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Re: First big magnifier run
> Date: Mon, 10 Feb 1997 22:27:51 -0700
> From: Tesla List <tesla-at-poodle.pupman-dot-com>
> To: Tesla-list-subscribers-at-poodle.pupman-dot-com
> Subject: Re: First big magnifier run
> Reply-to: tesla-at-pupman-dot-com
> > Subject: Re: First big magnifier run
> > >>> Subject: First big magnifier run
> > >Subject: Re: First big magnifier run
> > >>> Subject: First big magnifier run
> > Subject: Re: First big magnifier run
> > >>> Subject: First big magnifier run
> > >Subject: Re: First big magnifier run
> > >>> Subject: First big magnifier run
>
> Subscriber: tom_mcgahee-at-sigmais-dot-com Mon Feb 10 21:50:04 1997
> Date: Sat, 8 Feb 1997 11:53:30 -0500
> From: Thomas McGahee <tom_mcgahee-at-sigmais-dot-com>
> To: tesla-at-pupman-dot-com
> Cc: rhull-at-richmond.infi-dot-net
> Subject: Re: First big magnifier run
>
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> ----------
> > From: Tesla List <tesla-at-poodle.pupman-dot-com>
> > To: Tesla-list-subscribers-at-poodle.pupman-dot-com
> > Subject: Re: First big magnifier run
> > Date: Saturday, February 08, 1997 1:25 AM
> >
> > >>> Subject: First big magnifier run
> > >Subject: Re: First big magnifier run
> > >>> Subject: First big magnifier run
> >
> > Subscriber: rhull-at-richmond.infi-dot-net Fri Feb 7 23:00:12 1997
> > Date: Fri, 7 Feb 1997 18:56:16 -0500 (EST)
> > From: richard hull <rhull-at-richmond.infi-dot-net>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: First big magnifier run
> >
> > At 12:25 AM 2/7/97 -0700, you wrote:
> > >>> Subject: First big magnifier run
> > >
> > >Subscriber: nikki-at-fastlane-dot-net Fri Feb 7 00:22:55 1997
> > >Date: Thu, 6 Feb 1997 03:18:57 -0600 (CST)
> > >From: Bert Pool <nikki-at-fastlane-dot-net>
> > >To: tesla-at-pupman-dot-com
> > >Subject: Re: First big magnifier run
> > >
> > >At 10:41 PM 2/5/97 -0700, Ed Wingate wrote:
> > >
> > >>> Subject: First big magnifier run
> > >>
> > >[big snip]
> > >
> > >>
> > >>Bill and Bert,
> > >>
> > >>Congrats and welcome to the magnifier ranks. Isn't it great to have one
> > >>work so well on the first try? Especially a magnifier. I am sure that
> > >>you will make it to your goal considering your results so far. I'm
> truly
> > >>glad that the stationary electrode moved away from instead of toward
> the
> > >>rotor studs with possibly disasterous results. One small example why
> > >>safety is paramount.
> > >>Keep up the good work.
> > >>
> > >>Ed Wingate
> > >>
> > >>
> > >
> > >Thanks Ed! It's the caps you sold me that are running this thing. I'm
> > >gonna stick a big bright yellow bumper sticker on my coil (does it
> really
> > >have a bumper?) that says "Powered by Wingate." :)
> > >
> > >I'm thinking about drilling a hole through each of my stationary
> electrodes
> > >and putting a cotter pin through just in case the set screw vibrates
> loose,
> > >or if I forget to lock it down again, then the electrode _can't_ move in
> too
> > >far.
> > >
> > >Bert Pool
> > >nikki-at-fastlane-dot-net
> >
> >
> > Everyone else,
> >
> > I think Ed and Bert remember this from the Teslathon talk I gave here
> last year.
> >
> > My Series quench rotary is mounted about 10 feet up in the air on the
> rear
> > wall of the lab. Maggie 11-A was firing one time and one of my tungsten
> > disk rim electrodes came adrift and zinged out at bullet velocities. The
> > imbalance in the large wheel vibrated the entire rear wall of the lab
> (20'
> > X17') so bad that the neighbors ran out and thinking a prop plane was
> trying
> > to avoid crashing as it raced its engines near the ground!!!!
> >
> > Inside the lab it sounded like the end of the world at the lab
> reverberated
> > from the huge sounding board. I was quick enough to kill the gap motor
> so
> > that motor shaft 5/8" was not bent. But it was quite an experience. I
> > found the electrode stuck in the concrete floor.
> >
> > Richard Hull, TCBOR
> > >
> > >
>
> Richard,
> There isn't much we can do about having an electrode fly off of a rotary
> gap, but there is a way we can reduce the damage that comes immediately
> after.
>
> A fail-safe relay can be constructed so that the spark gap begins rotation
> when a switch is first put in its *on* position and then a *start* button
> is pushed. This temporarily activates the relay, which then continues to
> stay activated because of a pair of now closed relay contacts. A *panic*
> switch that is normally closed can be pushed to turn off the relay at any
> time. The *panic* switch can be made somewhat automatic if it is made to
> open whenever there is severe vibration at the spark gap. This can be
> effected by using a snap-type switch, like those made by Microswitch, and
> having a piece of metal attached to the metal lever. If the metal is the
> right length and has a mass of metal attached at the end, then if there is
> a certain amount of vibration it will activate the switch. Such a switch
> would need to be calibrated as to what mass of metal to use so that it
> doesn't trip under normal operating vibrations. For best results it should
> be mounted near the motor. By adjusting the length of the lever and the
> mass on the lever it is possible to make the circuit operate at any desired
> sensitivity. In fact it can be made so sensitive that it just might turn a
> spark gap off before any major damage is done and even before anything
> breaks loose. (Though it will only protect in those cases where the problem
> shows itself in vibration before breakage occurs. The design is really for
> immediate shutdown whenever vibration above a certain point is sensed.)
>
> Another thing that can be done is to wire the relay contacts up so that the
> armature goes to the motor, the (N.C.) goes to the *other* side of the
> motor, and the (N.O.) goes to the AC (Hot). This arrangement makes it so
> that whenever the relay is *off* the motor is not only disconnected from
> the AC (Hot), but also has the two motor leads shorted out. This will cause
> the motor to come to a stop a bit faster than usual. (It is not as good as
> a true electric braking system, but if you already have the relay, you get
> this extra feature for free, so why complain?)
>
> If anyone wants a GIF of the above circuit, I would be happy to e-mail it
> privately. I take it that attaching GIFs to Tesla list mail is either a
> no-no or not implemented. Am I right?
>
> Fr. Tom McGahee
Tom,
I think that your vibration sensor, latching relay idea to shut down the
rotary motor in an emergency unbalance is a very good one!
rwstephens