RE: Primary holder questions?

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Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Cool!

Mine measure right at 0.250 inches (yep! I got Starrett hole gauges too ;-)):

http://drsstc.com/~sisg/files/SISG-coil/PrimaryDeck.JPG

But I might need to "hammer" it a bit as needed  :o))

The blocks have full machine indexes so they can always be 
re-machined with say a 1/4 inch mill back and fourth as needed.  But 
hammering is easy and more compatible with that "go fever" thing 
:o))  This project is already 6 months behind...  Gotta launch!!

Cheers,

        Terry


At 06:48 PM 7/3/2006, you wrote:
> When I made mine I had to drill the holes over size because with a small
> coil you get a small radius for the copper coil and if you think about
> the tube you are going to snap in is not a 1/4 dia straight but a 1/4"
> segment of a circle. I drilled mine approximately .007 oversize (size
> "F" drill).
>  Just another fly in the ointment for you.
>
> Cheers
>         Rich from the middle of Missouri
>
> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Monday, July 03, 2006 7:17 PM
> To: tesla@xxxxxxxxxx
> Subject: Primary holder questions?
>
> Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi,
>
> 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:
>
> http://drsstc.com/~sisg/files/SISG-coil/PrimaryQ-01.gif
>
> 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...
>
>
> Cheers,
>
>         Terry