Re: [TCML] WINDING A FLYBACK

[Adam <teravolt.org@xxxxxxxxx>]

I'm not so sure rubber cement would be a good insulator. I used teflon tape
because it is very plastic, and when pulled tightly it for the most part
conformed to the windings and squeezed air out.

As for rosin, use a 50 50 mix of beeswax and rosin. That's what they used
to use in the 40s for insulation, and it works well. Doesn't shrink on
cooling and it's nice and plastic.

http://imgur.com/a/OPw3U

On Tue, Nov 22, 2011 at 7:25 PM, Scott Bogard <sdbogard@xxxxxxxxx> wrote:

> Yeah I think I'm going to avoid potting it, as much as that will give a
> better product, to build a vacuum machine to do it properly, I think I'll
> try other routes.  I'm thinking the rubber cement and paper will be a good
> idea, should be voltage resistant, and I can coat the wire with fresh
> cement as I wind it, ensuring no air underneath.  Than again the idea of
> using rosin is good as well, and will be less likely to break down over
> time, and require less heat than wax, so as not to damage the teflon.  I
> think I'm going to have to try some things, if I have more questions I'll
> be sure to send them your way.
>
> Scott Bogard.
>
> On 11/22/2011 3:15 PM, Adam wrote:
>
>> Don't use parrafin. The problem I've encountered with that is its massive
>> shrinkage when it cools, which leads to cracks and air bubbles. Instead
>> use
>> beeswax, or a mixture of rosin and beeswax. It doesn't shrink nearly as
>> much.
>>
>> http://i.imgur.com/UOQ5U.jpg
>>
>> As for leading the wire thru, I just put the next layer of tape 'under'
>> the
>> wire, so it's just a continuous spiral.
>>
>> On Tue, Nov 22, 2011 at 12:37 PM, Scott Bogard<sdbogard@xxxxxxxxx>
>>  wrote:
>>
>>  Hi Adam,
>>>     That is impressive, not exactly what I was looking for but impressive
>>> nonetheless, elegant in its simplicity even.  My only concerns are thus,
>>> the presence of air between windings since it is not technically potted
>>> (which could be rectified easily by swapping out the electrical tape with
>>> some kind of paper, and then potting in paraffin or epoxy, as long as it
>>> does not get too hot to melt the Teflon) and how long it took to build
>>> (25
>>> hours, ugh...)  I am planning on making a number of flybacks, so I will
>>> have to find a way to expedite the process, even if it is just mounting
>>> it
>>> on a rotating rod.  You have given me much to think about, thanks very
>>> much
>>> for sharing, I'm thinking maybe I will do this with paper coated in
>>> rubber
>>> cement (which shouldn't melt Teflon, and provide decent dielectric
>>> shielding) I'll probably have to make one layer at a time, since it won't
>>> stick to itself, but should make a fairly rigid finished product,  How do
>>> you do the lead through from one layer to another?  Just leave the wire
>>> sticking out until you put down your tape then bring it over?
>>>
>>> Scott Bogard.
>>>
>>> On Mon, Nov 21, 2011 at 6:31 PM, Adam<teravolt.org@xxxxxxxxx>  wrote:
>>>
>>>  Not sure if I'm doing this right....
>>>>
>>>> But this might help you somewhat http://teravolt.org/fryback.**php<http://teravolt.org/fryback.php>.
>>>> It's
>>>>
>>> my
>>>
>>>> results at making an FBT.
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