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#31
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Re: Minibot climb rate
You're right, the update only says motor and battery are required; it doesn't say controller although it says "appropriate circuitry", so what would that be other than through the controller? You can't follow the robot electrical rules and direct wire it because that would require the power panel and fuses which aren't on the allowable material list. So I still need those weights.
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#32
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Re: Minibot climb rate
Quote:
I expect great things from the Q&A. Terrible, yes, but great. |
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#33
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Re: Minibot climb rate
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I'm even more convinced now, that the real challenge with the minibot is your deployment system. I have a feeling that at competition, we'll see some great minibots, but not as many great deployment systems. |
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#34
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Re: Minibot climb rate
I couldn't agree more!
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#35
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Re: Minibot climb rate
Correct me if I am wrong but isn't it possible to use the Tetrix continuous rotation servos in addition to (or instead of) the allowed motors per rule <R92> A?
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#36
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Where do you order these kits. We have never done anything with FTC. It is a stretch for us to do FRC. This is a challenge we have. Where do I order the 2010 FTC Base Kit. I looked on line but all are Back ordered. Where have you bought these from. Thanks
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#37
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Re: Minibot climb rate
For the original question:
Last night we weighed 2 minibot motors, 2 minibot motor mounts, the FTC battery, 1 TETRIX 18" Rail, and (2) 4" wheels. Total weight was between 4 & 4.5 lbs (scale only does 0.5-lb increments, but rounds up). I will note that we do not plan to use the NXT or the motor controllers. We cannot find specs regarding the NXT's shock rating. Without that data, and given the open-field nature of this year's game, we will not put a $200 device on the bot and call it "reliable". Last edited by JesseK : 12-01-2011 at 13:15. |
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#38
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Re: Minibot climb rate
I just received my (free, with hundreds left in stock - I will not be providing details [again] - search for it - I feel like Gary and Eric now) FIRST Choice FTC Mini Kit. Rushing (imagine me doing that) back to one of our labs, I measured the following weights for the FTC DC motor and battery pack:
Motor: 210.35 g Battery Pack: 599.69 g What are these strange Copiolian measurements of which I speak? Motor: 0.464 lb. Battery Pack: 1.322 lb. Quote:
Last edited by Travis Hoffman : 12-01-2011 at 13:41. |
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#39
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Re: Minibot climb rate
ALL RIGHT! Travis is the go-to guy for FTC questions
A couple quick ones - Weight of the wheels? Thickness of the gears? (and weight, but I can calculate close enough) Verify 32 diametral pitch on the gears (is the 120 tooth gear 3.75 PD?) Thanks |
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#40
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Re: Minibot climb rate
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Did you know that the gears were "Assembled in USA"? Probably the reason behind the cost.... Go go gadget globalization. Mr. Ruler sez that the 120 tooth gear's PD is 3.75", and its thickness is 0.25"-ish. Mr. Scale sez that the 120 tooth gear weighs 114.71 g / 0.25 lb. (in its thin plastic packaging - didn't want to mess up the shiny finish). Mr. Scale also sez that the 4" wheel weighs 117.24 g / 0.26 lb. Last edited by Travis Hoffman : 12-01-2011 at 14:05. |
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#41
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Re: Minibot climb rate
Quote:
They have a bore of 8mm with four 3.5mm holes on a 16mm bolt circle. There are also eight 8mm holes on a ~59.58mm bolt circle. I think these are decorative. ![]() I can corroborate Travis' weight measurements. |
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#42
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Re: Minibot climb rate
Quote:
By extrapolation I'm guessing the 80 tooth gear is 76.47 g. Last edited by billbo911 : 12-01-2011 at 15:00. |
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#43
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Re: Minibot climb rate
Quote:
Is your math right? Gears are same thickness and have the same number/size of holes. 120T area = pi * ([120/32] / 2) ^ 2 = 11.045 sq. in. 80T area = pi * ([80/32] / 2) ^ 2 = 4.91 sq. in. Density Ratio = 0.444 80T Weight estimate = 0.444 * 114.71 = 50.93 g Last edited by Travis Hoffman : 12-01-2011 at 16:43. |
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#44
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Re: Minibot climb rate
Quote:
Quote:
(Team Update 1 changed A to read "A. TETRIX components that are not in violation of any other rules", and B is an other rule) |
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#45
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Re: Minibot climb rate
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From the robot rules - "An unlimited number of limit switches and two ordinary household light switches." is allowed on the minibot. So it is possible to create a "computer" that has a hardwired program to perform the necessary algorithms for machine control. After all Von Neumann said that hardware and software was equivalent ! Really.. He did ! . |
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