[TCML] Considering a new coil build...
bartb at classictesla.com
Wed Mar 25 19:18:45 MST 2009
Travis Tabbal wrote:
> Sounds like I need to think bigger. I guess if I'm going to buy
> a nice pulse cap I may as well build the big coil while I'm at it though.
Cool! Bigger is better if you have the cap energy and power to back it up.
> Any thoughts on where to obtain flat copper strip in suitable sizes and what
> those sizes are? With 1/2" tube, the primary gets wide fast, and I can get
> the turn to turn spacing lower with strip.
I bought my ribbon here at
This was 32 mil ribbon 1" width and perfect for my SRSG coil. The price
was good and it came in in excellent shape.
Here are a few pointers with ribbon. While purchasing G10 12" square
discs for the RSG at McMaster-Carr, also purchase Garolite for the
standoffs. Garalite is easily tapped, so you can mount with screws the
standoffs to a base. Wood working skill saw is what I used to cut it. I
set up a fence and a stop for the 1" depth. Pretty simple. Actually,
with my standoffs, I first tried to cut strips in the bottom and top
caps (1/2" each). This worked great for winding (which is why I did it),
but it didn't work well when placing the top cap. The best way I found
was to go ahead and slice 1" depth slots in the Garolite and use a 1/2"
simple top cap. I did this on the later four standoffs.
The number of standoffs is important!!!!!!! If you try to go with only
4 stand offs around the coil, you'll be hardpressed to get it even and
accurate. I had the hardest time with this. I finally broke down and cut
four more standoffs for a total of 8. I was then able to manage
something usable. If I were to do it again, I would use 8 total and cut
them all for nice fit.
> How about holding the flying electrodes into the G10 disk?
David will have the best info for your here. I used tapped holes in the
side of a G10 disc. Nothing ever come loose, but there was a study
performed by a coiler on the possibility. It seemed then best to use
collars on each side of the rotating electrodes to ensure the electrode
is well set in place.
> For the toroid, going bigger means fabricating them. I have yet to make a
> decent looking dryer duct toroid. Any tips there?
For a bigger coil, then certainly a bigger toroid is needed. The best
homebrew toroid I've made was to use corregated tubing and then to cover
in plaster of paris and some other similar compound (50/50 ratio). After
the goop dried, I sanded smooth and covered in Al tape then smoothed the
tape out by rubbing the tape with a Craftsman 1"D socket. Came out
excellent and felt as smooth as my spun 9 x 30 toroid. There are of
course cages or ring toroids you could do. Since your toroid needs to be
rather large, the later might be a better option for you.
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