Re: first coil issues (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 17 Aug 2007 00:35:51 -0700
From: huil888 <huil888@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: first coil issues (fwd)

Hi Bart -

I think there may be a slight miscommunication here .......

Proximity is a synonym for "nearness" or "closeness".

"Increasing the proximity" would mean reducing the distance between the two 
objects, or bringing them closer together.

I think you meant "increasing the distance" between the primary and 
secondary.

Regards,
Scott
----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, August 16, 2007 8:36 PM
Subject: Re: first coil issues (fwd)


>
> ---------- Forwarded message ----------
> Date: Thu, 16 Aug 2007 20:15:06 -0700
> From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: first coil issues (fwd)
>
> Hi Drake,
> The proximity between coils is 1" and fine if your at or below the
> bottom winding on the secondary. A wee bit high on coupling when even,
> so if your there, look out for racing sparks or pri to sec arcing (or
> even orange glowing spots in that vicinity).
>
> A 1/4" copper tubing would do just fine for this coil. I personally like
> a 1.5" spacing with this coil size between inner turn primary and 
> secondary.
>
> The MMC, well, it sounds like you simply have some proximity arcs
> occurring (my read on it). Increase proximity. Oil will help, but isn't
> necessary. I keep my MMC's spaced by about 1/2". I think you can figure
> out what you need to do for that cap to stop the arcing. It's really in
> your hands and if it's proximity arcing, then just increase the
> proximity. Oil is ok, but unnessary unless you just don't want to change
> it all again. I can certainly understand that feeling. I started my
> first MMC in the worst possible configuration. Even blew a cap due to my
> naive considerations. I eventually mounted them on a 8" pvc cylinder
> which naturally spaced them out and has actually been very convenient
> over the few years since I've built it.
>
> http://www.classictesla.com/photos/mmc/mmc.html
>
> A 12/90 NST can get some decent sparks. You simply need to clean up the
> loose ends.
>
> Take care,
> Bart
>
>
> Tesla list wrote:
>
>>---------- Forwarded message ----------
>>Date: Wed, 15 Aug 2007 20:07:17 -0500
>>From: Drake Schutt <drake89@xxxxxxxxx>
>>To: Tesla list <tesla@xxxxxxxxxx>
>>Subject: first coil issues
>>
>>Hi All,
>>I've been tinkering with my coil off and on for the past few days and just
>>when i thought i had everything set, i'm having more troubles.  The first
>>issue was the vaccum motor broke off its mounts, then the spark gap
>>electrodes broke off and now my MMC is broken.  I mounted it on i think 
>>1/8"
>>thick plexiglass which i can now tell you cracks very easily.  I 
>>desoldered
>>the caps and tried configuring them on a cutting board from walmart.  The
>>leads were too short to thread through the board so they are literally
>>soldered together (rather haphazardly) in strings sort of like this:
>>
>>
>>====|
>>====|
>>====|
>>
>>the strings all terminate in about the same spot and i'm using some bare 
>>Cu
>>(maybe 6 awg) grounding wire a nice fella at home depot gave me for free.
>>The trouble now is when I turn the varic up to about 60V the MMC bank 
>>starts
>>sparking noisily.  I cannot spot anywhere where the caps have failed or
>>carbon tracking on the PE mounting board.  I tried insulating the "bus 
>>bars"
>>with some PE tubing which helped a bit.  I am thinking about putting them 
>>in
>>a container filled with oil to keep it from shorting out.  What do you 
>>think
>>would be a good short term solution as I am sort of nearing a deadline 
>>with
>>a project for school.
>>
>>Also- I was using I/O gauge wire in my tank circuit but it was just too 
>>hard
>>to work with.  I'm now using #6 stranded wire.  Can I go smaller?
>>
>>What would be a good primary tap (1/4 Cu tubing)? as the one i'm using now
>>was sort of lashed together
>>
>>Thanks a million
>>drake schutt
>>
>>p.s.- dave do you remember it ever being sooo hot here?  I can hardly 
>>stand
>>just going outside.  I sort of feel guilty for watering my grounding rod
>>during a drought ^_^
>>
>>pps-  coil specs:
>>
>>xfrmr- 12kv/90ma
>>cap- 0.028uf@32kv
>>primary- 1/4 cu tubing, 8.5in ID, 21in OD
>>secondary- 6.5" OD-  30" of #22
>>top load- 6"x24" ducting/pizza pan/Al tape (slightly dented, w/6" copper
>>breakout point)
>>
>>
>>
>>
>>
>>
>>
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