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Thanks to ASRC Aerospace we can get this cut out on the wire edm that they have, either that or the water jet.... The machining ability that we have gained is amazing! I have looked over some of the stress factors and I think it should work because it is ¼” thick plate for the sidewalls. I would like to commend Jeffery on his skills considering he is only in 8th grade but has mastered inventor and has the ability to think in a mechanical nature will be a great asset to the team.
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I'd be more concerned about the strength of the gear teeth, especially in the later stages...if you take a CIM down to 2.2 rpm...you're going to be multiplying the max torque you can exert (it'll be around 90-100 oz-in when you trip the 40 A breaker) and if your free rpm is 2.2 rpm...then your gear ratio is somewhere around 2400...
240000 oz-in is a LOT of torque. be absolutely sure your gears can take it...you may have to step up the pitch a bit but i totally agree...that amount of engineering proficiency and gumption in an 8th grader has the potential to be amazing...i look forward to future work. |
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wait...8th grader...thats amazing :ahh: :ahh: :ahh: :yikes: wow thats really food, i was thinking you were a veteran senior...Your team is really lucky to have you :)
Keep up the good work |
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I know there are people out here that would do a much better job of explaining this than I would, but rest assured, you can do a good job by hand calcs. One of those things you learn in school. |
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free speed of around 2500 rpm down to 2.2...gear ratio of 1136...at your max current of 40 A, then that's 1136*240 oz-in = 272700ish oz-in, and then considering dynamic loading you need to multiply that by at least a factor of 2 for safety one would think. 550000 oz-in is a pretty hefty requirement. Although, to be honest you will probably never ever ever see anything in FIRST that requires that sort of reduction to do something. Unless next year's game is pick up an elephant and hang your robot on the bar carrying the elephant...which WOULD be pretty sweet to see aside from animal rights issues... Also consider that every mesh you make decreases efficiency by a few percent. Just things to keep in mind. :) Keep up the good work. |
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if it has that much strength than i need # 35 chain instead of # 25 |
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