08-11-2005 11:19

billbo911

Re: pic: The Beginings of a Vex-Legal Space Elevator

It looks like you may be a PWM cable short as well

(I love perspective photography!)

08-11-2005 11:26

artdutra04

Re: pic: The Beginings of a Vex-Legal Space Elevator

After recieving a bunch of alpha-prototype parts from VexLabs/IFI for testing and feedback, I thought that I would create something cool. So out with my old single stage elevator on my Vex robot, and in with a multi-stage elevator using the new pieces. Right now it is only two-stage elevator with a maximum extended height of 55 1/2 inches. The elevator works very well so I may increase it to a three-stage elevator.

Also, the center of gravity is still so low on that robot, that even with a tetra on it almost five feet off the ground, it still won't tip over - even when going from full forward to full reverse immediately.

EDIT: Actually, I was three PWM cables short until I my father found one in the bottom of his laptop case. So the limit switches on the arm are useless, because three-foot PWM cables I used are about two-feet too short now.

Here are some more pictures I took outside this morning:

08-11-2005 11:30

tiffany34990

Re: pic: The Beginings of a Vex-Legal Space Elevator

can i just say WOW

that's totally awesome!!! looking really great...

how fast does it take to extend up without the tetra on board?

08-11-2005 11:53

Jeff Rodriguez

Re: pic: The Beginings of a Vex-Legal Space Elevator

Rather than FRC robots using your Vex field, soon your Vex robot is gonna be using the FRC field.
Keep up the great work, Art.

08-11-2005 11:58

CmptrGk

Re: pic: The Beginings of a Vex-Legal Space Elevator

the channel pieces in the lift itself. will they be available from vexlabs. or were they just testing pieces to find out if the pieces would work or not. or are they simply bent these.

that robot is amazing, how much does it weigh? also what kind of sensor is pointed at the mini vision tetra?

08-11-2005 12:22

Stu Bloom

Re: pic: The Beginings of a Vex-Legal Space Elevator

VERY NICE bot ...

But, if I may ask, how did you happen to be identified for alpha testing?? I know of at least one other team that could definitely put some new hardware to the test.

08-11-2005 12:46

Billfred

Re: pic: The Beginings of a Vex-Legal Space Elevator

Yes, I do believe this qualifies...



And here I was thinking Ockham had a high-reaching arm.

08-11-2005 13:51

artdutra04

Re: pic: The Beginings of a Vex-Legal Space Elevator

Thanks for the great comments everyone!!!

Right now, the way it is geared, it takes about 12 seconds to fully raise. It seems a lot, but when you watch it, it actually seems quick. It used to be much faster, but I geared it slower to make it easier to control.
According to JVN, the linear bearing pieces may be available for purchase from VexLabs sometime in the next month or so. They are brand new pieces, that work excelent and have very low friction. They are 12 inches long, and comprise of an inner and an outer metal bearing piece. Here is another picture of them:



Right now, the robot weighs about 7 pounds. The sensor pointing at the mini vision tetra is the Vex Ultrasonic Sensor. I was using it to try to find the panels on the side of the vision tetra in autonomous, but with limites success. Even though it pans back and forth, the angle of the vision panels deflects the sound pings away. Unless the sensor is dead on, it never gets back a good reading because of the geometry of the vision tetra. (read: If you are ever trying to design an anti-radar aircraft - make a giant vision tetra )

How long will it be before I break the six-foot height for Vex?

08-11-2005 14:57

Arefin Bari

Re: pic: The Beginings of a Vex-Legal Space Elevator

Art... I must say you amaze me. I have been seeing your creations lately on chiefdelphi. This is the most effective vex robot I have seen for Triple Play. Very well designed and very creative.

I would guess in the next 2 weeks. Can't wait to see what's coming next.

08-11-2005 19:56

Greg Marra

Re: pic: The Beginings of a Vex-Legal Space Elevator

Sweet!

08-11-2005 22:26

Jay Trzaskos

Re: pic: The Beginings of a Vex-Legal Space Elevator

I wonder if the server rails we used in our tower/shuttle were the inspiration for these additions to the VEX line up? Or maybe it has something to do with Rack Solutions ties to VEX Labs. I'm sure john could clear this up for us.

JT
229

EDIT: For any of you who don't know, IFI, VEX Labs, Rack Solutions.com and Rack Solutions.co.uk are all part of Invovation FIRST, inc.

09-11-2005 12:10

JVN

Re: pic: The Beginings of a Vex-Legal Space Elevator

The server rails we used on 229 last year are from the Accuride 2907 series. These are low-friction slides using ball-bearings. (I used these rails last summer, during my RackSolutions internship. When we were designing our 2005 robot, I remembered them and integrated them into our elevator.)

The VexLABS-Slide Rails are patterned after a different (simpler), friction based design. (No bearings). That RackSolutions came up with for some of our medium duty applications. This design was easily adapated to Vex.

The basic design is that there are 2 "C" sections, which sit inside each other. They slide back and forth on their "corners" and not on their edges, which provides a happily low-friction motion, while maintaining good linear allignment. (See attachment.)

I'm very proud of this rail design, and can't wait to see it released as a product. Art certainly proved to us that it will be well utilized. We at VexLABS continue to be impressed by the high quality of his robot designs, and of his dedication to the Vex program.

Thanks Again Art!
-JV