bearing that starts galling at a higher speed. That should cause a distinctive sound, especially if you use...

[PStechPaul]

I was going to suggest copper tube or pipe since a plumber would likely have ready access to some, and perhaps even brass or bronze fittings. Just an...

[PStechPaul]

I also have peripheral neuropathy that is getting worse. Neurologist says it could be from long term alcohol consumption, but I don't think I really drank/drink...

[PStechPaul]

The output voltage to the motor depends on speed, so if it is rated 240 VAC at 3500 RPM it would put out more like 120 VAC at 1750 RPM. Can you measure...

[PStechPaul]

You can also use an ohmmeter to check for open circuit from the bus link (+) to each output (T1, T2, and T3), and from each output to GND. Then also in...

[PStechPaul]

Very impressive. You've been busy! Welcome to HSM.

Thanks Paul, I just bought a green stone and a diamond wheel. Will test this week....

[PStechPaul]

Here's info on nanotubes for x-rays.

https://www.thefreelibrary.com/Carbo...o).-a089581030...

[PStechPaul]

I think the evolution of physics (as well as biology), particularly in the last 100 or so years, illustrates how our conception of reality, time, space,...

[PStechPaul]

I did a little digging and found that the author of the paper, to which I linked, was John Manchak of Brigham Young University (BYU), although he may...