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RE: [TCML] watcha think?? COMPLETED Tesla COIL :)
Hello "the iconoclast,'
No offense is intended, Scott, though your comments on black secondary formers are without merit, unless speaking specifically of PVC.
I would imagine that the black 'PVC' used in this coil is, in all actuality, ABS pipe. I have used it as a former with a low voltage-gradient (high-gauge wire) and there were no difficulties, whatsoever, even without any coating. No 'ion-jets' visible in long exposures at low- or medium-power (I didn't want to get my dad's camera too close on full power!!).
Now, if it were - in actuality - black PVC, you would run against some issues. You wouldn't have output which was visible, unless you received a large secondary arc-over.
Most 'black PVC' is ABS pipe, though people are so commonly calling it PVC that it's difficult to know when people are familiar with the difference.
For a secondary former, the absolute worst you can have (barring the most obscenely moronic schemes ever imagined, such as a steel-cored former with inadequate insulation) is gray schedule-80 PVC. "Schedule-80" is a reference to the thickness of the wall; the larger the number, the greater the thickness and, as such, the greater the pressures allowed in its intended application. Its gray colour is derived from its innately being filled with heavy-weight carbon, iron and other pigments which make it a very poor insulator. If you want to employ an impressive determination of usefulness as a secondary former, attempt to charge it electro-statically. If you can't charge it to the point it will pick up a feather or a small amount of iron filings or, if neither are available, make your hair stand on-end, it's a poor secondary former. This is only relevant to plastics; when using a cardboard former, it can be easily charged after you've baked/dried it and/or coated it.
Good luck and Happy Coiling!
- Christopher Karr
To: juliustc81@xxxxxxxxx; tesla@xxxxxxxxxx
From: the_iconoclast@xxxxxxxxxxxxxx
Subject: Re: [TCML] watcha think?? COMPLETED Tesla COIL :)
Date: Mon, 9 Aug 2010 07:03:17 -0700
CC:
I used black pvc from Lowes and it worked fine. Someone explained to me that its the dye. Apparently, some black pvc dyes use carbon as a pigment. The pvc I bought from Lowes was ok.
Sent from my HTC on the Now Network from Sprint!
----- Reply message -----
From: "Julius Crummer" <juliustc81@xxxxxxxxx>
Date: Sun, Aug 8, 2010 8:11 pm
Subject: [TCML] watcha think?? COMPLETED Tesla COIL :)
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Wow i never knew im supposed to get a certain color...well this is gonna have to
work at least for 2 or 3 runs. At Lowes they was out of shorter white ones and i
couldnt afford nor fit a 8 feet long white pvc pipe hehe. I tested the spark gap
using only the NST across them and all the gaps fired. I used 14 gauge wire all
around only because it call for that size in the instructions i was following.
Well im halfway winding the secondary by hand and once i get the variac imma
plug it up and cross my fingers. thanks for the info.
________________________________
From: Scott Bogard <sdbogard@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Sun, August 8, 2010 2:07:52 PM
Subject: Re: [TCML] watcha think?? COMPLETED Tesla COIL :)
Is that black PVC? Because if it is you should look for white, I've
heard bad things about the black with carbon in it... Otherwise it
looks like it will function for testing, use heavier wire in the tank
circuit long term, and shorten your connections. Also I hope your spark
gap is adjustable and that you didn't make it too big, I've no
experience with that type so it is probably Ok. Can't wait to see sparks!
Scott Bogard.
On 8/8/2010 5:11 PM, Julius Crummer wrote:
> Well heres the completed tesla coil minus the secondary winding and the NST is
> off to the side...check out the counterpoise..looks kinds sketchy huh?
>comments,
> advise are welcomed :)
>
> http://www.flickr.com/photos/39213193@N03/4873176176/
>
>
>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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