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#1
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Re: pic: 3 Hour Drivetrain
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Thanks for the advice, I'll implement as much as I can tomorrow. Extending the supports sounds like a good idea. |
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#2
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Re: pic: 3 Hour Drivetrain
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If possible down-gauge the 3/16 to 1/8. It's an instant 33% weight reduction. If you actually make this, DO NOT CUT LIGHTENING HOLES ON THE FIRST BUILD PLATE!!! It's rather difficult to mount a random plate for something if there's a big triangular hole right where you need to put a bolt. That was another mistake I made. As for the wheels, I think they have to have some rock to turn in this configuration. |
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#3
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Re: pic: 3 Hour Drivetrain
This is good advice, and if you get a couple of those extrusion supports to go all the way to the outer rail, you should have no problems at all with strength.
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#4
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Re: pic: 3 Hour Drivetrain
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My team tried a simple 4WD with tracion wheels on all four axles, and that they hopped. Without a dropped middle wheel, your problem would be significantly worse. |
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#5
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Re: pic: 3 Hour Drivetrain
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I would also suggest you use some triangular bracing (look http://www.chiefdelphi.com/media/photos/31597 for an example) The cross members look like 1/8", how big are they? I would use 1/16" 1x1 and not lighten it. Be prepared to change the tread on those back wheels a lot. with the battery and 4 cims back there your CG should be behind your middle wheel. I like it. |
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#6
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Re: pic: 3 Hour Drivetrain
IMHO getting your rotational inertia as low as possible would be a good thing. I assume maneuverability is very important to you if you're aiming for 12FPS top speed, and getting the most massive components towards the center axle (which should be dropped) would improve the responsiveness of the robot.
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#7
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Re: pic: 3 Hour Drivetrain
Really? That's interesting. In essence, is the point of contact between the ground and one of the wheels lower than the others or is it not dropped at all?
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