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05-19-2010, 08:19 PM
| #1 |
| Quarry Creeper Join Date: Jun 2005 Location: Las Vegas
Posts: 443
|  Hand winding armatures?
I'm going to order up some blank arms and 20-22 awg magnet wire and TRY winding some 30-45 turn armatures. I've done a fair amount of searching and found lot's of good info both here on RCC and the web EXCEPT for one thing...what type of epoxy is use to coat the finished arm? I found some info on the basic's of how the epoxy diping and curing is done but nothing I was able to find told me the type of epoxy that was used. I figure the 5 to 30min epoxy I use for building airplane is not gona cut it. I know folks wind arms without epoxy coating and I suppose they run fine... is it really worth the trouble of epoxy coating? Any other info you may have about winding arms would be welcome as well  |
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05-19-2010, 08:46 PM
| #2 |
| Quarry Creeper Join Date: Oct 2009 Location: St.Louis
Posts: 280
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Epoxy coating is used on lower wind motors to prevent the winds from flying out of the arm due to the high RPM's. Coating the winds wil epoxy will throw off the balance of the rotor if not done properly!
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05-19-2010, 08:48 PM
| #3 |
| Rock Crawler Join Date: Mar 2009 Location: Victoria BC
Posts: 988
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i dont bother appoxying mine, they dont spin fast enough to need it, just make sure your winds are nice and tight and arnt goin to come undone and rub the magnets in the can. untill ur winding high speed motors i wouldnt worry about it, but when u get inth the speed you will ned to balance them aswell
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05-20-2010, 03:45 AM
| #4 |
| Quarry Creeper Join Date: Jun 2005 Location: Las Vegas
Posts: 443
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Thanks for the replies, 30-45T is certainly not high speed even on 3's...I won't bother with the epoxy coating. John |
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05-20-2010, 06:09 AM
| #5 |
| Pebble Pounder Join Date: Oct 2009 Location: South Korea
Posts: 131
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Do you know a good place to order supplies from? I'm looking for somewhere that will ship international.
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05-20-2010, 03:36 PM
| #6 |
| Quarry Creeper Join Date: Jun 2005 Location: Las Vegas
Posts: 443
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Knitewulfe, the ONLY place I could find new blank armatures was integy...as much as I hate to buy intgey I THINK the arms will be OK... I'm sure I'll need to true the comm but thats no biggie... not sure if they ship international. As for the magnet wire... you can find it fairly easy on the net or if you have any local electronics supply stores they may have it... I know radioshack carries it... and frankly they suck for an electronics supply store these day's. John http://www.integy.com/cgi-bin/webc.cgi/st_sresults.html link just takes you to the search page... for some stupid reason it won't link to the actual product page... typical integy F'd up web site... anyway just type in 540 size armature in the search bar. Last edited by JSN; 05-20-2010 at 03:39 PM. |
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05-20-2010, 03:41 PM
| #7 | |
| dnf   Join Date: Sep 2009 Location: Under a big fkn rock.
Posts: 1,901
| Quote:
its not just speed,its heat. most everything grows[expands] at it heats. wire is no different. it may be tight when you wind it[cold] but while you are running the wire heats and expands. I would suggest epoxy it down if you can. | |
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05-20-2010, 03:47 PM
| #8 | |
| Quarry Creeper Join Date: Jun 2005 Location: Las Vegas
Posts: 443
| Quote:
Ok... what type of epoxy do I use? I plan to at least static balance the armatures anyway so I'll just epoxy then balance IF I can figure out what epoxy to use!!!! | |
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05-20-2010, 03:51 PM
| #9 |
| Rock Crawler Join Date: Jan 2009 Location: San Gabriel, Crawlerfornia.
Posts: 507
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what wall size are u supposed to use thin or thick?
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05-20-2010, 03:58 PM
| #10 | |
| dnf Join Date: Sep 2009 Location: Under a big fkn rock.
Posts: 1,901
| Quote:
I have read and freaking read. but somone is supposed to hook me up................ eddio.......... he said it comes in 2 gal. buckets and is $$$$$$$$$ but that he would give a look see as to what else may work in its stead. so stay tuned to the holmes [winding a motor thread]. | |
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05-20-2010, 03:58 PM
| #11 |
| Quarry Creeper Join Date: Jun 2005 Location: Las Vegas
Posts: 443
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I'm FAR from an expert but I did rip apart an old 35T arm... it was thin wall so thats what I ordered.
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05-20-2010, 04:03 PM
| #12 | |
| Quarry Creeper Join Date: Jun 2005 Location: Las Vegas
Posts: 443
| Quote:
EDDIEO is the ONLY person that really even briefly talks about epoxy coating in the threads I searched here on RCC... is this some sort of super secret squirl epoxy  do I need to have my military security clearance reinstated | |
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05-20-2010, 05:04 PM
| #13 |
| dnf Join Date: Sep 2009 Location: Under a big fkn rock.
Posts: 1,901
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actually I had first learned of it from johns thread winding a motor. in his winding a motor thread,epoxy is mentioned. and I think he said something about using a popsicle stick to help pack it in as I recall. but what type of epoxy is something I never found. may have over looked it though. there is so much info to absorb here on rcc its incredible. |
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05-20-2010, 06:41 PM
| #14 |
| Quarry Creeper Join Date: Jun 2005 Location: Las Vegas
Posts: 443
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still looking... I found this krylon product, I wonder if this varnish would be good enough? http://www.kpg-industrial.com/produc...lating_varnish |
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05-20-2010, 06:49 PM
| #15 |
| dnf Join Date: Sep 2009 Location: Under a big fkn rock.
Posts: 1,901
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sound promising, it will handle the heat it looks like. but it says it has great flexability?I dont know if thats neccessarily a good thing. maybe eddie will chime in. |
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05-20-2010, 06:54 PM
| #16 |
| Quarry Creeper Join Date: Jun 2005 Location: Las Vegas
Posts: 443
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05-20-2010, 08:44 PM
| #17 | |
| Pebble Pounder Join Date: Oct 2009 Location: South Korea
Posts: 131
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05-20-2010, 11:43 PM
| #18 |
| I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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I'll sell you blank arms...you should be using a 4mm web for 45t and up and 5mm web for anything under 45t.... On the epoxy....it runs about $150 for a gallon and goes bad after about a 2 year...one type is epoxylite 478, but I found better secret stuff. I looked at the top two links, avoid the spray on stuff. The other stuff looks like it would sort of work, but you really want an impregnating type that you get enough in, so you can dip it. You can run a motor for crawling unbalanced and unepoxyed, but it will not run at its best.....it will run though.... The solder joint is gonna be really crappy too.....you guys don't have the right solder or flux....and 99.99% of the time, you don't even have an iron that gets hot enough.... I am gonna finish it up next week......but I am gonna have a full article on how an arm is wound by us from start to finish. Any questions, just PM me.... Later EddieO |
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05-21-2010, 07:13 PM
| #19 |
| Pebble Pounder Join Date: Oct 2009 Location: South Korea
Posts: 131
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I'm betting my 150w iron will get hot enough. Maybe I'm the .01% :p
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05-21-2010, 09:05 PM
| #20 |
| I wanna be Dave Join Date: Apr 2007 Location: Arlington, Washington
Posts: 2,303
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Well, I thought the same thing too....I had 100+ watt goot, thought for sure no problem with it.... Worked like crap....the key is a solid wattage but a huge tip. Everyone pretty much used the same Weller Iron. It was only about 75 watts or so if Memory serves correct, but was just this really big bulky thing. It transfered heat like crazy. I rarely solder any more, so I will pull it out and get the model number off it. Later EddieO |
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