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#1
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Re: Motor Placement Pros and Cons
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There is no glaring reason against your idea. Most teams will center up the transmissions to balance the weight over each of the wheels. Your configuration may cause some steering instability as the wheels under the trans will have slightly more weight over them than the other wheels. The longer chain paths do have a little greater chance for problems as the loop developed as the chain stretches is more capable of throwing itself off a sprocket. There are ways to prevent that but they come at a cost of additional weight. No matter what you decide, plan on some device to take up the slack in the chain and check for slack before each match. Correct chain alignment is a must for efficient drive so make sure all your sprockets line up (in the same plane) before driving as well. Let us know how it worked. |
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#2
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Re: Motor Placement Pros and Cons
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#3
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Re: Motor Placement Pros and Cons
Wow you guys are fantastic! I really do appreciate the input. We will make the final decision on this tomorrow because school is out today. Its good to have as much information as possible before we make final decision - all this data helps so much.
One of the kids has another very valid question - Are there any teams out there that are using four transmission boxes (direct drive)? Is that legal to do? Pattie |
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#4
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Re: Motor Placement Pros and Cons
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#5
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Re: Motor Placement Pros and Cons
Well, we actually used this gearbox placement for the 2003 game. Yes, there were steering issues (we found it far easier to turn one way, but difficult to turn the other). I believe these were more of a result of other aspects of the drive train, ie. weight distribution and the wheelbase vs. distance between axles.
Regardless of where you place the gearboxes, if one corner of the robot has more weight on it, you will have steering/turning problems. I suggest that you find a way to make your wheelbase wider than the distance between axles, or use low-traction wheels on one end of your robot. -Mr. Van Coach, 599 |
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