Re: Arm Designs
 

we were just thinking of using a reverse wheelie bar on a long clyinder. I have the feeling that that issue is going to be a trial and error thing. Either that or our physics expert can get to work.

Re: Arm Designs
 

Hey anyone thought of using a lift and a arm/ wrist mechanism? I think that with the lift no matter where u put it in the tetra you will have a hold of it. But if someone could implement an arm and a lift in one i think it would be awesome.

Re: Arm Designs
 

so i just came up with a most ingeneous idea to help solve the problem of stress on the robot arm if you use a jointed arm, springs, use something like a makeshift garagedoor spring and attatch it between, and im looking at my arm while im doing this, the wrist and the shoulderthat way the stress is limited on the arm, the only problem is gonna by the energy you get from it coming back, if you dont use a tremedously big spring then it should work.

Re: Arm Designs
 

i have a design in mind. But does anyone have a good idea on how to extend a telecsoping tower? just thinking? im trying to aviod cables because past designs by my team have not gone well

Re: Arm Designs
 

We are thinking of a basic swinging arm mounted about four feet in the air and hanging down at starting. Hopefully it will be able to lift tetras from the ground and anywhere else (driving away or toward to get correct height of arm) and place then on top of a goal.

The only question is what to put on the end of the arm to grab the tetra.

Re: Arm Designs
 

BEWARE OF THE 2-JOINTED ARM!! its taken us 2 years in a row to get that message through our heads.. it didnt work the first time, and didnt do any better the 2nd time.. right now, were looking at a basic arm with a few ...features... built into it.. itll either be a piece of junk, or amazing
j

Re: Arm Designs
 

my team is new for this year, and after watching videos from last year i fear our bot will topple with our existing design. however, for a gripper, perhaps something similar to a 3 pronged fork? the 2 outside prongs turn upwards. the middle prong spears the apex of the tetra, the 2 outside prongs turn downwards, holding onto 2 sides of the triangle. it should be simple and secure. suggestions?

Re: Arm Designs
 

Our arm is a fairly common and simplistic design, following traditional 4-bar lift style.
Our possible tetra manipulator, however, is probably an idea that no other team has come up with though. But You'll just have to wait for our 2005 Reveal to see it, if it makes the vote :)

Re: Arm Designs
 

sorry but can somebody explain to me what a 4-bar is? thanks

Re: Arm Designs
 

Re: Arm Designs
 

I'm also worried about lifting those 9 pound tetras. Last year it was difficult to lift our 3 pound max hook with the van door motor (however, we had no reduction just a directly connected motor). Team 980 had a beautiful arm last year for lifting that large cap ball if you got a chance to see it. We want to design something similar to that. Where does everyone plan to get the muscle for that kind of lifting?

Re: Arm Designs
 

You'll have to use a sick reduction if you're planning on lifting a lot tetras (3-4?). A lot of this game has to do with physics also, you simply do not want 10 pounds hanging 2-3 feet out while moving around.

Re: Arm Designs
 

If you are looking for a good lift + arm combination check out Team 229's 2004 robot

Re: Arm Designs
 

Some of mentioned the problem of tipping. Are outriggers legal? :rolleyes:

Re: Arm Designs