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-   -   Letting robots on top vs getting on top of robots (http://www.chiefdelphi.com/forums/showthread.php?t=51143)

robostangs548 08-01-2007 10:23

Re: Letting robots on top vs getting on top of robots
 
I can tell you right now.... the ramp design for our robot is 0 degrees and can lift 2 robots 1 1/2 feet off of the ground. our robot is 4 feet 120 and has an arm, four wheel speed, and four wheel torque mode. Not sure if all in going to work since we are still in the designing stages, but it looks pretty promiseing. Anyway good luck everyone.

DjAlamose 08-01-2007 10:28

Re: Letting robots on top vs getting on top of robots
 
Quote:

Originally Posted by Hachiban VIII (Post 550370)
After playing around with this chassis today, we found that it could climb a 15-20 degree slope. Keep in mind that this thing has a ground clearance of about an inch and was not designed for climbing.

Seeing this tells me that a ramp that has an angle of 20 degrees or less is fine. It can be done easily (I'm looking at about 17 degrees for a ramp right now). Also knowing that bumpers need to be a minimum of 2.5" above the ground, if your frame matches that (even 2") then there should be no problem at all.

Also to teams building ramps, look at what material you plan on using and see if the surface (i.e. diamond plate) would make it easy or hard for a robot to climb up it. You can always cut holes and things in it to help with tracktion but remeber that some surfaces are still pretty slick.

Not only does your robot have to support its own weight (if you plan on holding other robots), if you have a second robot on top, you are now holding up 240 lbs or so. Having another robot squish yours would be a very bad experiance so plan on making your robot robust.

As for lifting robots, take into account the changing CG of your robot and the one you would be lifting. Also remeber to have a latching mechanism so when power is disabled the one you will be supporting doesnt come crashing to the ground.

Hopefully some of these tips will help someone. Just thought I would share my thoughts and experiances.

Parker 08-01-2007 15:00

Re: Letting robots on top vs getting on top of robots
 
What about having a ramp and the piston idea. Have a robot drive on top of you then fire the pistons. The pnuematics can easily lift the max. 240 lbs. of 2 robots. Besides, I don't think three robots stacked on top of 1 is really going to happen that much.

Zoheb N 08-01-2007 15:09

Re: Letting robots on top vs getting on top of robots
 
Well our team had about a 45 min debate about if we should get robots on top of us or if we should get on to another robot.. after 45 mins we finally came to the conclusion that we would not be liftin other robots and would not focus on getting on top of robot but will try to be able to get on top of another one, but than again that was only a day 1 decision it could still change

LeadU2Fun 08-01-2007 15:47

Re: Letting robots on top vs getting on top of robots
 
Quote:

Originally Posted by Bongle (Post 550091)
It really depends on the ramp. If you have a 4-foot-long deployable ramp, then you're only looking at a 14 degree angle to climb, compared to Aim High's 30 degrees. Even drivetrains not designed specifically for ramps should be able to do that. But really, that'd probably be a feature of a given ramp design. I can see it while trying to get picked for finals "Team xxxx: With a 14 degree ramp that ANYONE can use".

With that trigonometry you will raise the robot 11.6". Remember the other option is to only raise them 4". One robot on each side raised 4 inches is the same as being able to raise one robot 12". Based on the difficulty the past robots had at getting up that high it might be a safer strategy to rely on two robots getting up a 16" ramp to achieve 4" at a 14 degree incline. A 4" step might not even need a ramp with many robots.

lukevanoort 08-01-2007 16:10

Re: Letting robots on top vs getting on top of robots
 
As a note to all teams planning to build lifter/ramp bots, or debating the idea like us, two robots is actually a max of about 297 lbs, (2*(120lb robot + 15lb bumpers + 13.5 lb battery) not 240lbs.

Michael Hill 08-01-2007 16:16

Re: Letting robots on top vs getting on top of robots
 
Quote:

Originally Posted by lukevanoort (Post 551330)
As a note to all teams planning to build lifter/ramp bots, or debating the idea like us, two robots is actually a max of about 297 lbs, (2*(120lb robot + 15lb bumpers + 13.5 lb battery) not 240lbs.

Ya, it seems like a lot of people forget about the bumpers and battery. They add a significant amount of weight.

Madison 08-01-2007 16:22

Re: Letting robots on top vs getting on top of robots
 
Quote:

Originally Posted by Michael Hill (Post 551341)
Ya, it seems like a lot of people forget about the bumpers and battery. They add a significant amount of weight.

...and it seems that people continue to forget to factor in the weight of their own structure. Remember that you're not only lifting their robot and its battery and bumpers, but also the platform and supporting structure of your own robot as well.

Kim Masi 08-01-2007 16:31

Re: Letting robots on top vs getting on top of robots
 
In the poll, it asks if teams would rather descore/rescore spoilers than climb on other robots...is anyone taking that route instead?

I think it's really going to depend on the way that particular match is going, whether its more benificial to move a spoiler or to lift two robots...

Emma O 08-01-2007 16:45

Re: Letting robots on top vs getting on top of robots
 
We were talking about this yesterday at our meeting and I think we're pretty set on letting another robot climb on us. Another teammate and I were working on ramp possibilities during physics class today. xD

roborat 08-01-2007 16:51

Re: Letting robots on top vs getting on top of robots
 
The way i read the rule, it states that the lowest part of the robot is higher that 4 inches above the carpeted surface. This would allow a platform to be deployed and let a robot climb it and not on my robot. We are looking at a prototype and it folds back over our robot and the arm is still useful for the ringers. After we get to the home zone, we will deploy the platform with a small ramp to climb. It will have to be parked sideways. Still researching this ideal.

gondorf 08-01-2007 18:48

Re: Letting robots on top vs getting on top of robots
 
my own team personally thinks that we can have a platform on top so the other 2 robots can climb up like the ramp last year but have the platform double as an arm for ringers. i personally think the helicopter was much more doable.:ahh: :eek: :cool:

LeadU2Fun 09-01-2007 09:02

Re: Letting robots on top vs getting on top of robots
 
Quote:

Originally Posted by lukevanoort (Post 551330)
As a note to all teams planning to build lifter/ramp bots, or debating the idea like us, two robots is actually a max of about 297 lbs, (2*(120lb robot + 15lb bumpers + 13.5 lb battery) not 240lbs.

Are you implying that the mechanism (ramp,platform,etc) that the other alliance robots are mounting cannot be touching the floor? I didn't see anything about that. We should be able to build a platform that rests on the floor and raises the other robot 4". The platform would only need to support the weight of 1 robot. You could have this on both sides of the robot and lift 2 of them.

Graham Donaldson 09-01-2007 10:18

Re: Letting robots on top vs getting on top of robots
 
I've seen the idea of a helicopter pop up once or twice, so I just have to say this again:

At the end of a match, the two drive teams on the chopper's alliance who will be picked up turn to one another and yell (in a GOVERNATOR voice): "GET TO ZE CHOPPUR- NOW!!"

The chopper team picks them up and says over a megaphone to the opposing alliance: "ASTA LA VISTA, BABY!"


Now, back to the topic. I won't give away how our team is planning to pick up robots, but suffice to say that we want to passively pick up one to 4"
(i.e. a ramp on top of our 'bot), and then worry about getting that one to 12", because that's more likely than two at 4" (hopefully one will be dealing with spoilers), and it's the same point value.

Ty Tremblay 09-02-2007 10:50

Re: Letting robots on top vs getting on top of robots
 
I think this poll is inaccurate. For instance, we have the capability to lift one or two robots 12" off the ground, but if there is a better lifter on our alliance, our lifts are removable, allowing us to ge lifted. And if our lift breaks, we can hang ringers until it is time to be lifted.


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