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pic: 1726 week 4
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Re: pic: 1726 week 4
Very cool looking, I like the chain system on it.
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Re: pic: 1726 week 4
You beat us on the chassis weight, we were 70-75!
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Re: pic: 1726 week 4
Why not use two idlers rather than the curved plastic? It'd be a lot more efficient.
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Re: pic: 1726 week 4
The green plastic is our tensioner. The hole is off center, so we just loosen it and rotate it to tension the chain.
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Re: pic: 1726 week 4
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Re: pic: 1726 week 4
I'd say the efficiency loss due to friction on the plastic is minimal and worth the benefit of not having to make very precise holes for idlers. As a general team moto the less machining the better.
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Re: pic: 1726 week 4
Why the AL frame. You're using poltrusion below. Why not continue with the uper frame?
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Re: pic: 1726 week 4
The Al is for mounting the mechanism on it--it save weight (lots) and is easier to machine than pultrusion. Pultrusion must also be thicker to achieve the same strength as aluminum so it would be unwieldy to mount that way.
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Re: pic: 1726 week 4
or, the short answer: we had the pultruded fiberglass channel for the frame already, but no thin angle, so we went with aluminum. Also the aluminum is available at Ace hardware, and easy to replace if it we have problems with it in competition.
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Re: pic: 1726 week 4
our bot is so cool
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Re: pic: 1726 week 4
We like to play around with different materials, finding the best material for each part, kind of as an engineering exercise. A lot of that has to do with the equipment we have available in the shop, time needed to order materials and build parts, as well as the loading on each part. I think fiberglass is really excellent for frames, but it is a bit more tricky to use it in the upper parts of the robot, and we haven't gotten good enough at designing with it yet to feel confident using it there.
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Re: pic: 1726 week 4
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