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 Posted: Thu Oct 7th, 2021 03:21 pm
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Todd Armentrout
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getting there

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Last edited on Thu Oct 7th, 2021 03:33 pm by Todd Armentrout

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 Posted: Thu Oct 7th, 2021 03:22 pm
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Todd Armentrout
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still polishing

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 Posted: Thu Oct 7th, 2021 03:23 pm
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Todd Armentrout
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Not perfect but better than it was

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 Posted: Thu Oct 7th, 2021 03:46 pm
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Todd Armentrout
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Don't mind the reference dots. They will come off. In the photo it still looks a bit oily, but really its pretty clean and dry. I ordered some 3m glass cloth electrical tape and some hemp string for the coils. I have a stock of EL600 insulating varnish on hand. Any thoughts? 

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 Posted: Thu Oct 7th, 2021 06:16 pm
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Todd Armentrout
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I thought I had a broken wire. Looks like it was just a fiber. I guess this cheapo microscope is earning its place in the shop. From what I can tell everything looks decent so far.

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 Posted: Tue Oct 19th, 2021 08:34 pm
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Todd Armentrout
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Apologies. It has been a bit since my last. This is one of the coils. Cleaned up a bit with several coats of varnish. I have it drying on a low voltage and low amp setting. My plan is to wrap with 3m scotch 27 tape. I would love other suggestions as I really don't want to bugger this up at this point.  

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 Posted: Tue Oct 19th, 2021 08:59 pm
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Todd Armentrout
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I do have a question regarding the rectifier. Once the plug end is wired in does it matter which prong goes to which side of the switch? Hopefully my photo attaches. Apologies in advance if it does not.

Attachment: wiring.pdf (Downloaded 78 times)

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 Posted: Tue Oct 19th, 2021 09:23 pm
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William Dunlap
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I normally run the positive to the switch bat, but it really doesn't matter. If your fan runs backwards, just switch the brush leads. You have a 50/50 chance of getting it right first time...
Cheers,
Bill

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 Posted: Tue Oct 19th, 2021 10:04 pm
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Todd Armentrout
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Bill, you sir, are a saint. Thank you for enduring my many questions. I do want to make sure I understand though. You are saying that it doesn't really matter which of these goes to which. If it runs backwards simply reverse the connections and I should be on track, correct? Also do you have any input as to wrapping coils in the 3m scotch 27?

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wiring.jpg

Last edited on Tue Oct 19th, 2021 10:06 pm by Todd Armentrout

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 Posted: Wed Oct 20th, 2021 12:12 am
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William Dunlap
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You've got it right, I think. No idea about the 3M product. I use a cloth loom wrap on field coils, fiberglass cloth on speed coils.Cheers,
Bill

Last edited on Wed Oct 20th, 2021 12:13 am by William Dunlap

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 Posted: Wed Oct 20th, 2021 05:13 pm
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Todd Armentrout
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Probably not the neatest job of wrapping, but it was the first. Here is the ohm reading. Could anyone tell me if I am in the ball park please.

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Last edited on Wed Oct 20th, 2021 05:14 pm by Todd Armentrout

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 Posted: Wed Oct 20th, 2021 05:15 pm
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Todd Armentrout
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meg ohms at 125

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 Posted: Wed Oct 20th, 2021 05:16 pm
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Todd Armentrout
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and at 250

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 Posted: Thu Oct 21st, 2021 09:04 am
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Lane Shirey
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3m friction tape would have been a better choice to wrap the coils in than a vinyl tape.  You should be ok because I wouldn’t expect the DC field to get warm, but vinyl tape usually isn’t great to use on a motor. 
And yes, the incoming rectifier leads don’t matter, because it’s AC. As Bill said, the hot should go to the switch.  If the fan runs backwards, then switch the + and - leads at the rectifier. 

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 Posted: Thu Oct 21st, 2021 11:49 am
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Todd Armentrout
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Lane, Thanks for the recommendation. I will definitely keep that in mind and add some to my "fan kit." The wire on both coils was in quite good condition. If for some reason it starts to get too warm or my OCD gets ahold of me I can always switch it over as long as I'm careful and take my time. I went with the glass tape for several reasons, foremost being lack of education. Lastly because it is marketed as being for coils on the 3m site. 
I do want to express my sincere gratitude to everyone who has posted a response or comment. Every person who has made a suggestion or left a comment has taught me something new. The project is far from over and there will be more questions coming. I can only hope that my many questions may help someone else in the future. 

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 Posted: Tue Nov 2nd, 2021 11:16 am
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Todd Armentrout
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Has anyone ever re insulated the brush holders on one of these fans? Testing between the armature and coils I found some leakage. I believe I isolated the cause to the rather old insulation around the brush holders. I was hoping someone might have some suggestions as to a suitable replacement. Barring locating an insulating sleeve, my first thought would be a layer or two of quality heat shrink. Any thoughts or suggestions are greatly appreciated. 

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Last edited on Tue Nov 2nd, 2021 11:28 am by Todd Armentrout

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 Posted: Sat Apr 30th, 2022 04:31 pm
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Todd Armentrout
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 Posted: Sat Apr 30th, 2022 04:33 pm
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Todd Armentrout
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It's been a while but this is the most recent progress. Much thanks to everyone who offered guidance. I'm looking for a suitable spot to pla e the rectifier. Does anyone have any photos of where and how they positioned theirs?

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