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Re: Primary holder questions?

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Terry,

I did this which helps the flex and snap action.

Hammering in the copper is usually part of the frustration factor when the copper is difficult to push in. Cutting the flex slots really helps.

Take care,

Tesla list wrote:

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>


I am making a small 4 inch ID primary coil with 1/4 inch copper tubing stuffed into 1/4 inch thick Lexan with 1/4 inch holes and 3/8 inch pitch. The supports are little 1/4 inch thick Lexan chunks that look like this:


I figure I will just mill off the top to get that "snap in" thing ;-)) So I was wondering how much to mill off? At 1/8 inch above the center line I get, a "squeeze" of 0.2165 inch. Easy to mill that as much as I want to like 0.001 inch. Don't want to go "too" far ;-))

Any suggestions as to how far to mill the 1/4 inch holes for the "snap in" are welcome ???;-))

Since the 1/4 inch copper tube is running $1.60 per "foot" =:O I was wondering about smearing, rubbing, and generally coating it with that electrical anti-oxidant grease used in big box connections these days. Normally an aluminum wire thing, but I wonder if that grease, or some other, would help keep the copper all shinny over the years?

I also note the little coil's Rac resistance is about 150 ohms as actually measured in three ways now... That is about 100 ohms less than all the "programs" predicted... Prolly a post for a different subject line... But all is "weird" in Rac land...