Rewinding Coils

Subject: Re: Rewinding ign coils
Date: Sun, 24 Sep 2000 08:58:24 +1000
From: "PETER LOWE" 

Hi Andy

Usually the enameled wire is sold by weight, which is hard to relate to the number of turns you want. Yes, you must also count the number of turns and measure the thickness of the wire with the insulation stripped off. This is done by carefully burning off the enamel from the wire with a candle or cigarette lighter without burning the copper too much. Then using 1200 wet&dry give the burnt copper a gentle wipe along its length to remove the carbon. You then get a micrometer and measure the thickness. There are standard wire thicknesses so you go fro there.

You can measure the resistance of the coil as you get to the required thickness on the coil former. This later method means you have to compromise the insulation integrity of the wire by taking a bit of the enamel of the measure the resistance. Not usually recommended for this easy job.

I used to wind coils when I worked at BHP and it was always done on the number of turns, you do not have to be precise, + or - 10 or so turns is fine. Modern enameled wires have a better insulation quality than those of times gone by so you will never have any problems again, although there are different grades of insulation.

Go to a motor rewinder and get some wire and have a go, it is fun.

I use my lathe on low speed for winding and layers winding is best, that nice even layers form side to side building it up evenly.

Any problems give me a yell. the above instructions are as clear as mud, hey. Peter, NSW, Oz

 
       ----- Original Message ----- 
       From: Andy 
       To: stationary-engines 
       Sent: Saturday, September 23, 2000 6:16 PM
       Subject: Rewinding ign coils

       Hi List,

I have this magneto with a real weak spark ( Lucas SR1), I removed a coil from a known good magneto, and fitted it to the problem maggy. Result; good spark, now I have a stuffed coil. I've taken readings of the good coil and found two of the readings are 6.25k (OHMS) but on the bad one the readings were 28.30m and 31.35m. I don't have any spare coils, so do I pay to get it rewound or do I have a go! Now for the big question, how do you do it? weigh the wire or count the turns.I have only basic tools.

       Andy..........
       Townsville Qld
       OZ
       a323245@austarnet.com.au

This article is part of the Stationary Internal Combustion Engine Frequently Asked Questions (FAQ). This series is a combination of my views and knowledge and the views and knowledge of other people - most of them members of the Stationary Engine Mailing List (More info on ATIS). Those articles which were written by others are © Copyright to the author. Those articles written by myself are © Copyright to Paul Pavlinovich.

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Last modified Sunday, 20-Jul-2003 15:28:00 BST

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