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11-13-2008, 07:43 PM | #1 |
Rock Crawler Join Date: Jul 2008 Location: E. City
Posts: 883
| Really weird gearbox/motor problem
Ok so my problem is not about a Clodbuster or rock crawling but it is a problem that I think Clod guys would understand and maybe know why. I have a Tamiya Wild Dagger that I let kids drive when ever I go out driving. It has two seperate gearboxes with their own motor, just like Clods do. The gearboxes are not connected to each other in any way and the motors are completely seperate from each other. I just put in some cheap 17 turn motors yesterday and today I noticed something. I have the motors wired in parallel and diffs locked. I held the truck in the air and slowly rotated the back tires forward. There was more resistance than there should have been. I kept rotating trying to figure it out. I gave the back tire a quicker spin and then the front tires spun a little too. Keep in mind the gearboxes are seperate from each other so that shouldn't happen. I spun the front tires forward quickly and the back tires moved as well. I removed one motor spring and brush from the front motor and rotated the rear tires quickly again. This time everything felt normal and there was definatly less resistance than there was the first time. I reinstalled the brush and spring and the resistance was back. Having been in the hobby for 14 years I have never seen this happen before. Could the rear motor be producing current as I spin the tire causing enough juice to make the front motor spin a little? Is this right or could there be something wrong? |
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11-13-2008, 08:21 PM | #2 |
Pebble Pounder Join Date: Jan 2005 Location: Kirkville
Posts: 182
| Hi I have a clod and it dose the same thing,if you spin the front the rear turn know problem.Jim |
11-14-2008, 10:54 AM | #3 | |
Pebble Pounder Join Date: Oct 2006 Location: raleigh, nc
Posts: 135
| Quote:
On my crawler rig with two 55 turn motors it does this quite easily, on my other rig with 14 turn motors it is harder to do this. More motor winds create more power at lower rpms. | |
11-14-2008, 01:44 PM | #4 |
Quarry Creeper Join Date: Nov 2007 Location: Cincinnati
Posts: 401
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^^^like he said, when you turn one set of wheels the motor from that set generates a small current back to the other motor and causes it to slowly spin. it's not a problem.....it's normal.
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11-14-2008, 01:47 PM | #5 |
Rock Crawler Join Date: Jul 2008 Location: E. City
Posts: 883
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Hmm, well ok. I never noticed it before when I had the stock silver can Johnson motors in it. But why is there more resistance in the motor?
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11-14-2008, 06:32 PM | #6 |
Pebble Pounder Join Date: Dec 2007 Location: Canby, Oregon
Posts: 177
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By powering the other motor, its putting a load on the one your spinning. You can't have free energy man.
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11-14-2008, 10:04 PM | #7 |
Rock Crawler Join Date: Jul 2008 Location: E. City
Posts: 883
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Huh, well I guess you learn something new every day. Like I said I had never seen this before so I was a little confused. Thanks for the info.
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11-15-2008, 05:23 PM | #8 |
Quarry Creeper Join Date: Jan 2007 Location: Osaka, Japan
Posts: 425
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What they said. There is also a (much smaller) board devoted entirely to the Wild Dagger series here: http://rcdaggerweb.com/clyde/blogs/index.php in case you have any other issues related to that truck. Lots of good info there. -val |
11-15-2008, 05:45 PM | #9 |
Rock Stacker Join Date: May 2008 Location: milpitas, CA
Posts: 93
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also what he said, and if you spin it really fast it will lite up the speed controller |
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