Winding Varnish ???
Hi group , I need to know what type of varnish is used on electrical
windings . I have several projects that will require varnish coated copper wire . Thanks for any good answers to my question in advance . Rick |
Winding Varnish ???
rijo wrote in message
nk.net... Hi group , I need to know what type of varnish is used on electrical windings . I have several projects that will require varnish coated copper wire . Thanks for any good answers to my question in advance . Rick Other than it should be traditional resinous copal varnish, not polyurathane, as far as i know. -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
Winding Varnish ???
"rijo" wrote in message
nk.net... Hi group , I need to know what type of varnish is used on electrical windings . I have several projects that will require varnish coated copper wire . Thanks for any good answers to my question in advance . Rick Rick, I usually use GC Electronics Red Insulating Varnish (p/n 10-9002). -- James T. White |
Winding Varnish ???
In an earlier contribution to this discussion,
rijo wrote: Hi group , I need to know what type of varnish is used on electrical windings . I have several projects that will require varnish coated copper wire . Thanks for any good answers to my question in advance . Rick I'm sure I've heard of Shellac being used for this purpose. -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
Winding Varnish ???
In article et,
rijo wrote: Hi group , I need to know what type of varnish is used on electrical windings . I have several projects that will require varnish coated copper wire . Thanks for any good answers to my question in advance . Rick If you're winding your own coils, start with wire that's already coated. I've wound guitar pickups, power and output transformers for tube amplifiers, and coils for magnetic bearings. I usually buy wire from MWS, although I imagine there are other suppliers, too. You have a choice of several different insulating coatings. Some will melt with the heat of a soldering iron, which makes termination easy, and others require mechanical stripping. Beyond the insulating varnish, you can also buy wire with an additional coating that melts in an oven, fusing the coils together and making the coil rigid without a core or bobbin. There are also coatings that melt with solvent, and pulling the wire through a damp sponge of solvent bonds the coils together. To keep the coils quiet, if they aren't bonded by heat or solvent, you can vacuum pot them in melted paraffin, or some commercial potting compound. |
Winding Varnish ???
"rijo" wrote in message
nk.net... Hi group , I need to know what type of varnish is used on electrical windings . I have several projects that will require varnish coated copper wire . Thanks for any good answers to my question in advance . Rick If you're supposed to use enameled wire (wire with an enamel coating for insulation), use wire that comes that way from the factory ("magnet wire"). If you want to put a heavy plastic coating over a finished coil, I've had good luck with (don't laugh) PVC pipe cement, which is a thin clear plastic glue. |
Winding Varnish ???
rijo wrote: Hi group , I need to know what type of varnish is used on electrical windings . I have several projects that will require varnish coated copper wire . Thanks for any good answers to my question in advance . Rick jijo-- A-C Motor Repair and Rewinding published in 1941 says this--"...dip the coil in a good black baking varnish and bake it dry...The varnish should be kept at a specific gravity of about .84; the coils are dipped cold and allowed to soak about 15 to 20 minutes until the air bubbles stop rising to the surface of the varnish. Then the coils are drained and baked from 6 to 10 hours in an oven with forced ventilation, at from 115-120 C or about 240 to 250 F. For normal operating conditions two dips and baking are preferable...four or five dips and bakes are advisable for bad operating conditions....." I have never insulated my own wire but it can be done--enamel wire just sounds simpler. Good luck, Tut |
Winding Varnish ???
rijo wrote:
Hi group , I need to know what type of varnish is used on electrical windings . I have several projects that will require varnish coated copper wire . Thanks for any good answers to my question in advance . Rick Thanks to everyone who participated answering my question . Thanks again , Rick |
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