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Forum Index : Electronics : Large toroid winding
| Author | Message | ||||
| kentfielddude Regular Member  Joined: 09/05/2019 Location: United StatesPosts: 98 |
I'm trying to figure out what I need to finish the primary winding and prepare the core for the secondary. The enameled wire got some small nicks in the enamel on the outside windings. What's the best red insulating varnish to use to repair it? What type of mylar should I buy? What's the best way to connect my two split windings together?  |
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| Pete Locke Senior Member  Joined: 26/06/2013 Location: New ZealandPosts: 185 |
I've had great success using nail polish/varnish to touch up nicked copper wire enamel. It's also good (using clear nail varnish) for coating the copper side of hand etched PC boards preventing oxidation of the tracks. Cheers Pete'. Edited 2026-08-05 05:18 by Pete Locke |
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| Godoh Guru  Joined: 26/09/2020 Location: AustraliaPosts: 687 |
As Peter Locke says the varnish doesn't have to be red. You could get some varnish from a motor rewinding shop if there is one near. I just use normal polyester varnish ( stuff for wood) on my transformers. I dip them in a tub when I have finished winding them and leave them for a day or so then let them air dry. As for mylar tape, I have used Terylene tape on my transformers, I bought some online and it is easy to work with. I would have used fibreglass tape but I hate the stuff it makes me itch too much so I went for the next temperature grade down. Pete |
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| Solar Mike Guru Joined: 08/02/2015 Location: New ZealandPosts: 1235 |
On all my inductors and transformers I dip them in a solution of liquid polystyrene, then hang out to dry for a couple of days. Get couple liters of car spray paint thinner in a metal bucket with a lid, add pieces of expanded white polystyrene, it dissolves very easily, keep adding until the dissolve rate really slows. That's your dipping solution, dries to a hard clear coating. it will soften with heat, but your transformer should never run that hot anyway. Mike |
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| tinyt Guru Joined: 12/11/2017 Location: United StatesPosts: 562 |
I used this. Available from our local Home Depot store.  The beginning of this thread in another forum is how I re-wound the COTS toroid. It is smaller than what you have. Edited 2026-08-05 23:10 by tinyt |
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| kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 98 |
There's this 1in 100ft of mylar for $8.20 I Was thinking about getting. They also have thicker as well. They also carry a mylar with adhesive backing. https://cshyde.com/item/films/mylar-polyester-pet-film/2mil-mylar-1in-100ft adhesive: https://cshyde.com/viewitems/ategories-tapes-with-adhesive-specialty-film-tapes/mylar-film-tape-with-adhesive |
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| kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 98 |
anyone use Glyptal 1201 and then bake the transformer? I have a electric oven I Can bake it in. |
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| Godoh Guru Joined: 26/09/2020 Location: AustraliaPosts: 687 |
I used to be a motor rewinder many years ago. We always baked our motors after dipping them in varnish. The only ones we didn't dip were ones that were too big for our varnish pit then we use Hymeg red varnish and gave them plenty of coats. You asked about Mylar tape with adhesive, I have used some but it is not good for taping the whole winding on a torroid as it is too hard to get the roll of tape through the centre of the torroid without it sticking to everything. Mylar tape that is not sticky works fine, but for me Terylene tape was much easier to use. Pete |
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| kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 98 |
Thanks Ill look into terylene tape |
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| Godoh Guru Joined: 26/09/2020 Location: AustraliaPosts: 687 |
The advantage of Terylene tape is that it can be pulled very tight without breaking. I wind the tape off the roll around my thumb and little finger then tie the end around the middle of the stuff I have wound onto my fingers to make a bow. That way you just pull the piece that you began with out of the bow and tape the transformer. Terylene tape |
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| kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 98 |
I couldn't find terylene tape here in the USA. I did some searching and I think its the same stuff as Dacron which I can get from this place in the usa. https://www.baewire.com/DACRON-TAPE-3-4-X-72-YRD-HSP-p/tape1122x.75.htm |
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| Godoh Guru Joined: 26/09/2020 Location: AustraliaPosts: 687 |
That Dacron looks fine, it says it has a rubber adhesive, so that may make taping it around the torroid harder, depends on whether it is sticky before it is heated. It looks cheap enough though to try out. Pete |
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| kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 98 |
I'll see Croylek will ship to the USA and how much it would be. The 10% tarrif isn't an issue but I've heard they can charge like $35 brokerage fee. |
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| Godoh Guru Joined: 26/09/2020 Location: AustraliaPosts: 687 |
Motor rewinding products USA Have a look at the above link they have polyester tape and lots of other stuff |
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| kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 98 |
They are based in Canada but they do have polyesterlink Edited 2026-08-07 23:07 by kentfielddude |
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| kentfielddude Regular Member Joined: 09/05/2019 Location: United StatesPosts: 98 |
Whats the best way to go from 16mm^2 soild copper enamel wire to a hookup wire? Compression lug? |
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