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-   -   Minibot climb rate (http://www.chiefdelphi.com/forums/showthread.php?t=88680)

zbanks 12-01-2011 22:29
Re: Minibot climb rate
 
Light switch also seems vague.

http://www.google.com/imgres?imgurl=... t:429,r:7,s:0

http://t3.gstatic.com/images?q=tbn:A...ZNCpHRGzXlZwFe

The latter seems more useful, but seems less "standard." How much can we take the switch apart? If all we need is the mechanism, can we tear away at the innards?

Kevin Sevcik 12-01-2011 23:28
Re: Minibot climb rate
 
You haven't even approached non-standard light switches. I'm busy pondering whether they think three way light switches are "common" or not. Cause it sure would be nice to reverse those motors.

billbo911 13-01-2011 00:24
Re: Minibot climb rate
 
Quote:
Originally Posted by Travis Hoffman (Post 998273)
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
Fat finger on the calculater some where. Yours looks accurate..
Thank!

Travis Hoffman 13-01-2011 04:11
Re: Minibot climb rate
 
Quote:
Originally Posted by billbo911 (Post 998786)
Fat finger on the calculater some where. Yours looks accurate..
Thank!
80T Weight = 46.00 g (in packaging) - checked last night

Gary Dillard 13-01-2011 07:41
Re: Minibot climb rate
 
Quote:
Originally Posted by ebarker (Post 998661)
A computer is nothing more than an arrangement of switches. It can be mathematically proven that if you properly arrange switches, you can build memories, arithmetic logic units, registers, and many more things needed to build a modern computer. That is why you see binary, or base 2 arithmetic in computers. It is their native language.

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 !

.
If you can do that within the 12 pound weight limit using limit switches and two light switches, I'll bow to you in honor.

jblay 14-01-2011 00:33
Re: Minibot climb rate
 
Quote:
Originally Posted by Kevin Sevcik (Post 998754)
Cause it sure would be nice to reverse those motors.
why would you want to be able to run them backwards?

JB987 14-01-2011 01:20
Re: Minibot climb rate
 
Quote:
Originally Posted by jblay (Post 999685)
why would you want to be able to run them backwards?
Makes for easy/gentle retrieval if you allow your robot to climb back down to the base to patiently await you!

Kevin Sevcik 14-01-2011 09:59
Re: Minibot climb rate
 
Quote:
Originally Posted by jblay (Post 999685)
why would you want to be able to run them backwards?
What JB said. If I can put a lightweight system on there to reverse the motors, I don't have to put on a robust retrieval system. Nor do we have to cart a reachin' stick out on the field after every match to get our minibot down. Mind you, we don't have our kit yet. The motors might backdrive quick enough that opening the circuit is adequate. I'd just like to keep my options open.

jblay 14-01-2011 12:49
Re: Minibot climb rate
 
Quote:
Originally Posted by Kevin Sevcik (Post 999825)
What JB said. If I can put a lightweight system on there to reverse the motors, I don't have to put on a robust retrieval system. Nor do we have to cart a reachin' stick out on the field after every match to get our minibot down. Mind you, we don't have our kit yet. The motors might backdrive quick enough that opening the circuit is adequate. I'd just like to keep my options open.
The top of the pole is 122 inches off the ground. your mini bot is twelve inches so the bottom of your minibot is 112 inches off the ground. the cylinder is 12 inches off the ground so if you stand on it you only need to reach 100 inches in the air or 8 feet 4 inches. so long as you have someone on your driveteam than can reach that high you will be fine.

JesseK 14-01-2011 13:23
Re: Minibot climb rate
 
Quote:
Originally Posted by jblay (Post 999961)
The top of the pole is 122 inches off the ground. your mini bot is twelve inches so the bottom of your minibot is 112 inches off the ground. the cylinder is 12 inches off the ground so if you stand on it you only need to reach 100 inches in the air or 8 feet 4 inches. so long as you have someone on your driveteam than can reach that high you will be fine.
I'm not so sure they'll allow us to stand on the base to get the MINIBOTS down. Interesting nonetheless.

Mark McLeod 14-01-2011 14:16
Re: Minibot climb rate
 
Quote:
Originally Posted by JesseK (Post 999986)
I'm not so sure they'll allow us to stand on the base to get the MINIBOTS down. Interesting nonetheless.
You don't think the Field Staff will be using them as benches during long timeouts?

mechE131 14-01-2011 14:16
Re: Minibot climb rate
 
Quote:
Originally Posted by JesseK (Post 999986)
I'm not so sure they'll allow us to stand on the base to get the MINIBOTS down. Interesting nonetheless.
Yeah, standing on the base will probably get a team member a good dope slap from a ref.

AndrewMcRadical 14-01-2011 15:06
Re: Minibot climb rate
 
Quote:
Originally Posted by Kevin Sevcik (Post 999825)
What JB said. If I can put a lightweight system on there to reverse the motors, I don't have to put on a robust retrieval system. Nor do we have to cart a reachin' stick out on the field after every match to get our minibot down. Mind you, we don't have our kit yet. The motors might backdrive quick enough that opening the circuit is adequate. I'd just like to keep my options open.
Coming from someone who is also on an FTC team, if you build your minibot light enough to be competitive(~5lb), I doubt the motors will backdrive at all.

vamfun 16-01-2011 15:44
Re: Minibot climb rate
 
Quote:
Originally Posted by JesseK (Post 996832)
I applied the equations in this whitepaper to JVN's Calculator (with some other mods as well) last night and came up with some interesting calculations.
In case anyone is interested, I posted my modification of this program for the Minibot climb here.

Added the FTC motor specs, some efficiency losses and Normal force effects.

Robodox 599 Numerology 3x3x3x3x3.3 minibot @ .8 efficiency

(wheel_dia_in) x (gear_ratio) x (time_to_climb) x (speed_fps)x(weight_lbs) :)

DonRotolo 16-01-2011 23:16
Re: Minibot climb rate
 
Quote:
Originally Posted by Kevin Sevcik (Post 998754)
You haven't even approached non-standard light switches. I'm busy pondering whether they think three way light switches are "common" or not. Cause it sure would be nice to reverse those motors.
Q&A defined 'light switches' at the kind you'd find at Home Depot or Lowes,. meant to switch lights in the house on or off,, and mounted in a standard wall electrical box.

My house has several 3-way switches so mounted, I bought them at Lowes, so they're OK to use.


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