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RE: Primary holder questions?

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>


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


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!!



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.

        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>


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...