Re: building primaries

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

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Hollmike-at-aol-dot-com>
> 
> In a message dated 6/26/01 9:43:36 PM Mountain Daylight Time,
> tesla-at-pupman-dot-com writes:
> 
> <<
>  when trying to make a primary coil, i find it very hard to manipulate the
>  copper tubing into the perfect flat primaries that some other coilers have
>  without denting it or without having some akward spiral as the result.   how
>  do you guys do that??! >>
> 
> Usually, when you buy a roll of refer tubing, it is already coiled fairly
> close and you just gently adjust the diameter of the turns one at a time.  If
> you are using tubing that is not new, you could start by winding it in a
> helix around a bucket or large pipe first and then manipulate the turns one
> at a time

	If it's old and work-hardened it pays to anneal it first.  Bright red
seems to work OK, followed by drop into cold water to break off some of
the oxide and make it safe to handle.  It can be cleaned up with HCl and
steel wool, either before or after winding.

Ed