Re: synchronous gap help (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 10 Jul 2007 19:07:23 -0500
From: D.C. Cox <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: synchronous gap help (fwd)


Lots of 1 inch dia. copper pipe x 8 inches long and very parallel (Home 
Depot or Lowes) will dissipate a tremendous amount of heat when used in a 
subdivided gap with a good 250-300 CFM blower approx 1/2 inch away.  We put 
them in PVC tubes with a 300 CFM blower on each end --- one pushing and one 
pulling to provide efficient cooling and quenching at 15 kV, 120 mA and 240 
mA (2 in parallel).  The large surface area of the tubes do a great job and 
rotarys not required.

Quenching is best checked with an oscope.

Everyone has one practically in their backyard --- local universities and 
technical schools.  Most of their electronics instructors would enjoy an 
opportunity to help someone building a Tesla coil.  They could probably even 
bring a storage scope to your home and do it there.  Networking in your 
neighborhood is great!   And, don't forget the local HAM radio club ---  
that's how I got started back in '61.  Great group of people who always 
enjoy getting involved in "something slightly different".  Checking 
quenching on a TC would definitely fit the bill as "something different".

Dr. Resonance
Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, July 10, 2007 4:27 PM
Subject: Re: synchronous gap help (fwd)


>
> ---------- 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
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