Re: [TCML] Looking for feedback

[bunnykiller <bunnikillr@xxxxxxx>]

Hey Stephen...

A rather rough manner to set up a sync rotory gap is as follows

1. turn off the rotory gap align the electrodes
2. turn variac to 0 and turn on coil raise variac voltage slowly untill 
gap fires, mark the seting on the variac
3. turn on rotory gap and rest variac to 0 turn on coil turn variac to 
setting you had to mark
if rotory is "aligned", gap should fire. If it doesnt fire, rotory gap 
electrodes are not aligned to Peak. goto step 4.
4. Rotate motor/disc ( depends on your design of motor mount etc) a few 
degrees CCW.
5. retest starting at step 3.

depending on how many electrodes you have on the disc, you should only 
have to do steps 3,4,5 thru 90 degrees or less of adjustment.

There are other ways to align the motor/disc but it requires a strobe of 
some manner that flashes at the same time as the peak of the voltage 
running the rotory gap.

Scot D



Stephen J. Hobley wrote:

> Hi,
>
> Thanks for all the suggestions. I tried to verify that the motor is true
> 1800 rpm (30 r.p. 's.' - my fault) by attaching tape to the spark points
> and passing the wheel close to a photodetector. 
>
> Testing like this I do indeed get 120 "bangs" per second. The phase
> varied slightly but in any one second of sampling I saw 120 dips in the
> scope. I then put up a trace of the 60 Hz AC to my house and compared
> the dips to the peaks and troughs of the AC - by accident my last
> adjustment had lined them up pretty well, excluding the odd phase shift
> (which I put down more to the "lash-up" I was testing with) all the
> "bang" points lined up with just after the peaks and troughs of the AC.
>
> I've just wheeled it outside for another test and this time the results
> were even worse than before. As I cranked up the variac I started to get
> a burst of sparks of maybe 10 bangs, then nothing, with a total cycle
> time of about 1 second. Increasing the voltage evened out the bangs
> eventually but the arc length from the toroid was nothing special. 
>
> The motor + gap is from Alan - 
>
> http://cgi.ebay.com/Tesla-Coil-Synchronous-Rotary-Tungsten-Gap-Motor-Rot
> or_W0QQitemZ140255853036QQihZ004QQcategoryZ4665QQtcZphotoQQcmdZViewItem
>
> ..so I'm pretty sure it's the right kind of motor.
>
> I would have put this on camera, but the coil does not sound healthy so
> I'd rather not run it very much.
>
> Any thoughts? 
>
> Steve
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
>  

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla