Chapman GP7 Project

Re: Chapman GP7 Project

Postby dwyaneward » Sun Oct 09, 2016 5:17 pm

Brian,

You might try contacting this fellow, He provide me with motors for some N scale Atlas 4-6-2 a few years back. The motor I needed where not listed on his site, but he was able to get them.

http://www.micro-loco-motion.com/
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Re: Chapman GP7 Project

Postby ConnRiver » Sun Oct 09, 2016 7:02 pm

Did I confuse the Mashima motor numbers? I should be referring to 1220D, not 1020D?

Anyway, some online info that Mashima has gone out of business. Apparently, this announcement occurred in 2009, too. Murky situation, at best.
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Re: Chapman GP7 Project

Postby ConducTTor » Sun Oct 09, 2016 7:54 pm

I assume somene bought the failed business and kept going.
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Re: Chapman GP7 Project

Postby sd80mac » Sun Oct 09, 2016 11:53 pm

While browsing on AliExpress, I came across this motor:
https://www.aliexpress.com/item/12v-and-24V-Ndfeb-magnetic-carbon-brush-rotor-large-dc-motor-hm-ship-model-motor/32654622299.html

It's a 5-pole skew wound design running 13000RPM @ 12v. It may actually be the closest contender to the Mashima motor, for five to six times less!

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Re: Chapman GP7 Project

Postby krokodil » Mon Oct 10, 2016 2:39 am

Be carefull with this motor. They specify the voltage between 12-24 V. This means it may have low torque below 12V. Would be fine to test it or to get the real specs. It looks very good.
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Re: Chapman GP7 Project

Postby ConnRiver » Mon Oct 10, 2016 11:12 am

Yesterday, from AliExpress, I ordered 10 pcs of the Mitsumi M15N-3 motor. Had I known about this other motor, I would have added it to the order. Is it 12.7 mm wide? That's. 0.5 in., so it might just squeeze in between the hood walls. I wonder if a 0.010 in. space either side of the motor might cause the hood to vibrate and thus cause noise?

We'll have to accumulate various motors that seem suitable and give them all a workout.

Alex, I'm not sure what's going on with Mashima. I'm wary since the motors aren't available from "normal" sources. And, none in the United States? A couple of sites I located yesterday stated because of unavailability of magnets, Mashima was discontinuing certain lines. And, there's no word that I've found that Mashima will continue in business.
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Re: Chapman GP7 Project

Postby ConducTTor » Mon Oct 10, 2016 11:29 am

Hmmm, that's crappy...
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Re: Chapman GP7 Project

Postby krokodil » Mon Oct 10, 2016 11:37 am

I wonder if a 0.010 in. space either side of the motor might cause the hood to vibrate and thus cause noise?

I think the noise problem is just secondary. More questionable will be the heat generated by motor. If there is no air insulation ( gap between the motor and the hood) the plastic hood can be easily damaged.
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Re: Chapman GP7 Project

Postby ConnRiver » Mon Oct 10, 2016 11:41 am

krokodil wrote:I wonder if a 0.010 in. space either side of the motor might cause the hood to vibrate and thus cause noise?

I think the noise problem is just secondary. More questionable will be the heat generated by motor. If there is no air insulation ( gap between the motor and the hood) the plastic hood can be easily damaged.


That motor, then, is too wide, correct?

The M15N-3 is about 0.473 in. (12 mm) wide. Assuming a hood exterior 0.6 in. wide and .040 in. walls, that leaves 0.520 in. interior space. Or, about 0.023 in. either side of the M15N-3. Good enough? (Right now the 0.040 in. wall figure is just a guess.)
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Re: Chapman GP7 Project

Postby ConnRiver » Mon Oct 10, 2016 11:48 am

Alex, originally I assumed the Mashima 1224 motor and drew it first. You recommended against it. Somehow, I landed on the Mashima 1020 motor, but rather than the 1224, did you recommend the 1220 (and not the 1020)?
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