Re: Primary holder questions?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Terry,

It looks like you are using acrylic for the supports.  There isn't 
much give for snapping purposes like HDPE and this might affect the 
size of the "C" and how close you mill to the center of the 
hole.  You may want to try one hole on a scrap piece of acrylic and 
experiment first.

Gerry R.

> 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