The Cougar v6 MoonBot Rover takes on the first part of the MoonBots lunar course. The v6 rover turns and maneuvers easily on the LEGO pip terrain. It climbs walls, and locates its position on the lunar surface using the combined readouts of compass and proximity sensors. Check out the home-made Omni wheels on the back.
Last Updated on Wednesday, 18 August 2010 15:44
Cougar Thumper Moonbot
Written by The Cougars
Tuesday, 17 August 2010 21:00
This was our first test of the omni wheels WITH rubber tires.
So, to all those who read this blog(not sure how many people that is ) but here's what is new!: We have for the most part finished our run!!!(HIP-HIP!) This means that we can grab all but the southernmost yellow rings on the right side of the field. We are tweaking the programming to make climbing out of craters easier to do, and more reliable. Once we have that done, we will begin making timer programs as back up plans. This means that the robot will keep track of the 3 minute run countdown, and if something should go wrong, leaving it with a short amount of time(too short to finish the run), it will head back to the starting ramp, so that we can at least double the points of the rings we already have. Several of these back up plans will be programmed in to various points in the run as fail-safes. Lastly, if the robot has enough time left, we may program it to decide based on time whether it thinks it should try to grab the last two yellow rings. With not a lot of days left we are entering CRUNCH TIME! It seems like our goals are now just within our grasp if we keep working as hard as we have been! :D
Last Updated on Tuesday, 17 August 2010 20:48
Cougar v5 Chassis
Written by Jamie Diamond
Tuesday, 17 August 2010 10:54
Here's the Cougar v5, that's version 5 (we're now on v6), chassis. It did pretty well both at maneuvering on the LEGO pip surface of the moon, and climbing the ridge and crater walls.
The arm was shorter than our current arm but it did use the internal differential allowing us to raise and lower the arm and to open and close the grabber on the end with a single motor . We had intended to go into each crater to pick up the two rings, but we couldn't stay far enough away from the first ring to pick it up without knocking it down. So we switched out this arm for a longer arm and started grabbing the first ring from outside the crater and the 2nd ring from inside the crater. Much better!
We still had a chain drive and then gave us 2 problems. One, their was quite a bit of slop in the chain, especially when changing from forward to reverse. And two, it would skip some under heavy loads and occasionally the chain would break. If that happens, mission over!
Last Updated on Tuesday, 17 August 2010 09:55
Cougar's MoonBot Arm with Internal Differential
Written by Joey
Saturday, 14 August 2010 21:22
Here's a picture of our new arm. It sorta has a built in differential. The Motor will spin the gears to close the arm. Once the arm closes so the gears can't spin any more then the motor will lift the arm. When the motor runs the other direction it will open the arm as far as the arm-stops and then lower the arm. The jaws of the arm act as the locking mechanism for the gears to raise the arm. This idea was from the E-Bots Loudmouths in the FIRST LEGO League Smart Move Challenge. They had an arm similar to this design.
For the LEGO Digital Designer CAD we had to substitute a double conical 12 for a double conical 20 gear on the inside of the arm on the axle next to but not through the motor. We just couldn't make the 20 fit even tho it fits in real life.
Joey's omni wheel, IS IT SAFE? Jacob is building a 4 wheel drive chassis. We're talking about how deadly Joey's little top thing is. Joey's omni wheel... OK, if you went up to that and didn't know what it was, would you be afraid of it or would you say it was cuddly. I'd say it was awesome.