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RE: Primary holder questions?
Original poster: "Rich & DJ" <rdj@xxxxxxxxxxxx>
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
Just another fly in the ointment for you.
Rich from the middle of Missouri
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, July 03, 2006 7:17 PM
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...