Arm and grabber design test video
 

Re: Arm and grabber design test video
 

I love it! I hope he's under 120 pounds!
Also, where is the mini robot going ?:rolleyes:

But all kidding aside, I love the idea of putting somebody on the moving chasis! Hope to see a real robot version !

Re: Arm and grabber design test video
 

hey man i just watched your video and i have a small question? Where exactly do you bolt the human on? lol jk however i must say if you and your team designs it and it successfully works that's awesome! :)

Re: Arm and grabber design test video
 

Good stuff :D Nice arm idea, You might want to have some type of system to channel the tubes onto your grabber a little better. But this is a great first example :)

Re: Arm and grabber design test video
 

Just a few questions...

1. Would the GDC approve of the green energy ATP-usage machines to power the robot?

2. What if the lifting mechanism springs a leak in their system?

I'm curious about the response.

Re: Arm and grabber design test video
 

First of all, tell the guy pushing to bend his legs; he would generate more force that way. Other than that, what would be "doing" the closing? Would it be a motor or a pneumatic actuator?

Re: Arm and grabber design test video
 

Our team is not using any pneumatics this year so the arm mechanism will be run by a motor.Also later on we will post CAD drawings of the arm on our website. http://falconroboticsteam842.org/default.aspx

Re: Arm and grabber design test video
 

I like it! is there any special coating/material on the bars that grip the tube? or does geometry make it work?

Re: Arm and grabber design test video
 

What's the song name? It sounds familiar, but I can't place my finger on it.

Also, that's a really unique concept. How did you guys come up with the idea?

Re: Arm and grabber design test video
 

<R14> When a ROBOT is in its STARTING CONFIGURATION, no part of the ROBOT shall extend outside the vertical projection of the FRAME PERIMETER.

How are you going to configure your manipulator such that it doesn't extend past the front C-Channel before the start of the match?

That's a whole separate problem to work with...I think that rule ruins a lot of peoples' days :P

----------------------

Daniel Krastev
FRC 3017
Captain of Engineering

Re: Arm and grabber design test video
 

As I recall it sprouted from a discussion about last year's pinching mechanisms. We were talking about the benefits of a wide grabber and this concept emerged.

We think we have that part figured out as well. As a matter of fact, I think the manipulator we're considering at the moment would stay in the 60" cylinder with this gripper attached. Here's a hint as to the approach we're taking.

Re: Arm and grabber design test video
 

That's 84 inches now....

Re: Arm and grabber design test video
 

If only there had been a three-year old sitting on the back of the robot until the last ten seconds of the test.....

The beauty of this post isn't just that it shows an idea for a gripper that might help inspire teams, but that it shows a great way of prototyping a concept. We've built all sorts of mock ups over the years, but never thought to do it this way!

Brilliant!

Jason

Re: Arm and grabber design test video
 

prototyping at it's finest.

Re: Arm and grabber design test video
 

Right now there is currently double sided tape on the bars but we are planning on using this cell phone cover material that is sticky but not sticky. I am not really sure how to explain it.

Re: Arm and grabber design test video
 

Oh, like the stuff on the back of Steve's phone? :)

Re: Arm and grabber design test video
 

Yes, and the sticky and rough material on the phone is now called "stuff".:D

Re: Arm and grabber design test video
 

One time I was at a convenient store and there was a little display for a no slide cell phone pad. It was inclined at something like 45 degrees and you could rest a cell phone on it without it sliding off. Truly miracle material like this would make for a successful manipulator.

Re: Arm and grabber design test video
 

I think it's a remix of Deadmau5 - Strobe, it doesn't sound exactly like the original.

Re: Arm and grabber design test video
 

Fredi,
If only more teams follow your lead for design. Think, prototype, think some more, prototype some more, think and design. I am always impressed by your team. Nice job.

Re: Arm and grabber design test video
 

Thanks, I thought that was them. I'll have to go through the discography later. (Yes, I really do love that genre! :D)

Re: Arm and grabber design test video
 

I like it, though just through watching the video, you have the arm closing at the exact time that the bottom of the "gripper" touches the tube. This should be tried in a more realistic situation where the bot will drive past or push the tube while closing the "gripper". That way you can verify that the gripper will grasp the tube as it is being pushed away.

Just a thought. We are going to be working on a complex arm starting today!!!!

Re: Arm and grabber design test video
 

Or add a contact switch to the bottom of the gripper.

Re: Arm and grabber design test video
 

Thanks for posting, Fredi. I love your prototyping methods. Any thought to how to pick up the logo pieces in auton? We had a couple wrinkles to iron out in Rack 'N' Roll having to start inside the 28x38x60 envelope (with our gripper closed) and the game piece touching the robot - we had to push the tube away first, then drive forward, pick it up, then finally approach the rack. Or will you be able to hold the ubertube in the gripper at the start of auton?

- Steve

Re: Arm and grabber design test video
 

this stuff?

http://apps.facebook.com/ecwid-shop/store/43090479006

or if that doesn't show up where you are,

http://www.egrips.com/

Re: Arm and grabber design test video
 

We don't always have the money to just buy our way out so we have people argue their points to convince the rest of us, then we buy, buy, buy!

Re: Arm and grabber design test video
 

We might work on that soon....

Re: Arm and grabber design test video
 

The NERDS 2007 robot has a "wrist" joint that let the claw (with a tube loaded in it) flip down and extend out at the beginning of the match. I seem to recall it took a lot of planning and a bit of luck to make it work. We're thinking of a similar concept again, but possibly a telescoping action instead of hinging?