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#1
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Re: pic: what is cooking
Are you sure those spokes can take the torque of the final output, I'm no ME, but they look a little small to me. The big gears look about the same size throughout the gearbox, as do the little ones. So, lets say the little one looks about 12-15 tooth and the big ones look about 60. There look to be about 5 reductions, so I'm thinking a final output of 1.7-5.2 rpms. So, either turning swerve modules (seems a bit excessive) or some sort of arm? I might be a bit off on the tooth counts (hopefully not too far) but whatever the exact number is, that is one heck of a reduction.
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#2
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Re: pic: what is cooking
Judging by Luke's calc of final output RPM which sounds about right....im guessing a telescoping arm mechanism or other arm mechanism...looks very cool tho
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#3
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Re: pic: what is cooking
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#4
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Re: pic: what is cooking
Lukevanoort you were close the large gear is 70 teeth and the small gear is 12 teeth the final out put is 2.2 RPM
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#5
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Re: pic: what is cooking
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But how can you test something like that...the only thing I know of is COSMOS and that is only for solidworks. I really like the wight reduction designs though and if there are no torque problems that is an amazing gearbox. |
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#6
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Re: pic: what is cooking
Where are you counting a fifth reduction I count four... I had someone else look and they also only see four.
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#7
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Re: pic: what is cooking
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#8
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Re: pic: what is cooking
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Round holes will be faster to cut and stronger to boot. True, you will probably want your machinist to machine down the gears since they require balance; but the frame? -------------------------------------------------------------------------- What do you plan on doing with your telescoping arm anyways? Any cool off-season projects a-brewing? Nice work. |
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#9
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Re: pic: what is cooking
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#10
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Re: pic: what is cooking
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#11
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Re: pic: what is cooking
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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#12
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Re: pic: what is cooking
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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#13
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Re: pic: what is cooking
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#14
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Re: pic: what is cooking
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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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#15
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Re: pic: what is cooking
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![]() if it has that much strength than i need # 35 chain instead of # 25 Last edited by Jeff 801 : 28-07-2006 at 14:47. |
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