Re: I'm Sold on MMCs and RSGs! - Pics

["Barton B. Anderson" <tesla123-at-xxxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Hi Deano,

Ignore my post. I tried to send a correction (taking my foot out of my mouth)
but sent it to myself accidentally.
Sorry about that,

Bart

Tesla list wrote:

> Original poster: "David Dean" <deano-at-corridor-dot-net>
>
> Hi
>
> I have a SRSG 1200RPM, six flats, six electrodes. It works perfectly.
>
> >
> > Original poster: "Barton B. Anderson" <tesla123-at-pacbell-dot-net>
> >
> snip
> > > Robin,
> > >
> > > A 1200 rpm motor uses 6 flats to make it synchronous.
> > >
> > > John Freau
> >
> > Yes, 1200 rpm using 6 flats = 120 bps, but the breaks are not
> > divided evenly on
> > each half cycle.
> >
> What does this mean, the breaks are not divided evenly on each
> half cycle?
>
> > Assume one half cycle. This indicates 3 breaks during that half
> > cycle. Now try
> > to divide 3 breaks evenly along that half cycle (can't be done).
> > The best you
> > could do is to manage 2 out of 3 as 1 will be near zero crossing.
> > I would also
> > expect that a break through zero (not firing) could occur often
> > and cause a
> > charging imbance from break to break.
> >
> One half cycle = one break, they always fire at the same point in the cycle.
>
> > A 1200 rpm, 6 flat RSG is only synchronous in that it can lock to
> > the mains
> > cycles, but it should not to perform well as indicated above. I
> > beleive the old
> > RSG program ROTJIT showed this as well.
> >
> > Bart
> >
> >
> IMHO, the only drawback to 1200 RPM for a SRSG is the low speed of the
> electrodes which reduces the power level that can be processed. (electrodes
> must be
> kept narrow to reduce dwell time, less wind than a faster rotary, etc.)
> Of course these problems could be resolved by using a larger diameter disk.
>
> later
> deano