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  #91   Spotlight this post!  
Unread 20-01-2011, 14:31
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Re: Minibot climb rate

Quote:
Originally Posted by JesseK View Post
I'm calling shenanigans on a minibot under 3 seconds. Reliably deploying and shutting off while making the climb in under 3.5 seconds is even improbable @ 14V, perfect peak power, and the minimum 3.5lbs it takes for the battery, motors, switches, [custom] wheels, and just 1 ft. of attachment structure held together with magic (or rivets...).
3 seconds is doable. I don't think Frenchie is implying that the deployment time is included in their claim.
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Unread 20-01-2011, 15:11
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Re: Minibot climb rate

Is the mini bot allowed to have springs on it
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Unread 20-01-2011, 15:17
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Re: Minibot climb rate

We just got 2.93 seconds with our mini bot...in heavy mode. We haven't even started shaving weight off.
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Unread 20-01-2011, 15:28
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Re: Minibot climb rate

our minibot is going up in about 2.8 seconds. Not including deployment time, so it is doable, but deployment is where the race will be won.
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Unread 20-01-2011, 16:40
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Re: Minibot climb rate

theres no springs allowed on the minibot or for deployment--team update #1 said no stored energy in deployment.
and how did you ever get it in under 3 seconds if not with a spring/launcher thing??
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Unread 20-01-2011, 16:48
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Re: Minibot climb rate

Quote:
Originally Posted by JesseK View Post
I'm calling shenanigans on a minibot under 3 seconds. Reliably deploying and shutting off while making the climb in under 3.5 seconds is even improbable @ 14V, perfect peak power, and the minimum 3.5lbs it takes for the battery, motors, switches, [custom] wheels, and just 1 ft. of attachment structure held together with magic (or rivets...).
The TETRIX motors are actually about 16W at peak power, not 8.43W as the spec sheet suggests. Surprisingly fast times are feasible.
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Unread 20-01-2011, 17:06
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Re: Minibot climb rate

Getting similar times on direct drive prototypes and 2-1 gear ratio prototypes... we are assuming similar times is due to gearing inefficiency and the added weight of all the extra gears, spacers, etc... The question is, how much better can we expect if we lighten up the Tetrix gears and improve gear alignment???
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Unread 20-01-2011, 17:31
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Re: Minibot climb rate

Quote:
Originally Posted by JB987 View Post
Getting similar times on direct drive prototypes and 2-1 gear ratio prototypes... we are assuming similar times is due to gearing inefficiency and the added weight of all the extra gears, spacers, etc... The question is, how much better can we expect if we lighten up the Tetrix gears and improve gear alignment???
Strictly based on calculations and the specifications available, the difference in times when directly driven and when a 1:2 gearing increase is added is only 1 second.

The calculation with the gearing did not include the additional weight of the extra hardware and gears requires to add the gears.
When I calculated with the weight added, I only see a difference of .8 seconds.

Therefore, I am not surprised in the least that your times are very close. Add in a factor of human error if manually timing, and you could easily have a dead heat.

So, would lightening the hardware help? You bet!
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Last edited by billbo911 : 20-01-2011 at 17:38.
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Unread 20-01-2011, 18:17
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Re: Minibot climb rate

I know this is a bit off topic but what size wire do you happen to use for wiring the motors?

thanks
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Unread 20-01-2011, 18:24
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Re: Minibot climb rate

So... we saw smoke when we made our bare bones minibot try to climb, with a modest overgear (0.5:1). These things can't be stalled for even a half second, apparently? I have no idea what smoked or whether or not the motors still worked, but if the motors are that delicate...
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Unread 20-01-2011, 21:04
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Re: Minibot climb rate

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Originally Posted by Chris is me View Post
Surgical tubing that does not contribute to the vertical motion of the robot is allowed. The best exampe I can think of is a surgical tubing tied gate latch.
Does rule include using surgical tubing as a drive belt and a friction surface on the wheel?
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Unread 20-01-2011, 21:51
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Re: Minibot climb rate

Quote:
Originally Posted by Chris is me View Post
So... we saw smoke when we made our bare bones minibot try to climb, with a modest overgear (0.5:1). These things can't be stalled for even a half second, apparently? I have no idea what smoked or whether or not the motors still worked, but if the motors are that delicate...
We smoked a motor hitting the top of the pole and not shutting off...probably a maximum of about 3 seconds of full voltage on a jammed motor.

This happened on the very first occurrence.

My suggestion is make sure you put in the motor cutoffs at the end of the race or make sure your wheel contacts are slippery enough to keep that motor turning.

I'm glad we ordered two extra motors. I expect many teams will fry motors before getting a working minibot.

---

BTW, our prototype uses solder on the motor contacts and uses standard tab and receptacle electrical connectors- not wire nuts.

If they didn't want us to use solder, then it would have been nice for them to supply Tetrix "DC Motor power cables". http://www.legoeducation.us/store/detail.aspx?ID=1629
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Unread 20-01-2011, 21:54
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Re: Minibot climb rate

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Originally Posted by E2207 View Post
Does rule include using surgical tubing as a drive belt and a friction surface on the wheel?
Nope - I meant "surgical tubing to store energy" rather than "surgical tubing". If the tubing isn't storing energy there's no rule broken.
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  #104   Spotlight this post!  
Unread 20-01-2011, 22:03
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Re: Minibot climb rate

as a referance, Today, team 2200 made it to the top (no top plate yet) of the pole in 2.6 seconds, with a minibot that weighed 4.9lbs. and we still have LOTS of room to save weight.
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Unread 20-01-2011, 22:37
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Re: Minibot climb rate

What type of gearing are most of you advanced minibotters using?
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