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-   -   Team 254: World's Fastest Climb Teaser (http://www.chiefdelphi.com/forums/showthread.php?t=115508)

Navid Shafa 31-03-2013 01:50
Re: Team 254: World's Fastest Climb Teaser
 
If I recall correctly, they are using constant force springs and perhaps that may aid the climbing after the buzzer with the already present "vertical momentum". I would assume that this would only work though if they already have the hooks over stage three. At this point, all the constant force springs would need to do is essentially pull the lifting stage back into it's original housing.

Cory 31-03-2013 02:02
Re: Team 254: World's Fastest Climb Teaser
 
This does NOT climb after the buzzer. It is purely motor driven. There is no stored energy whatsoever (besides the 10 pt hanger).

TheMadCADer 31-03-2013 02:04
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by Navid Shafa (Post 1254863)
If I recall correctly, they are using constant force springs and perhaps that may aid the climbing after the buzzer with the already present "vertical momentum". I would assume that this would only work though if they already have the hooks over stage three. At this point, all the constant force springs would need to do is essentially pull the lifting stage back into it's original housing.
Where have you heard this? I haven't been able to gather anything other than the fact that it's driven by their PTO. I know 1114 does use CF springs, though they use them to extend their arm, and then motors pull it back in.

I wouldn't be surprised if they've counterbalanced some or all of the robot weight, though. It looks like they move upward faster than they drive, and going upward takes considerably more force than moving sideways. This could just be their drive being geared down more, of course. If you look at the amount of power you can get out of 6 CIMs, it's not out of the question for ~150 pounds to move that fast.

EDIT: 254 posted as I wrote this. No stored energy. 6 CIMs are strong.

Navid Shafa 31-03-2013 02:05
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by Cory (Post 1254865)
This does NOT climb after the buzzer. It is purely motor driven. There is no stored energy whatsoever (besides the 10 pt hanger).
I see, so the constant force springs are no longer in use. Thanks for the clarification.

Gray Adams 31-03-2013 02:17
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by TheMadCADer (Post 1254867)
Where have you heard this? I haven't been able to gather anything other than the fact that it's driven by their PTO. I know 1114 does use CF springs, though they use them to extend their arm, and then motors pull it back in.

I wouldn't be surprised if they've counterbalanced some or all of the robot weight, though. It looks like they move upward faster than they drive, and going upward takes considerably more force than moving sideways. This could just be their drive being geared down more, of course. If you look at the amount of power you can get out of 6 CIMs, it's not out of the question for ~150 pounds to move that fast.

EDIT: 254 posted as I wrote this. No stored energy. 6 CIMs are strong.
Theoretically 6 CIMS can move ~150lbs up 90 inches in less than a second.

TheMadCADer 31-03-2013 04:34
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by nicholsjj (Post 1254529)
The only worry I have about this climb is that it looks like you guys touch 3 levels around the 5.8 sec mark. It's probably something that can be fixed pretty quick if it's a problem at all.
I'm not seeing what you're seeing, I guess. I was able to get the video stopped at a bunch of spots around 5.8 seconds, which should be close enough to see what you're talking about.

At this point they are pulling up to the third level, and only touching the third zone (hooks around the horizontal bar). They might brush the second level on the way by with their frame/bumpers, but they aren't even close to touching the first level. With their swinging motion dialed in like it is, I doubt they even touch the second level on the way by.

Cory 31-03-2013 04:54
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by Navid Shafa (Post 1254868)
I see, so the constant force springs are no longer in use. Thanks for the clarification.
There were never constant force springs. You may be thinking of our 2008 elevator, which used a constant force spring to neutralize the weight of the carriage.

nicholsjj 31-03-2013 13:31
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by TheMadCADer (Post 1254882)
I'm not seeing what you're seeing, I guess. I was able to get the video stopped at a bunch of spots around 5.8 seconds, which should be close enough to see what you're talking about.

At this point they are pulling up to the third level, and only touching the third zone (hooks around the horizontal bar). They might brush the second level on the way by with their frame/bumpers, but they aren't even close to touching the first level. With their swinging motion dialed in like it is, I doubt they even touch the second level on the way by.
Sorry this was a mistype it actually happens around the 4.8 second mark when it looks like they bounce off the first bar. again it could just be a ghost that im seeing and im sure that team 254 has put in the time and effort to make sure it doesn't happen. https://www.youtube.com/watch?v=I-Ir...embedded#t=16s This is where i think it happens but the climb is so fast that its hard to capture the exact time of it.

Travis Covington 31-03-2013 14:45
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by nicholsjj (Post 1255033)
Sorry this was a mistype it actually happens around the 4.8 second mark when it looks like they bounce off the first bar. again it could just be a ghost that im seeing and im sure that team 254 has put in the time and effort to make sure it doesn't happen. https://www.youtube.com/watch?v=I-Ir...embedded#t=16s This is where i think it happens but the climb is so fast that its hard to capture the exact time of it.
You are likely seeing the intake hit the level 2 bar or are seeing the robot stop swinging as the telescoping arms hit the level 3 bar. When the level 1 pneumatic hooks are retracted, the the telescoping arms are not long enough to allow the bottom of the robot to touch the level 1 bar and the level 3 bar, even while swinging. The robot could theoretically swing 360 degrees around the level 2 bar and never touch the level 1 bar.

tickspe15 05-04-2013 21:02
Re: Team 254: World's Fastest Climb Teaser
 
Was their climb as fast today in competition as it was on their practice feild with the other robot? Does anybody have a video?

Gregor 05-04-2013 21:06
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by tickspe15 (Post 1257637)
Was their climb as fast today in competition as it was on their practice feild with the other robot? Does anybody have a video?
From what I could tell from the webcast, they were doing the slow* climb, the one featured in the leaked video.

*slow is a relative word.

ejSabathia 05-04-2013 21:17
Re: Team 254: World's Fastest Climb Teaser
 
Quote:
Originally Posted by Gregor (Post 1257639)
From what I could tell from the webcast, they were doing the slow* climb, the one featured in the leaked video.

*slow is a relative word.
We've been running our hang manually and "semi-manually" without issue. Anyone who's climbed knows watching your robot scale the pyramid is an uneasy feeling. With that said we still may decide to remove the safety and go full auto sometime tomorrow.

Abhishek R 05-04-2013 21:28
Re: Team 254: World's Fastest Climb Teaser
 
Yeah, definitely something I would save for a really necessary time like eliminations. A few seconds isn't worth the robot.


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