Re: Triggered gap questions

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Sundog by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sundog-at-timeship-dot-net>

Hi All!

  In the triggered gap I tried awhile (months back), I used a brass rod,
drilled 1 end for a 10/32 brass threaded rod, and the other end for a
press-fitted 1/4" length of tungsten-carbide rod from McMastercarr.
Pressfitting the rod was difficult, even with a 1 ton arbor press, but the
tun-carb laughs at the erosion.  I use the same style electrodes on my
pig-powered coil and the only problem I have is heat (too much power, not
enough mass total).   Works good!


Shad


 ----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, August 01, 2001 11:48 PM
Subject: Re: Triggered gap questions


> Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<bert.hickman-at-aquila-dot-net>
>
> Marc, all,
>
> Once the trigger pulse fires the main gap, the main discharge will flow
> from one of the main electrodes, through the trigger electrode, to the
> other main electrode. The trigger electrode must be robust enough to
> withstand these high current discharges even though there's actually no
> high current flowing into or out of the trigger electrode. Erosion of the
> relatively small trigger electrode in trigatrons is a wearout mechanism.
> Because of high rep rates (120 PPS or possibly more with more
sophisticated
> triggering circuitry in a DC system), I'd recommend using fairly robust
> trigger electrodes and substantial air flow to prevent the trigger
> electrode from overheating or excessively eroding...
>
> Safe triggerin' to you!
>
> -- Bert --
> --
> Bert Hickman
> Stoneridge Engineering
> Email:    bert.hickman-at-aquila-dot-net
> Web Site: http://www.teslamania-dot-com
>
> Tesla list wrote:
> >
> > Original poster: "Metlicka Marc by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <mystuffs-at-orwell-dot-net>
> >
> > mike,
> > this is the nice thing about the whole triggered gap situation, "design
> > is WIDE open".
> > one thing though, the primary tank energy doesn't go THROUGH the trigger
> > electrode "per say", it tends to jump to it and then across to the other
> > main electrode. maybe it does actually go through it, i don't know? i
> > will have to listen to comments by those that are more knowledgeable
> > because i was "AMAZED" it worked great the first attempt?
> > the
> >
> > Tesla list wrote:
> > >
> > > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <Hollmike-at-aol-dot-com>
> > >
> > > Ok,  Here's a question for the triggered gap gurus:
> > >     I have been reading this thread with much interest.  It sounds
like a
> > > great alternative to the SRSG!    One thing I read is that the primary
> > > current passes 'through' the trigger electrode.  My question is, could
the
> > > trigger electrode be positioned slightly out of alignment with the
primary
> > > gap electrodes so the triggered arc would have to take a slightly
'bent'
> > > path?  This, if so, would seem to me to help alleviate heating and/or
> > > corrosion of the trigger electrode.
> > >    It would seem that the trigger electrode could be made into a sharp
> point
> > > and cause the ionization of the space between the gap electrodes to
provide
> > > the conductive channel to form more easily and not actually have the
> primary
> > > current contact the trigger electrode at all(or very little anyway).
> If the
> > > trigger electrode were positioned from below the primary gap
> electrodes, the
> > > heat might also help 'move' the arc away from the trigger electrode.
> > >  The first objection to this idea, I imagine, is that might argue that
this
> > > would effectively make the gap too wide and kill a NST, but if one
placed
> > > another gap or two in series, the triggered gap could have a large
> percentage
> > > length change, but the overall gap length would not change by much.
Having
> > > the series gaps would also seem to aid quenching as well.
> > > Comments?
> > > Mike
> > >
> > >
>
>
>
>
>