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Re: Rotaty popping, (Was Re: commercial cap failure)
At 10:30 PM 04/23/2000 -0700, you wrote:
>
>> Original Poster: "Robin Copini" <rcopini-at-merlin-dot-net.au>
>>
>>
>> Hi jon, Ed.
>>
>> I noted to the list, last month about this same occurence.
>> Have you checked the firing point on the incoming wave form
>> in relation to your SRSG. If mine is at the wrong point, the thing
>> sounds like a 'dog' and I get continual 'backfires' across the
>> safety gap. Just changing the firing angle turns it into a pussy-cat.
>
>I "timed" my SRSG using the trial and error method. I rotated the motor
>housing in 5 degree increments, and then 2 degree increments, until I
>achieved max spark and max input current, (they coincided). I did this three
>different times, all with the same result. The "happy" firing point seems to
>be quite critical, within a 2 or 3 degree range.
>Just to confirm, my coil runs quite smooth. I have heard a sound like a car
>door slamming just a few times, and when I did hear that sound I didn't
>notice anything else happening, no safety firing, drop in output sparks, not
>even a hiccup. (Heck, maybe what I heard was a car door slamming).
>
snip...
Hi Jon and Robin,
This weekend, I was showing off my little LTR coil. It would not work at
all and instantly blew the NST protection fuse. I then remembered that I
had set the rotary gap to zero phase to work on the Radio Shack strobe
light project. I set it back to the proper place (I have a calibrated
scale on the side of the motor) and the coil worked perfectly again. The
difference in timing was only 1.1mS or 12 degrees. Sync gap timing is very
critical and more so on LTR systems.
Cheers,
Terry
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