---------- Forwarded message ----------
From: *Garry Freemyer* <garryfre@xxxxxxxxxxx
<mailto:garryfre@xxxxxxxxxxx>>
Date: Tue, Jun 1, 2010 at 10:04
Subject: Re: [TCML] Frying tesla coil
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx <mailto:tesla@xxxxxxxxxx>>
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.
________________________________
From: Quarkster <quarkster@xxxxxxx <mailto:quarkster@xxxxxxx>>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx <mailto: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
<mailto:garryfre@xxxxxxxxxxx>> wrote:
From: Garry Freemyer <garryfre@xxxxxxxxxxx
<mailto:garryfre@xxxxxxxxxxx>>
Subject: [TCML] Frying tesla coil
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx
<mailto: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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