Re: Secondary

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

Original poster: "claude masetto" <claudmas-at-optusnet-dot-com.au> 

Ian, don't worry about heat damaging the enamel. We bake windings at 190 c.
Glad to hear your secondary went ok.
Claude.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 15, 2004 10:27 AM
Subject: Secondary


 > Original poster: "Ian McLean" <ianmm-at-optusnet-dot-com.au>
 >
 > Hi everyone,
 >
 > Small update on my first coils progress.  I wound my secondary today !  By
 > hand.  Well ... I did make up a makeshift jig, but I turned the jig by
hand,
 > no power tools  Boy are my hands sore now.
 >
 > It took about 4 hours ... :-o
 >
 > I have wound 1,200 turns of 0.63mm enamelled copper onto my 6" thin-walled
 > PVC form (stormwater pipe).  The form was completely sanded back to a nice
 > pure white and coated with 4 coats of polyurethane sealer before I started
 > winding.  I did not bother drying the form first before sanding and
sealing
 > it.  I couldn't fit it in the oven, and as it has been raining here, I was
 > too impatient to wait for and leave it in the sun for a few days.
 >
 > The windings are very snug and tight, and it looks really good.  No kinks,
 > overlaps, or gaps anywhere.  My winding length came out at just over 33
 > inches.  I am removing about an inch of windings from the top of the form
 > and space winding the last few turns in that spot.  Final winding length
 > will be 32".  I wound it all the way snug up to the PVC cap on the pipe
(PVC
 > caps temporarily on both ends to allow bolts for the jig), to ensure the
 > windings laid nice and straight.  I want to remove the inch from here to
 > leave about 2 inches free at the top of the form for space winding 1 or 2
 > turns and toroid spacing.
 >
 > Just the primary to do now and a topload.
 >
 > It was a good experience for my first coil, but I don't think I will ever
 > wind another secondary coil like that again ;)
 >
 > BTW, I have not sealed the windings yet, so I have wrapped copious amounts
 > of electrical tape around both ends until tommorrow when I will seal it.
I
 > am planning on using L.S.E. (Liquid Styrene Epoxy, i.e. fibreglass resin).
 > If anyone has better suggestions for sealing my windings please let me
know.
 > I am a little concerned about LSE heating up too much during curing and
 > damaging the enamel on the windings ...
 >
 > Regards
 > Ian
 >
 >