03-28-2009, 02:43 PM | #81 |
RCC Addict Join Date: Jan 2008 Location: Lake Michigan
Posts: 1,898
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Hey Jbugman, What about these 390 motor on the Banebot site http://banebots.com/pc/MOTOR-BRUSH/M5-RS390-12 18oz of torque is about 2/3 of a silvercan 27T 540. Little fast at 12v, so what about 6-7cells. 7000RPM, but wait for the 9/10T pinion from Korea (another thread). Wonder what the torque is on 6cells? |
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03-28-2009, 04:23 PM | #82 | |
Rock Stacker Join Date: Mar 2009 Location: Titusville
Posts: 83
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03-30-2009, 08:37 PM | #83 | |
RCC Addict Join Date: Jan 2008 Location: Lake Michigan
Posts: 1,898
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Are those 400 cobalts really only 38mm long on the body? Are they 3pole or 5pole? thx | |
03-31-2009, 04:47 PM | #84 |
Quarry Creeper Join Date: Mar 2009 Location: north central IN
Posts: 264
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Glad you guys are working on this, wish I could help but my electronic knowledge is limited. Sounds like you've almost got it figured out. Keep the updates coming. |
03-31-2009, 04:56 PM | #85 |
I wanna be Dave Join Date: May 2006 Location: HONDURAS...ROCK HEAVEN
Posts: 5,076
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Has any of you compared to a holme's 454 motor?, are these any torquier? i will finally try my 454 on thursday when my novak pinion come in.
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03-31-2009, 09:11 PM | #86 |
RCC Addict Join Date: Jan 2008 Location: Lake Michigan
Posts: 1,898
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Crap, the first Promax 3745 370 motor I wound 140T is working great. Second one crapped in 5 mins., with a loose wire. Rewound it again tonight, and it runs slower, and gets noticably hot in about 10-15secs and then slows down more. The first one has OK torque, and decent wheel speed on 12v. With 9T pinions it would be about it for me. Cannot put my finger on this second motors problem. Tried all sorts of timing adjustments. Cleaned the brushes. Notta. |
03-31-2009, 11:14 PM | #87 | |
Rock Stacker Join Date: Mar 2009 Location: Titusville
Posts: 83
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As soon as get new pinions, I will resume testing. I just got my daughter's CC prebuilt in today (4th birthday and she said she wanted barbie dolls and a rock crawler) and tried out my 110 turn motors on 7.2V. They stall a little, but they were going pretty well. Speed is just right. Torque is pretty good, much better than stock. The way she drives my wife's MRC, I knew she wouldn't be satisfied with the stock motors or servos, either. I am even painting it "Princess Pink", a mix of rasberry pearl and faschange purple. I think those long can 400's may be just right on 7.2V, and I will find out when I get my pinions. Last edited by spartacus_nuc; 03-31-2009 at 11:15 PM. Reason: grammatical error | |
04-01-2009, 04:29 AM | #88 | |
RCC Addict Join Date: Jan 2008 Location: Lake Michigan
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Has a raised bump on the endbell, but nothing on the can anywhere. I trial and errored the first motor and must have hit it right on. I am going to try and swap rotors between cans, then endbells. See what the problem follows. But I smell a third rewrap coming. It will all have to wait. Busy week (three kids), and pre packing to take the kids to visit the grandparents in Arkansas. Not all bad though. Wife limiting kids and I to taking 2 trucks, as the grandparents have decent rocks on their prop. | |
04-01-2009, 09:14 AM | #89 |
RCC Addict Join Date: Jan 2008 Location: Lake Michigan
Posts: 1,898
| 180/280 gearmotors
So what about small gearmotors? Like this Pololu robot 180/280 w/25:1 gearbox. http://www.pololu.com/catalog/product/1092/specs It puts out 40oz of torque at 6v. Isn't that as much as (or slightly more then) a 540 silver can stock 27T? 44mm long assembly. Notes say they can be run up to 9v also. Is it overworking this little guy? |
04-01-2009, 10:07 AM | #90 |
~THE SCALE SHOP~ Join Date: Apr 2006 Location: KILLEEN TX
Posts: 10,056
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i dont think going to a smaller motor is the answer, and with all that reduction its gonna be mega slow to make the same torque as what were all testing now.
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04-01-2009, 10:16 AM | #91 | |
Rock Crawler Join Date: Nov 2005 Location: Rock-throwing country
Posts: 847
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http://www.anaheimautomation.com/bru...ear-motor.aspx Edit: rpms look too low on most of these. Searched around there site and found this http://www.anaheimautomation.com/man...7%20Series.pdf Might be of interest on 3 or 4 cell lipo Last edited by Mr Glassman; 04-01-2009 at 10:33 AM. | |
04-01-2009, 01:40 PM | #92 | |
RCC Addict Join Date: Jan 2008 Location: Lake Michigan
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400rpm = 6.67 Revs per sec Run that through the +/-28:1 ratio of the stock axle and you get 0.238 revs per sec of the wheel. 2 x PI x r = circumference of the tire = 2 x 3.14 x 2.3 = 14.44 How far you would travel on a flat would be 14.44 x 0.238 = 3.44 inches per second. That is at 6v, and they claim that motor can handle up to 9v. RPM at 9v would be a third higher yet. And additional torque also. I agree the motor seems small, but its spins at 12,500 before its geared down. I just don't know when it's loaded up, will it burn up the brushes or other? | |
04-01-2009, 01:59 PM | #93 |
~THE SCALE SHOP~ Join Date: Apr 2006 Location: KILLEEN TX
Posts: 10,056
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agreed, not designed for high amp draws. i just dont think going smaller is our answer, its our problem, not the solution that motor will just be too slow. |
04-01-2009, 09:57 PM | #94 |
Rock Crawler Join Date: Aug 2008 Location: Tucson
Posts: 625
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With the abundance of electric motors in the world today, I find it hard to believe that people have to resort to wiring their own to get the desired performance. There has to be an easier way. Either that or shame on Duratrax, shame shame!
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04-01-2009, 10:27 PM | #95 |
Rock Stacker Join Date: Mar 2009 Location: Titusville
Posts: 83
| Yes, shame on duratrax! If they only increased the gear ratio by a factor on 2, the stock motors would have been perfect.
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04-01-2009, 11:12 PM | #96 |
Quarry Creeper Join Date: Mar 2009 Location: north central IN
Posts: 264
| I'm surprised a company hasn't built a pinion to work. If that would make as big of a difference as I'm sure it would they could sell lots.
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04-02-2009, 10:41 PM | #97 |
Rock Stacker Join Date: Mar 2009 Location: Titusville
Posts: 83
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0.6 module is kind of an oddball pitch, and even if someone made a smaller pinion, 9T is probably the smallest pinion that will work on the cc, and even that will require some trimming. 11T-13T is designed range of pinions with 380 sized motors. I just got my new pinions in, and will be hammering some new motor winds on the rocks this weekend. I really want to push those long can 400's till they cry and see what they are capable of with a pinion that isn't spinning on the shaft. Maybe if we all emailed Duratrax and asked for revised 'crawler specific gearing' for the cc, they would consider making something available.
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04-03-2009, 07:12 AM | #98 |
RCC Addict Join Date: Oct 2008 Location: Plainfield, IL.
Posts: 1,297
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Is anyone going to try mounting 540's like that other guy did?
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04-03-2009, 09:05 AM | #99 |
~THE SCALE SHOP~ Join Date: Apr 2006 Location: KILLEEN TX
Posts: 10,056
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pics? link? i havent seen any one mount up 540s....
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04-03-2009, 09:24 AM | #100 |
RCC Addict Join Date: Oct 2008 Location: Plainfield, IL.
Posts: 1,297
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