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Re: First light great.



Original poster: "david baehr" <dfb25@xxxxxxxxxxx>


Does the inside really need to be conductive ??? My toroid is settin' on an upside down plastic salad bowl.............I just spiral ( ? ) the wire up to the toroid..................it works, but heck,I dont know!!!





>From: "Tesla list" <tesla@xxxxxxxxxx> >To: tesla@xxxxxxxxxx >Subject: Re: First light great. >Date: Fri, 27 May 2005 11:29:20 -0600 > >Original poster: "Bart B." <bartb@xxxxxxxxxxxxxxxx> > >Hi Daniel, > >Tesla list wrote: >>Original poster: "Daniel Koll" <dk_spl_audio@xxxxxxxxxxx> >> >>Ok, thanks. I will try making a toroid first but have some >>questions. When I make the disc out of wood, should I cover the >>whole thing in AL tape? > > >Yes. This is just a simple way to place a center disc into the >toroid. Obviously, anything metallic will also work, but I usually >have wire spool ends around so I use them for the purpose. Simply >find something like a round wire spool end or whatever that is >already round and near to the inner diameter of the toroid >selection. If for example, you choose a 3"x12" toroid, the inner >diameter would be a 6" disc. Before you cover with Al-Tape, drill a >hole through the disc. The hole would be for a small diameter bolt >(rounded head) used for attaching the top secondary wire to. Cover >in Al-Tape completely (top, bottom, and sides). Use a glass jar or >similar to rub the Al-Tape as smooth as you can get it. Then, place >the bolt through the pre-drilled hole and fasten with a nut. The nut >side should be inserted from the bottom of the disc up to the top so >that the side which is facing the secondary has minimal protrusions. > >>Even the bottom? Anything else I should know? I will start with >>the 3"X12" that you recommended unless someone on the list doesn't >>think that is a good starting point. > > >After building the inner disc, simply form the flex tube to the same >shape so that the disc rides center of the inner diameter. You >should use Al-Tape again around the entire toroid to make it as >smooth as possible. I just tear off strips and place them one at a >time until it's to my liking. This will secure the disc to the tube >and create a nice small toroid. Use the glass jar on the tube as >well to rub out any protrusions from the tape. > >I set up a little coil a few weeks ago and had an old Al-tape toroid >I used. I decided to go into the garage and take some photos. >Sometimes pictures are better to explain these things. I'll pop them >up to my website. >http://www.classictesla.com/temp/Img_0615.jpg >http://www.classictesla.com/temp/Img_0618.jpg >http://www.classictesla.com/temp/Img_0619.jpg > >Be careful with the Al-tape. It can be sharp. >>If I would have known about the coupling I would have changed my >>design. >>This is my first coil and I had never heard of this ever being a >>problem. I ran the coil for probably 2 1/2 minutes total with this >>issue. The secondary seems to be fine and in as good condition as >>when I started, I hope the streamers didn't make pin holes through >>the enamel and polyurethane. If the new toroid does fail then I >>guess I will remove some of the secondary windings. My secondary >>is wound for 16" so if I take off a 1/4-1/2" I don't think the >>output will be reduced too much. > > >No, the output would not be affected. There are many things which >could have happen. Coupling and tuning are two most common problems >coilers run into. Both can cause racing sparks and can often be >difficult to distinguish which (or both) may be the problem. There >are other possibilities as well. If a visual inspection of the coil >looks ok (both inside the form and out), the coil is likely ok. They >can take some abuse to a degree. >>Finally, many people said that maybe it was just out of tune. >>Isn't the coil tuned when you achieve the largest spark output? >>All I did was trial and error until I saw what I think was the >>biggest sparks. >This is a perfectly suitable method to tune the coil as long as >nothing is damaged in the process. With high powered coils, this can >be chancy. Your coil is not high powered, so I think it's fine. >However, a far more precise method is to calc the system first. >Unless the user made an error in the calculations, usually only >minor adjustment is necessary for best output. > >It would probably be a good idea to give further specs on other >parts of the coil. Such as: cap size and type, spark gap, primary >turns, primary inner and outer dimensions. These are the common >specs for running a pretty good analysis on your coil. With that >info, the coupling and tuning can be calc'd very precisely. JAVATC >will tell-the-tale if you give it accurate data. If your >uncomfortable with the program, just give your specs here and I'll >run it for you. > >http://www.classictesla.com/java/javatc.html > >Take care, >Bart B. > >>Thanks >> >>>From: "Tesla list" <tesla@xxxxxxxxxx> >>>To: tesla@xxxxxxxxxx >>>Subject: Re: First light great. ........