Chief Delphi - Minibot climb rate

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Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- Technical Discussion (http://www.chiefdelphi.com/forums/forumdisplay.php?f=22)

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

waialua359

21-04-2011 03:48

Re: Minibot climb rate

Our team is pretty excited about our new and improved minibot.
It is currently performing between 1.1 - 1.2 seconds from dead start (no ramp).
Our old one was good enough in weeks 2 and 4, but knew that it had to improve to stay with the mix of teams that are hovering above, at, or right below the 1 second mark.

jblay

21-04-2011 04:13

Re: Minibot climb rate

Quote:

Originally Posted by billbo911 (Post 1052570)

OK, more info and a video.

Kevin,
Shifting the battery up to the top and placing some surgical tubing at the back of the battery did the trick. Now our pivot point is the farthest point from the pole. This video is taken with a fairly depleted battery.

http://www.youtube.com/watch?v=P89k0hlHd1E

Either,

More accurate measurements:

Weight is 10052g, or, 2.32 lb.
Wheel diameter is effectively .45" when compressed against the pole.

So, based on our earlier discussions, it is really close to ideal.

It seemed to me in the initial video like the plate on the top of your tower was slanted which may have caused your minibot to fly off. Its a problem we had before connecticut and then I realized that was the reason and we never had the issue again.

I don't know if you tested with a full battery or not but the battery being full would change the speed of the minibot I imagine and cause it to go slower and could be part of the fix for the minibot flying off the pole which isn't an actual fix.

wireties

21-04-2011 07:01

Re: Minibot climb rate

Quote:

Originally Posted by AlDee (Post 1052671)

At the beginning of the build season, someone had suggested magnets and we quickly dismissed the idea, thinking with the potential weights involved, magnets would not be practical, except perhaps to hold a latching mechanism closed. As the build season progressed we experimented with many differnt concepts and prototypes. I favored a balanced approach as you describe. I found that anytime we would get close, one tweak would throw the whole thing off. When someone put together a prototype with a rare earth magnet, it became very simple. No muss no fuss, just get it to the pole and climb. That was the direction we went and it worked very well.

I surrender and am ordering magnets from K&J to try before the off-season events!

Brandon Holley

21-04-2011 08:23

Re: Minibot climb rate

Quote:

Originally Posted by jblay (Post 1055097)

I don't know if you tested with a full battery or not but the battery being full would change the speed of the minibot I imagine and cause it to go slower and could be part of the fix for the minibot flying off the pole which isn't an actual fix.

I'm a little confused...you are saying that a full battery will cause the minibot to go slower??

-Brando

Ether

21-04-2011 08:57

Re: Minibot climb rate

Quote:

Originally Posted by waialua359 (Post 1055096)

Our team is pretty excited about our new and improved minibot.
It is currently performing between 1.1 - 1.2 seconds from dead start (no ramp).

Could you tell us more about it?

- weight?

- wheel (shaft) diameter?

- wheel (shaft) tread material?

- magnets or something else?

- have you measured the friction?

Alpha Beta

21-04-2011 09:26

Re: Minibot climb rate

Quote:

Originally Posted by Brandon Holley (Post 1055115)

I'm a little confused...you are saying that a full battery will cause the minibot to go slower??

-Brando

Well, of course. A fully charged battery has all of those extra electrons to lug around. Oh wait...that's not right. They're still there just switching between the anode and cathode. I guess I'm confused too. :rolleyes:

Team 288

21-04-2011 10:43

Re: Minibot climb rate

Quote:

Originally Posted by Ether (Post 1055122)

Could you tell us more about it?

- weight?

- wheel (shaft) diameter?

- wheel (shaft) tread material?

- magnets or something else?

- have you measured the friction?

I can probably answer for this person, by inserting 931's minibot, instead of theirs.

931 has a minibot that climbs justbelow the 1 second mark.

Weight : 2.2 lbs

Wheel shaft diameter : .45 inches

Wheel shaft material : Electrical tape(standard)

27 lb pull magnet

No. =)

We'll have 6 of these at worlds and are willing to let other teams borrow (teams in Archimedes get priority)

Here's a video with a 7 foot pole. We got .7 seconds for total climb time.

http://www.youtube.com/watch?v=cUSCBbhu4JM

jblay

21-04-2011 12:07

Re: Minibot climb rate

Quote:

Originally Posted by Brandon Holley (Post 1055115)

I'm a little confused...you are saying that a full battery will cause the minibot to go slower??

-Brando

Didnt see that I wrote that backwards the first time. I meant the battery not being full would slow the minibot down cause before the video he says that the battery was not full.

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