Winding your own armature advice - Page 6 - HobbyTalk
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post #76 of 91 (permalink) Old 01-24-2011, 04:50 PM
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Hey guys, i just did my 1st arm this weekend. 3ft of 38, which got me 1.1ohms. But i belive i made a mistake. I was looking at my stock arms and noticed that where the wires are tied to the comm plate, i reversed them.

So does this mean that the motor will run backwards? Thus only be used in 4 gear cars?
Yes, if you secured them to the wrong lugs, the motor will run the opposite direction.....


JS

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post #77 of 91 (permalink) Old 01-24-2011, 06:07 PM
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Originally Posted by hrnts69 View Post
Hey guys, i just did my 1st arm this weekend. 3ft of 38, which got me 1.1ohms. But i belive i made a mistake. I was looking at my stock arms and noticed that where the wires are tied to the comm plate, i reversed them.

So does this mean that the motor will run backwards? Thus only be used in 4 gear cars?
The four gear just reversed the magnet position...if memory serves.

No reason you cant do the same.

Right?
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post #78 of 91 (permalink) Old 01-25-2011, 04:22 PM
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The four gear just reversed the magnet position...if memory serves.

No reason you cant do the same.

Right?
Correct Bill. Just gotta remember which car has the reversed mags!


Hey.......where's Dyno?? I'm still curious.........

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post #79 of 91 (permalink) Old 01-25-2011, 06:06 PM
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I would be winding as well, but I am too busy racin, showing the rear bumper of that new little rocket to the local crew. I have already heard several comments that their getting tired of seeing it. HA ha. Nothing like a new bullet in the stable.

Their all waiting on it to slow down or burn up, it gets faster every time out & is now running as cool as ice.

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post #80 of 91 (permalink) Old 01-25-2011, 11:14 PM
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I would be winding as well, but I am too busy racin, showing the rear bumper of that new little rocket to the local crew. I have already heard several comments that their getting tired of seeing it. HA ha. Nothing like a new bullet in the stable.

Their all waiting on it to slow down or burn up, it gets faster every time out & is now running as cool as ice.

Boosted
Awsome Jeff!! Glad to hear it........keep kickin' it out man!!

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post #81 of 91 (permalink) Old 01-26-2011, 12:21 AM
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hey boosted glad to hear it. told ya so. tell,em to get used to it!!!!
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post #82 of 91 (permalink) Old 01-26-2011, 08:23 AM
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Yep, I know who to call Tjetsgrig knows just a bit about armatures

Thanks, its a really fun car, wish you guys could hot lap it as well.

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post #83 of 91 (permalink) Old 01-26-2011, 01:48 PM
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Boosted,

Sent you a PM regarding your local racing.
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post #84 of 91 (permalink) Old 01-26-2011, 04:23 PM
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PM'd you back

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post #85 of 91 (permalink) Old 01-26-2011, 06:55 PM Thread Starter
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Hey.......where's Dyno?? I'm still curious.........
Im still dying for a chance to get to my second try but Ive been really busy with work, and shoveling snow, lol, also Ive been at a friends house helping him build a slot car motorsports complex. He is in the middle of wiring up a
16x4 four lane, and building a shelf for a drag strip, he also has another 16x3 table for an oval or whatever he has in his minds eye. I wish I had that much room to work with.

As soon as I get to it, success or failure, it will be posted here.
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post #86 of 91 (permalink) Old 02-02-2011, 05:42 PM
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Good Afternoon Everyone,

I finally got a bit of time to play with slot cars again and decided to do a refresher experiment on the magnetic field strength that is produced when a pole of an armature is energized. As you know, the armature pole is energized with an electrical current running through ( technically, on the surface of ) the wire wrapped around a material that is magnetizable, creating a magnetic field that is opposite to that of the permanent magnet the armature is rotating towards. These two opposite magnetic fields attract causing the armature to accelerate until it reaches itís maximum rpm.

What I wanted to do was to measure the strength of the magnetic field produced by various types; inline and pancake, and different winds; stock, Super II, and rewind. Following is the setup:

WrightWay 1/24th Power Supply, 0v to 11.75v DC, 0 to 10 amps

WrightWay ( Acello ) Gauss Meter, -1999g to 1999g,

All arms tested at 0.99 vDC. Reading in gauss for one pole.

All Electronics $0.50 slot car motor: 30 gauss ( This is a Mabuchi HT-50 type Can Motor )

Tomy Super G+ Armature: 62 gauss

Auto World T-Jet 500 Armature: 52 gauss

Aurora Blue Tip Drag Armature: 91 gauss

Aurora Super II Armature: 128 gauss

Own Rewind, 9.5 feet of 36 on a 2 lam Armature: 141 gauss

Some information for those of you who are thinking about rewinds. I know that the question was asked about the difference between the same ohm armatures but having different wire sizes. Itís all about which can carry the most current the most efficiently; the larger the wire the greater the current capacity the more work it can do. Maybe not in the way you want it to, but, that is where all the other factors of slot car racing come into play.

I needed to do this experiment to help me design a 12 ohm can motor for BRASCAR and scratchbuilding applications without needing to turn down the volts. Hopefully, in a few weeks Iíll have something to share.

Hereís a photo of some arms done back in the 70ís, the two on the right by me, the two on the left by Merril Rowe.

QLamarms.jpg

Be Good,

Keith VanAtta
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post #87 of 91 (permalink) Old 02-02-2011, 10:34 PM
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mr. vanatta i,m not an arm winder but i have seen some of yer stuff on the scratch building site. those arm look like candy and do appreciate the stuff you post. dont be a stranger. you do influence many wana be scratch builders .the above post is very interesting and i,m following this thread closely.maybe show more of yer stuff?
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post #88 of 91 (permalink) Old 02-10-2013, 08:14 PM
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Originally Posted by hrnts69 View Post
Hey guys, i just did my 1st arm this weekend. 3ft of 38, which got me 1.1ohms. But i belive i made a mistake. I was looking at my stock arms and noticed that where the wires are tied to the comm plate, i reversed them.

So does this mean that the motor will run backwards? Thus only be used in 4 gear cars?
Wow 3 ft i thought was like 9 ft each pole? Is that all
Thanks SJJ
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post #89 of 91 (permalink) Old 02-11-2013, 12:01 AM
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armature question

I just rewound 2 arms for my home track w/ wall warts(Tomy)1 of the arms is wound w/7ft.7in. of 39 ga.= about 4 1/2 ohms. The other arm is wound w/ 38 ga. about 11 ft. per pole=about 5 ohms.I'd think that the 38 ga. would be faster due to larger wire. The 38 ga. loses badly in to a super G+ ina 7 ft. straight from standing start.(same gearing) The 39 ga. gives the G+ a real run for it's money. The stock super G= has 172 turns of 38ga. vs. the 120 turns I used. I'm kinda new to this but am i missing something here? Larger wire=more volts=faster? Shouldn't lower ohm car be faster?I could use a few pointers here as i haven't even attempted this stuff since around 65-66!Also,timingtires &gearing are all the same.Thanks----jim
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post #90 of 91 (permalink) Old 02-11-2013, 01:54 PM
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More Power!!

Your wall warts probably don't have enough amperage for the 38. The 39 is happier with less power. If you have a long track without extra power taps, you may also notice the rewinds aren't as responsive on the far side of the track.
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