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Dave,
"Pretty close" is not good enough. When your gap drifts far enough away
from optimum synchronization, the NST will fail permanently.
Look at the old posts that describe how to file flats on a motor
armature to convert it to a fully synchronous motor. Then, you can use
a Freau phase adjuster to precisely set the phase angle of the motor
without having to mechanically rotate the motor body.
(Another) Dave
On 9/17/2014 7:12 PM, Dave Boyle wrote:
Oh now you tell me! Hey what about if I operate my spark gap motor in
the synchronous zone? At 1 or 2 beats per cycle with the nst switched
off while the motor changes speeds? I have an led strobe synced to the
ac line light that I use to see when the disc is at the right
position. I can't get a phase lock but I can keep it pretty close.
Maybe I should build a custom inverter that will run the motor at only
those speeds that are safe.