Re: Formulas

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Mddeming-at-aol-dot-com>

In a message dated 2/15/01 1:48:41 PM Eastern Standard Time, tesla-at-pupman-dot-com 
writes: 


>
> Original poster: "Jason Johnson by way of Terry Fritz <twftesla-at-uswest-dot-net>" 
> <hvjjohnson13-at-hotmail-dot-com> 
>
> Does anyone have a formula for calculating the AWG size of a wire from the 
> diameter (preferably in inches), and/or a formula for the number of turns 
> per 
> inch based upon the AWG? I need these formulas for an excel spreadsheet so 
> the 
> simpler they are the easier it is for me to put them in. They need to have 
> fairly good accuracy (+/- 1% or less). Also I haven't really looked around 
> for 
> them yet, but if anyone has any formulas for inverse conical (saucer shaped) 
> primaries I could use those too. 
>
> Jason Johnson 
>
>


Hi Jason, 
        Try this for a close-wound coil:  h=0.3176*N*exp(-0.1104*G) 
G= AWG Number    N=Number of turns in coil        h=height of winding in 
inches 
It should be pretty accurate for sizes 6 to 40, but some people close-wind a 
little tighter than others. 
Matt D.