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Bochek 13-02-2007 19:57

Confusing Video
 
http://www.wolvcatrobotics.com/resou...0extension.MPG

take a look at this, i found this video, and was a bit confused on how this actually works.

its almost mind boggling to me.

anyone have any ideas?

- Bochek

Jeffrafa 13-02-2007 20:12

Re: Confusing Video
 
Its a cascade style lift, just with the chains/belts ran internally. Its actually much like what our team is doing this year for a lift - it makes the sections extend simultaneously. This helps make it smooth with an equal motor load throughout extension, and also helps stability - as you have greater overlap across multiple extensions until you near your limit.

Check out slide 17 on this powerpoint from the workshops at championships last year - it shows the cascade and continuous systems drawn out side-by-side. http://www.usfirst.org/uploadedFiles...ors_Needel.ppt

Bochek 13-02-2007 21:01

Re: Confusing Video
 
so it is a cascading style arm then, but how do they run the cables on the inside?

Alex Cormier 13-02-2007 21:17

Re: Confusing Video
 
Quote:

Originally Posted by Bochek (Post 577745)
so it is a cascading style arm then, but how do they run the cables on the inside?

lots skill and pulleys/idlers/sprokets.

Ricky2443 13-02-2007 22:17

Re: Confusing Video
 
yea actually theres 2 hamsters inside and when connect to power we shock them and that pushes it up...other than its complicated we dont expect u guys to understand lol

Keo-san 13-02-2007 22:32

Re: Confusing Video
 
We ahev worked our buts off in this tower! Its the first year we implement it. It has no idles gears. It has sprocket and chain but its a rather innovative design.I've seen other towers and our works a little different. We'll post more pictures later. Ohhh wanna know how we got rid of idler gears?? search for our tensioner pictures those are cool!

Bochek 13-02-2007 23:02

Re: Confusing Video
 
that is wicked cool, im still confused on how it goes back in so well.

Rich Ross 13-02-2007 23:23

Re: Confusing Video
 
going back in is a process aided mainly by gravity. The weight (not mass) of the arm pulls it back down in, so that when you loosen the chains/pulleys, the arm slides itself back down. After having used a similar design in 2004 (having a 15 foot tall arm) I'd say this is a strong option. It's a fairly easy design to make, and easy to maintain (ours never broke, only bent in one place that was weakened for other functionality purposes.

Keo-san 13-02-2007 23:39

Re: Confusing Video
 
Our 2005 arm was aided back down by gravity and because of that it proved painfully slow. It was 9ft. high and took about 4-5 seconds either way. This one is 8.5 feet high and it goes up or down in less than two second regardless of its aid by gravity. We didn't want gravity to be the driving force for lowering the tower and we came up with the mechanism you see to power the tower both up and down efficiently and quickly.

efoote868 13-02-2007 23:45

Re: Confusing Video
 
looks really nice, hopefully it weighs very little, and the rest of your robot works just as well! Can't wait to see video of you guys competing!

bjimster1 13-02-2007 23:52

Re: Confusing Video
 
Quote:

Originally Posted by efoote868 (Post 577837)
looks really nice, hopefully it weighs very little, and the rest of your robot works just as well! Can't wait to see video of you guys competing!

it weighs 15lbs including the claw that is not in the video clip

Chris155hp 14-02-2007 11:34

Re: Confusing Video
 
It took 4 ever to make

11Mort11 14-02-2007 11:47

Re: Confusing Video
 
We are using somthing like this as our end effector/arm
80/20 lift

Swan217 14-02-2007 13:36

Re: Confusing Video
 
Quote:

Originally Posted by Keo-san (Post 577788)
We ahev worked our buts off in this tower! Its the first year we implement it. It has no idles gears. It has sprocket and chain but its a rather innovative design.I've seen other towers and our works a little different. We'll post more pictures later. Ohhh wanna know how we got rid of idler gears?? search for our tensioner pictures those are cool!

I have to give you major props for this design. The ThunderChickens (217) tried a similar design back in 2004 and we had a heckuva time with cables binding inside our extendo-arm. It was really hard to troubleshoot too since all of the components were enclosed in the arm.

Our 2004 robot can be seen here.


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