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Post by dave632 on Jan 11, 2021 17:15:24 GMT -7
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Post by skillet on Jan 13, 2021 21:15:55 GMT -7
Ok i took a walk on the wild side. Decided to give this winding a shot. I ordered two different wire sizes. 34awg and 38awg. I found that calculator to be misread for our use. I think it may read a single wire but when you wrap 3 poles and soldered the reading is different. I think its because of the total circle (all 3 poles in contact) is not being calculated. I think it was Robert I read said its close and fun but not accurate. Another thing is when you are finished and cut off the couple inches of wire your not at your exact measurements anymore. Probably don't mean alot but its something. My first shot was 20' of 34awg wire. Yha, that ain't going to fit. Way to fat. Round 2, was 8' of 38awg wire. Thinking I'd land around 6 ohm. To my surprise I found each pole to bounce between 3.6 and 3.7 . Actually surprised myself they all even measured not to mention measuring the same. Anyway after doing some thinking. Round 3, was 11' 6" of 38awg wire. After measuring, all 3 poles bounce between 5.3 and 5.4 ohm Final round, thinking about that little bit of wire left over I was cutting off. I figured I would try 11'5" of 38awg to see if the inch made a difference. After completing and measuring. All 3 poles measured a solid 5.3 ohm. I feel it made a difference. After doing some guess math the closest I can come up for on 38awg is for 2 feet on 3 poles trimmed and soldered should get you .9 ohm Its the closest number to 1ohm for easy math. These are my findings only to be shared, not as a this is. Mean while back at the ranch I have a pile of junk arms I plan on fixing. Am I able to use these in the races? Heck if I get comfortable making them I can send some in for prizes.      |
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Post by dave632 on Jan 14, 2021 8:28:12 GMT -7
I would not call winding your own arms fun but it is interesting. I like your winding tool. I made a motorized one but my counter did not work well so I have to count the winds. The reason your readings change when you solder the poles on is that you are reading the parallel resistance of all 3 poles since they are all attached. These arms will be allowed in unlimited classes. I will run an unlimited 3/4 gear class at my next race. Getting all the wire on the pole can be a trick. Stock 14-15 ohm pancakes have over 300 turns on each pole, I know because I counted them.  MVC-064S Arm winder |
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Post by Deleted on Jan 14, 2021 8:31:48 GMT -7
wonderful jig!
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Post by skillet on Jan 14, 2021 13:22:50 GMT -7
I'm going to rework my winder some. Yours is killer Dave. I also tried counting the turns but the wire kept snagging and breaking. I ended up just cutting it off. Any idea what the original wire size is on the arms? I thought 38awg was going to be thin ,but the wire I took off looks even thinner.
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Post by dave632 on Jan 14, 2021 14:08:43 GMT -7
I checked a red tip armature which reads about 14-15 ohms normally. The wire read .003 on my digital calipers which should correspond to #37-38. You may have one of the older armatures that use even smaller wire .002 on my calipers and read in the 16-20 ohm range. My guess would be around #40-42 for those. This is the counter setup I rigged up, it was erratic. The motor I used to drive the mechanism is a small one with a gearbox. It turns slow enough to allow winding. I have a different counter that I will have to figure out how to mount. I plan on winding some more sub 1 ohm armatures for the unlimited pancake class.  Rewinder armature side |
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Post by Eagle Racing on Jan 14, 2021 14:13:35 GMT -7
IMHO, just measure length instead of counting turns. Always write down what you do, wire size, length, timing, 2 lam, 3 lam or 4 lam. Right down what the ohm calculator says and note difference when you ohm motor after soldering.
Skillet mean green wire is 39awg 10ft of this should get around 6.3 ohm. The calculator will say around 8.32 ohm.
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Post by skillet on Jan 16, 2021 0:00:48 GMT -7
I like the measure wire way to. Thanks for the mean green info I put it the note book.
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Post by skillet on Mar 3, 2021 19:53:34 GMT -7
Here's some information I recorded during winding. In my chart it will show start length of wire. That's what I start with. Estimated wire length is about what's left when finished. Depending on how you tie your ends off will play part in how much gets cut off. After you solder the wire measure what's hanging wild. Minus that from start length to get your Estimated length. My Estimated length could be off 1/4 inch either way. I've tried two different kinds of wrapping. One will call a good wrap that takes forever. Good wrap you go slow and be carefully to put the wire right were you would think it go.The second will call sloppy wrap. Sloppy is just winding away trying to stay evenly side to side best as possible and just get it over with. One thing I noticed is the good wrap will ohm a little lower compared to sloppy wrap with the same length wire. Also when you go to balance them the good wrap is almost already balanced.  |
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Post by Eagle Racing on Mar 4, 2021 5:19:05 GMT -7
Here is a 4Lam armature that I am winding for a racer. The motor will have plenty of power. The real trick is getting it to the track.
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Post by skillet on Mar 4, 2021 12:50:55 GMT -7
Awesome Robert. I'm going to play around with some 34awg today and see what I come up with
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Post by Eagle Racing on Mar 5, 2021 6:13:59 GMT -7
Couple Of Armatures For The Unlimited Class Ain't They Pretty
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Post by gnome on Mar 5, 2021 6:27:06 GMT -7
Couple Of Armatures For The Unlimited Class Ain't They Pretty
those are supper nice what size wire did you use and what did they ohm at |
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Post by Eagle Racing on Mar 6, 2021 9:45:53 GMT -7
Couple Of Armatures For The Unlimited Class Ain't They Pretty
those are supper nice what size wire did you use and what did they ohm at The armatures ohm out at 2.5 ohm, I used 36 gauge wire on these. |
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Post by dave632 on May 9, 2021 13:39:41 GMT -7
I have one of Eagles armatures that will be running in Unlimited at the Spring Nationals and it runs good, I will let all know what car it's in then. I will have some of my own winds in the mix also and will pass on which cars they are in. I also bought one of these manual winders off E bay. Looks like someone made it themselves but works good and they did a nice job of construction.  Arm winder |
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