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Old Oct 03, 2012, 12:37 AM
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Turn that thing around...naaaa
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It is working great for me. I use Plasti-Kote #228 Grey Primer, 500*F resistant. It is not as hard as the epoxy so it's important to go easy on the first layer of windings on a full coated stator. And this is a new can. I found out this stuff uses titanium dioxide, didn't see aluminum oxide listed. My last can used it. I would suppose about any metal oxide will conduct heat better than epoxy or plastic.
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Old Oct 03, 2012, 07:24 AM
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Jack
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Yeah, but that titanium is a lot heavier than the aluminum! I can't believe you're getting away with increasing the wing loading like that...

So much good stuff being shared here. It almost time for me to salvage a couple of stators that got pushed to the back dead motor pile.

Jack
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Old Oct 03, 2012, 08:41 AM
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Epoxy might cause hot spots under it or prevent winding heat from sinking into the stator. Bad in my book. Thermal conductivity is extremely low, mainly absorptive. The titanium is not as good as al but still much better than plain enamel. I'm going to be sure my next can has aluminum oxide.
You would think any respectable engine enamel and primer would not hold heat in the engine, but transfer it out. Oh well, at least I figured out what I have.

Just for fun, and for those who don't know math can look at the relative properties:

http://en.wikipedia.org/wiki/List_of...conductivities
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Old Oct 03, 2012, 09:10 AM
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On my way to the auto parts store...with my reading spectacles
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Old Oct 03, 2012, 09:21 AM
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Look up the product and it's MSDS sheet on the web first and save the trouble.
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Old Feb 02, 2013, 09:03 AM
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Nice!
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Old Apr 11, 2013, 07:52 AM
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After reviewing this thread I see it needs updating. As soon as I'm back online at home I'll do a start to finish post on this process with pictures. In the learning process I tried allot of unnecessary steps, but here it is in a nutshell. KISS comes in handy here.
1) Clean the stator of loose coating and oil.
2) Lay out some foil to catch excess powder and pile on some coating. I use my finger tips and a little shovel I made. The pile can be shoved and flattened with a small screw driver or something, if needed. If you don't like it dump it off and start over.
3) Cook in a convection oven at recommended temp for about 20 Min. I have not tried a regular oven but wouldn't be surprised that it would work fine.
4) Clean up, if needed, is easy with an Exact knife, needle file, sand paper. rotary tool with diamond dust burr, you get the idea, just avoid removing metal.
5) Repeat on other side. The coating does not soften when once cooked.
6) If you don't like the results remove the blemish and re-coat and recook.
This has proven to work very well and holds up to over heat as well.
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Old Apr 11, 2013, 11:40 AM
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That is a wonderful summary of how to do it, zero. This is your thread so you can edit post #1, I suggest you put a link in post#1 to the above post as being the one post that best summarizes the best method to do this.

This is a thread that will get frequent mention here, almost every time a winding newbie drops in I think.

Jack
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Old Apr 21, 2013, 12:27 PM
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See post 1
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Old Apr 30, 2013, 10:22 PM
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Something to look at, at the end.
Or is it?
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Old Jan 31, 2016, 05:14 AM
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homo ludens modellisticus
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Thread added to openining post of
Sticky: (Re)winding and building motors, tips & tricks, checks & tests

Vriendelijke groeten Ron
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Old Feb 13, 2016, 02:46 PM
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How do u erase a whole post ?
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Old Feb 21, 2016, 02:54 AM
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Quote:
Originally Posted by Chophop View Post
Epoxy might cause hot spots under it or prevent winding heat from sinking into the stator. Bad in my book. Thermal conductivity is extremely low, mainly absorptive. The titanium is not as good as al but still much better than plain enamel. I'm going to be sure my next can has aluminum oxide.
You would think any respectable engine enamel and primer would not hold heat in the engine, but transfer it out. Oh well, at least I figured out what I have.

Just for fun, and for those who don't know math can look at the relative properties:

http://en.wikipedia.org/wiki/List_of...conductivities
With what thermal conductivity do you think coating the windings would be good?
It seems to be very common to pot stators in commercial resins that aren't even that conductive. No one with a model plane does it. Once the heat can get to the motor's aluminum mounting plate it would easily travel to a heatsink/'motor mount, further benefiting from the airflow, maybe even an aluminum external structure of the plane.



I got the very thin fiberglass linked a couple pages back...thought it might be simpler and possibly allow more room for copper. Very disapointing. too hard to do for me. Very hard. I give up. Don't recommend it.

Epoxy remover won't damage the lamination isolation I guess. I'll try that and the powder coat. How did the harbor freight paint go jack?
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Old Feb 21, 2016, 07:17 AM
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Jack
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".. How did the harbor freight paint go jack? ..."

I was not working on a stator that was completely bare of the insulation coating as much as I was working on on stators that had spots of damage where the green coating had flaked off.

I have not used the HF powder paint yet but others here have. So far I have used Tyvek, Nomex, and Kapton I bought in sheet form. Of those three the Nomex seemed to work the best. I also used a Loctite 410 that is a painted on rubberized coating that sets up. That was hard to find and sort of on the expensive side and it went bad and set up in the bottle so I did not pursue it very far.

To remove a stator coating I soaked a stator in Acetone for a day or so and the stator fell apart into a collection of loose plates. That is not a good thing to do as, if I understand it right, you want to have the plates insulated from each other and glued together in a stack with a thin glue.

zeroback gave a good description for using the HF powder here:

Stator coating - www.rcgroups.com/forums/showthread.php?t=1702834

Jack
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Old Feb 21, 2016, 08:00 PM
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I'd read acetone is bad, I guess it will destroy the thin insulation between plates. I'm still wondering if the epoxy remover will destroy it as well.
?
Don't want to do that
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