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RE: Simple Rotor balance approach, second thought

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hi Jared, Et All,

Static and dynamic rotor balance.

Hmmm not always true evidently. My rotor runs true for four static
electrodes set at 1mm with a feeler gauge. I ran it up to 1000 rpms than got
nervous re your input. There was not any noticeable vibration. All my brass
through all tread were cut by a machinist. ALL my 1/8 X 1.5" were cut by
diamond ground. I assembled the rest. Perhaps I got lucky and got a very
flat G10.

Second thought:

My center hole is 1/2". What if one was to, after complete assembly, take a
centered allthread sized to width plus nut size, ok weight the nuts. With a
centered hole bored to the diameter of a solid guitar string; they come in
several gauges to choose from. Thread through the string, suspend and
balance the other dimension. It seems to me the smaller the center point the
greater the balance accuracy.

A flywheel shop is unaccustomed to our way of doing things. The few
flywheels I have here are pretty heavy and close tolerance centered at the
factory with a mongo hub. Would they make one out of 3/4" square piece of
steel? Sure $$.

Just a thought on the other Dimension. Might Work...

Long live your Spark Gap,
Jim Mora

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Tuesday, April 25, 2006 8:59 AM
To: tesla@xxxxxxxxxx
Subject: Simple Rotor balance approach

Original poster: Jared E Dwarshuis <jdwarshui@xxxxxxxxx>

There are two types of ballance, static and dynamic. A static ballance
may work just fine, but it is not good enough for all situations.

One can have a disk with perfect static ballance, that is still
horribly imballanced. For example, suppose I placed a large bolt that
protrudes a few inches from one face of the disk. Then I rotated the
disk 180 degree and placed another identical bolt on the opposing
face. Now we have a situation where we are staticly ballanced, but our
dynamic ballance is horrible.

If you still have roughness after a static ballance you might consider
consulting a
Speed shop. They can dynamicaly ballance parts such as flywheels,
perhaps they can ballance a rotor as well.

The materials Gar-lock, G-10 etc. (can) have a lot of variation in
thickness from one side of the sheet to the other,in which case
dynamic imballance would be inevitable.

Sincerely: Jared Dwarshuis