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Grip with too much torque
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Hey, I'm building a very simple tug thing with two xl motors for drive. The goal is to create a very simple but powerful tug just to pull heavy stuff. By simple I mean so simple that it has no sort of aesthetic parts, no suspension, and not even steering. But I have a problem: too much torque and not enough grip. Is there a way to deal with this without reducing torque or adding weight?
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| January 10, 2014, 5:27 pm
If you're making it rear wheel drive, then you put as much of the weight as possible just in front of the drive wheels, if front wheel drive, I'd put it just behind them.
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| January 11, 2014, 11:23 am
 Group admin 
Quoting Robert B.


What are you using for drive? If you are using the rubber tires try to use the ones that have the most surface area in contact with the ground. Try the flat ones that are on the unimog. Also you could spray them with hair spray. A light coating would provide more grip on most surfaces.

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| May 25, 2015, 11:29 pm
Quoting George Staples

What are you using for drive? If you are using the rubber tires try to use the ones that have the most surface area in contact with the ground. Try the flat ones that are on the unimog. Also you could spray them with hair spray. A light coating would provide more grip on most surfaces.

I've converted the project into something else, which has a pretty silly problem of its own. It has two xl motors, one powering the front axle, one powering the rear axle. The problem I have is that the two motors, when they spin, spin in the wrog directions, meaning that the rear wheels spin the opposite direction to the front wheels. I've tried independently switching their polarity, but they switched back when I hooked them up together. The only solution that I can think of is to use two separate inputs for the motors, but I'd rather not do that if possible, as then I'd have to use two remotes.
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| June 25, 2015, 9:40 pm
 Group admin 
Quoting R .
I've converted the project into something else, which has a pretty silly problem of its own. It has two xl motors, one powering the front axle, one powering the rear axle. The problem I have is that the two motors, when they spin, spin in the wrog directions, meaning that the rear wheels spin the opposite direction to the front wheels. I've tried independently switching their polarity, but they switched back when I hooked them up together. The only solution that I can think of is to use two separate inputs for the motors, but I'd rather not do that if possible, as then I'd have to use two remotes.



A good pretty simple fix is to add a "reverser" gear to either the front or back axle, whichever is easier to build on. So it is basicly adding a gear of the same size as a gear next to it into your drive system, this reverses the drive direction, and it keeps the drive the same speed as the other axle.
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| June 26, 2015, 9:28 am
Quoting George Staples


A good pretty simple fix is to add a "reverser" gear to either the front or back axle, whichever is easier to build on. So it is basicly adding a gear of the same size as a gear next to it into your drive system, this reverses the drive direction, and it keeps the drive the same speed as the other axle.

The trouble is that the distance from the motor to the axle is very small, it's just a small axle that leads to some bevel gears. All of the actual gearing is done in the portal axles, but I'll try to figure something out.
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| June 26, 2015, 9:00 pm
Quoting R .
The trouble is that the distance from the motor to the axle is very small, it's just a small axle that leads to some bevel gears. All of the actual gearing is done in the portal axles, but I'll try to figure something out.

I'm not sure of the gear combination you're using, but if you can say that from above or below the drive gears look like a sideways letter "T" then you might be able to fix it by reversing the orientation of one set of gears. In other words, one has to be upside down of the other.
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| June 27, 2015, 10:49 am
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