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Re: synchronous gap help (fwd)
---------- Forwarded message ----------
Date: Tue, 10 Jul 2007 15:32:32 -0600 (MDT)
From: Chip Atkinson <chip@xxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: synchronous gap help (fwd)
I've run my pole pig coil through 1/8" tungsten rods just fine. They never
got hot for me. What I did was put them in some large aluminum holders
with the tungsten right down the middle.
Go to http://www.pupman.com and look at the link that says "my rotary
gap". I used a phenolic bushing in the side of the plexiglas to hold the
aluminum but I don't think that was too necessary. I believe that the
wind caused by the whirling disk serves to keep the points cool.
Chip
On Tue, 10 Jul 2007, Tesla list wrote:
>
> ---------- Forwarded message ----------
> Date: Tue, 10 Jul 2007 21:20:22 +0000
> From: David Rieben <drieben@xxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Cc: drieben@xxxxxxxxxxx
> Subject: Re: synchronous gap help (fwd)
>
> Scott, all,
>
> I would ere toward too large than too small, too. However, I'm
> not so sure that you're local welder's supply shop will have 1/4"
> diameter tungsten electrode rods on hand, as this is a quite a spe-
> cialty item that sees little use in common welding. I obtained some
> 1/4" tungsten rods before from an online welder's supply through
> mail order, but I had to purchase an entire container of (10) 7" lg.
> rods and they had to be backordered and imported from Germany.
> IIRC, they cost me around $115, but that was a few years ago be-
> fore the spike in the commodity prices of copper and tungsten. Check
> out ebay item # 320136339908 (Ebay seller "Metallectric"). This
> seller is selling tungsten round stock in various diameters up to 1"
> at the standard $4.89/ounce. I have not personally purchased any
> from this seller yet but his feedback profile shows 100% + feedback,
> so he should be safe to deal with.
>
> David Rieben
>
> -------------- Original message --------------
> From: "Tesla list" <tesla@xxxxxxxxxx>
>
> >
> > ---------- Forwarded message ----------
> > Date: Tue, 10 Jul 2007 16:12:05 -0400
> > From: Scott Bogard
> > To: tesla@xxxxxxxxxx
> > Subject: Re: synchronous gap help (fwd)
> >
> > Doc R. is probably right, while I use an 1/8 rod for my MOT array (lower
> > voltage, but higher current, roughly the same wattage), I only do short
> > runs, the longest being 1 minute solid (call me paraniod, but I just don't
> > want my finicky MOTs to die, their track record is not so good (not to
> > mention I usually flip the breaker on extended runs, hopefully some PFC caps
> > will fix this)). So, if you plan on the average run being a few minutes, go
> > for the bigger rod. With that said, does anybody know where I could find a
> > 1/4 in. tungsten rod? I haven't checked my local welding shop yet, as I am
> > sure they have them, my concern is price, is there some magical place where
> > everybody gets their tungsten because it is cheap? Thanks.
> > Scott Bogard.
> >
> >
> > >From: "Tesla list"
> > >To: tesla@xxxxxxxxxx
> > >Subject: Re: synchronous gap help (fwd)
> > >Date: Tue, 10 Jul 2007 13:21:23 -0600 (MDT)
> > >
> > >
> > >---------- Forwarded message ----------
> > >Date: Tue, 10 Jul 2007 14:04:49 -0500
> > >From: resonance
> > >To: Tesla list
> > >Subject: Re: synchronous gap help (fwd)
> > >
> > >
> > >
> > >At this power level I would suggest 1/4 inch dia. electrodes. 1/8th inch
> > >may overheat to redhot on the electrode tips and cause poor quenching.
> > >
> > >Resonance Research Corp.
> > >www.resonanceresearch.com
> > >
> > >
> > >----- Original Message -----
> > >From: "Tesla list"
> > >To:
> > >Sent: Tuesday, July 10, 2007 11:07 AM
> > >Subject: RE: synchronous gap help (fwd)
> > >
> > >
> > > >
> > > > ---------- Forwarded message ----------
> > > > Date: Tue, 10 Jul 2007 08:11:56 -0700 (GMT-07:00)
> > > > From: penny831@xxxxxxxxxxxxx
> > > > To: Tesla list
> > > > Subject: RE: synchronous gap help (fwd)
> > > >
> > > > I have a related question on the propellor gap. I'm planning on pushing
> > > > 15/120 through an .125 thoriated tungsten electrode. Is that to much
> > >power
> > > > for such a small electrode? Your thoughts would be appreciated.
> > > >
> > > > -----Original Message-----
> > > >>From: Tesla list
> > > >>Sent: Jul 10, 2007 7:27 AM
> > > >>To: tesla@xxxxxxxxxx
> > > >>Subject: RE: synchronous gap help (fwd)
> > > >>
> > > >>
> > > >>---------- Forwarded message ----------
> > > >>Date: Tue, 10 Jul 2007 08:55:27 -0400
> > > >>From: "Lau, Gary"
> > > >>To: Tesla list
> > > >>Subject: RE: synchronous gap help (fwd)
> > > >>
> > > >>I think you're going to run into a problem using your relatively small
> > > >>teletype motor to spin-up such a heavy 3/8" thick disk. I was barely
> > > >>able to get such a motor to spin a 09" thick x 6.12" diameter G10 disk
> > > >>with just 4 brass acorn nuts electrodes, and it utterly failed to sync
> > > >>with anything larger. I'd strongly recommend using a propeller gap if
> > > >>using a Teletype motor. My SRSG page:
> > > >>http://www.laushaus.com/tesla/sync_gap.htm, and Terry Blake's:
> > > >>http://tb3.com/tesla/sparkgaps/index.html
> > > >>
> > > >>Regards, Gary Lau
> > > >>MA, USA
> > > >>
> > > >>> ---------- Forwarded message ----------
> > > >>> Date: Mon, 09 Jul 2007 23:59:58 +0000
> > > >>> From: ameen_ghavam@xxxxxxxxxxx
> > > >>> To: Tesla list
> > > >>> Subject: synchronous gap help
> > > >>>
> > > >>> I'm building a 240 bps srg for my tesla coil and was wondering
> > > >>if
> > > >>> anyone would give me any tips or suggestions. I'm planning to use a
> > > >>3/8 "
> > > >>> g10 rotor 8" in diameter with 4 1/4 " tungsten electodes held on with
> > > >>> shaft collars (the disc is pinched between the collars). A sheet metal
> > > >>> ring connects these electrodes. I have two stationary electrodes (one
> > > >>> gap). My motor is a Teletype 1/12 hp motor, synchronous, and runs at
> > > >>3600
> > > >>> rpm. Any tips on how to balance, cut the g10 (i've heard its hard to
> > > >>cut),
> > > >>> motor arbor, or anything else I should know? Also, please email me off
> > > >>the
> > > >>> list. Thanks.
> > > >>>
> > > >>Cheers,
> > > >>>
> > > >>> Ameen Ghavam
> > > >>>
> > > >>
> > > >>
> > > >>
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > >
> >
> > _________________________________________________________________
> > http://liveearth.msn.com
> >
> >
> >
>
>
>