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#1
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pic: FRC488 2007 Robot
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#2
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Re: pic: FRC488 2007 Robot
Nice!
Some questions: -what material are you using for the top of your platforms? -what is the angle of those ramps? -how much does each "wing" weigh? Looking good! |
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#3
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Re: pic: FRC488 2007 Robot
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The ramps are angled at approximately 30* -- and there will also be similar ramps on at least one more side per lift. That may seem to be steep compared to a lot of ramp robots, but the overall height of the ramp is only about 2", so we anticipate most robots ought to be able to clear it with little trouble. Each 'wing' is weighs entirely too much. If I conservatively overestimate, as the models are missing hardware, I'd say they're about 30 lbs. each right now. They're heavier than we anticipated because the first iteration of the design buckled the rectangular aluminum tubing when we tested it to a safety factor of two. I'll be able to iteratively remove material from the lifts after they're assembled and we're able to better test how well they handle stress. |
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#4
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Re: pic: FRC488 2007 Robot
the teams that drive the long way (38") will not ba able to fit on that ramp though? and if you are relying on them turning they may fall off. i could be looking at this wrong so please help me to better understand your very nice design.
Last edited by Dylan Gramlich : 30-01-2007 at 17:07. |
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#5
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Re: pic: FRC488 2007 Robot
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Last edited by Madison : 30-01-2007 at 17:15. |
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#6
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Re: pic: FRC488 2007 Robot
sry changed my question. i got the concept after i re-read the post.
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#7
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Re: pic: FRC488 2007 Robot
Have you considered adding "ramps" to the outside edges of the platform, allowing teams to approach and climb then from angles (also allowing wider robots a chance to get on)?
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#8
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Re: pic: FRC488 2007 Robot
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#9
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Re: pic: FRC488 2007 Robot
I'm very interested in your lift mechanisms there under the ramps. What do you use to power them? Looks very intriguing though, one of the more creative designs I have seen thus far. Nice looking model.
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#10
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Re: pic: FRC488 2007 Robot
The lifts are each comprised of two four bar linkages. Each linkage is driven by a 125 lbf. gas spring that is held closed by a mechanism that's not shown -- it, too, was a fatality of the recent redesign. The gas springs allow the lifting to occur without the need for power or stored air -- so we feel that it should be a reliable mechanism for lifting robots at the last possible moment. Also, we like that the gas springs of the same extension are available in different values of output force, so if we find that 250 lbs. per side is too much or too little force, we can change it quickly and easily.
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#11
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Re: pic: FRC488 2007 Robot
I like! My team was theorizing of something like that. Only second complete Inventor design/photo I've seen of a robot with no ringer capacity (as far as I can tell). Although, it appears to me like you've got a good, steady lifting design that (correct me if I'm wrong) can lift to 12", giving you a guaranteed 60 points, which is very valuable, IMHO. Very nice overall.
Can you shed some light onto what the two small protrusions at the bottom (picture-wise, top right) of the robot are? They look almost like tower supports, but in the bottom right head-on view, there's no tower. Can you describe what they are? It's interesting to me that for a (I assume) defensive robot you chose the omnis with powered middle wheels. From what I've heard, you could get turned around your axis pretty easily. Did you choose to put two motors to each side to counteract it? Nice design overall. |
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#12
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Re: pic: FRC488 2007 Robot
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