Re: [TCML] Secondary with Carbonized Spots

[futuret@xxxxxxx]

 Derek,

When I had this problem, I removed those bottom turns up to the burned point and
slightly beyond the blackened area underneath the wire (assuming the area below is
blackened).  If the coil is wound on a PVC form, then the area beneath will
likely be blackened (carbonized).  If blackened, then I used a razor blade to scrape
away all the carbon, then I spliced a new piece of wire onto the existing wire,
using the "bevel-splice" method, and then I rewound the bottom area with the new wire.
Next, I re-coated the entire secondary with a suitable clear coat material.  

Another approach is to remove just about 1/2" of the winding where it's burned,
and clean away the carbon on the form, then splice the wires together, and
leave the 1/2" gap in the winding, which doesn't seem to matter for the coil's
operation.  

Before you start removing any windings, be sure there's at least enough of a coating
to hold the wire so it doesn't all start springing loose.  Or put some heavy tape
at the ends of the windings that you wish to preserve, until you've finished the repair,
and re-coated the winding. 

Cheers,
John

 


 

 

-----Original Message-----
From: Derek Esq. <a_key_move@xxxxxxxxx>
To: tesla@xxxxxxxxxx
Sent: Sat, Apr 10, 2010 2:20 pm
Subject: [TCML] Secondary with Carbonized Spots


Hey all, 
 
I've got an issue that I figure one or more of you has run into before. I have a 
small coil with a secondary that's about 8" tall that I inherited (not 
literally). It appears that there is no expoxy or anything coating the 
secondary. If there is, it's a very light coating. Somewhere nearer to the 
bottom of the secondary, there are two carbonized spots on the windings. The 
spots are slightly bigger than a spot made if you took a ball point pen and made 
a dot on a piece of paper. When I run the coil, I get arcs from the two 
carbonized spots to the primary. The coil runs fine otherwise with appropriate 
breakout from the topload. 
 
My question is, what can I do about these carbonized spots? Is there a way to 
repair them? If not, how can I prevent these spots from arcing over? Or what's 
the best option?
 
Thanks for all your help,
 
Derek


      
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D
 
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