JAVATC version N

["Tesla list" <tesla@xxxxxxxxxx>]

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

Hi All,

I updated Javatc for primary dimensional purposes. Sorry if this is 
off topic at times, just like to keep you all aware of any changes made.

Anyway, I've noticed coilers now and then are off on their tune point 
a turn maybe. Well, I ran into the same thing myself. I've been 
building helical and cone primary's for some testing of my own. I 
used the same tubing (pulling it on and off out of 3/8" acrylic 
standoffs). Eventually, it was a mess to reuse. So, went out and 
purchased new tubing to rebuild my flat primary (which I normally 
use). The standoffs were 2" ht, with .25" tuning, .25" spacing (edge 
to edge). Anyway, after assembly, I measured inner and outer 
diameters and it wasn't in tune!! So, I figured I had messed it up 
the measurement. I did. Remeasued, came up with 7.3 turns, tapped, 
sparked, and sure enough 50" arcs on a 12/60 NST.

I thought there are probably coilers using Javatc who have ran into 
the same problem. So, I drew up an image to identify just what Javatc 
is looking for when it comes to primary's. This image will now be in 
the help popup for the primary.

Here's a look.
http://www.classictesla.com/java/script/primeas.gif

I now it's simple, but you might be amazed at how people "guess" at 
this particular measurement. Just thought I would help any misconceptions out.

BTW, in the process of building these primary's using acrylic 
runners, I found a simple way to ensure a tight fit yet still be able 
to snap the primary in and out as necessary. Simply use a hacksaw and 
slice 1" down the runner starting at the bottom inner of the socket. 
It adds plenty of flex for the "snap action".

Here's an image of what I'm describing.
http://www.classictesla.com/temp/Pristand.gif


Take care,
Bart