Fwd: [TCML] Frying tesla coil

[Phillip Slawinski <pslawinski@xxxxxxxxx>]

On Tue, Jun 1, 2010 at 10:04, Garry Freemyer <garryfre@xxxxxxxxxxx> wrote:

> Hmm, now that is much more believable than Gary Lau's idea that after hours
> and hours of operation, it was over-coupling, I think I'll go in and amend
> my video to say it is still a mystery and say some suggest it is material in
> the form but later I'm told they have strict rules about this and that it
> could be that the insulation simply broke down. I did find what looked like
> metal fragments in the form in three different places rather deep, but it
> could have been silver paint, or who knows.
>
> I definitely remember a member saying that the place where he worked dumped
> floor sweepings into the vat of molten plastic but now I find myself
> irritated that someone would say this when maybe it didn't happen. I
> believed them and now I feel like I've been made a fool of.
>

Well, if you remember someone saying it on this list it must be true then!
Nobody ever says anything wrong on this list.

Anyways, while we're on the topic of PVC imperfections I thought I'd share
some of my experience.  I've made several secondaries for my DRSSTC.  I got
a really good deal on some 3.5" O.D. PVC.  For a while the PVC worked okay,
until I started pushing the coil really hard.  When I say "hard" I mean over
5X secondary length (12" x 3.5" winding).  I quickly discovered that the PVC
pipe I use is foam walled.  I had internal flash overs on two secondaries
before I started filling them with oil.  Now I've replaced the internal
flash overs with lots of leaking.



>
>
>
>
> ________________________________
> From: Quarkster <quarkster@xxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Mon, May 31, 2010 11:23:09 PM
> Subject: Re: [TCML] Frying tesla coil
>
> Gary -
>
> I think that it is MUCH more probable that what is shown in your video clip
> is a simple insulation breakdown and turn-to-turn short between two adjacent
> turns on your secondary. Over the years I have personally seen this happen
> twice, and both times the appearance was EXACTLY what is shown in your clip.
>
>  Facts about plastic extrusiuon machines:
> 1. Because of the high cost and fine finish on extrusion dies, every
> precaution is taken to ensure that no abrasive material is ever allowed into
> the material hopper.
> 2. Extruders are almost universally equipped with wire mesh "filter
> screens" that filter out any particles of foreign that may accidentally be
> introduced with the resin granules. Google "extruder screens" to see how
> fine these screens are.
>
> As far as seeing darker specks or blobs in white PVC, this is easily
> explained by any one of several different sources:
>
> 1. Extruders may run different color materials at different times. Although
> every effort is made to purge the machine of the previous material, small
> chunks of material may get stuck in the feed screw or other areas. Later,
> when a different color material is being run, these chunks may finally break
> free and pass into the extrusion stream, where they end up in whatever
> material and shape the extruder is currently running.
>
> 2. Bits of material may get stuck in the melting zone of the extruder,
> where they eventually start to breakdown (carbonize). Bits of this material
> may slough off from time to time, and appear as dark specks or patches in
> the extrusion.
>
> Best regards,
> Quarkster
>
> --- On Mon, 5/31/10, Garry Freemyer <garryfre@xxxxxxxxxxx> wrote:
>
>
> From: Garry Freemyer <garryfre@xxxxxxxxxxx>
> Subject: [TCML] Frying tesla coil
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Monday, May 31, 2010, 6:16 PM
>
>
> This is a video of my tesla coil frying due to foreign matter in the PVC
> pipe that forms the secondary.
>
> One person on the list mentioned that they sweep the floor and dump it all
> into the molten plastic so PVC can contain metal fragments, bug parts, hair,
> wire, screws etc etc.
>
> I was surprised how easy it was to upload videos to Youtube...
>
> http://youtube.com/watch?v=L_40Oq3UKVY
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