Nikola Tesla’s 3 Plane Balancing Analysis Part 3 - The Concentricity Is Improved

Ideally the concentricity could corrected on professional cylindrical grinding machine that is parallel to the rotor discs. Or even on a large lathe is another way.

However, that would cost a fair bit to do properly and we wouldn't learn anything about this important 1st stage of Tesla's balancing method, or would we learn how to tame passive magnetic bearings.

We are trying to follow Tesla's method from British Patent 186,799 with the rotor in situ of it's final resting place.

Extract from British Patent 186,799:

"Preliminary to the application of the process it is advisable to run the part at a very low speed and true it with the wheel. If there exists appreciable flexure of the shaft when the system rests horizontally, the grinding may be done in a vertical position when it is in static balance."

Now I'm too sure what you would class as a flexible shaft, but this one has been seen to flex greatly when static balance at rpms of 1200 - 1400rpm. Therefore because the bearings are so sensitive I think the final truing of the rotor should be done with a 120 grit wheel and with the rotor static balanced.

With a rotor this large spinning it up using compressed air is not an option.
Using the belt will be necessary to effect the balancing and we are waiting to get a flat belt pulley for the motor, so the shaft doesn't need a pulley or tape.

The pull from the belt can be offset by adjusting the magnet array.

What we are missing as some quality measuring tools such as a few dial test indicators and an engineers spirit level.

Also the equation to calculate the critical is going to be slightly different to the basic equations. I think the critical calculation is a must to be able to carry out Tesla's method.

How can the balancing operator set the speed at a submultiple of the critical if they don't know what the critical speed is? Therefore anyone trying this method and not doing these calculations are shooting in the dark.

We have tried balancing without doing the calculations and have certainly improved the balance.

Next I plan to show what the first sub harmonic looks like and then show what it looks like with a temporary weight added to correct the static balance alone.

Then I will do a final grind on the concentricity before attempting a joint dynamic and static balance with the temporary weight removed.

That is if I can calculate the critical properly. Otherwise I will have to static balance the rotor and than dynamic balance the ends. I will go into more detail when I get further.

Here is the patent:

https://teslauniverse.com/nikola-tesla/patents/british-patent-186799-process-and-apparatus-balancing-rotating-machine-parts

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