Mankato Area Robotics Club presents our 24 hour build for Vex Spin Up. Good luck in Spin Up! Follow the discussion on the Vex Forums: www.vexforum.com/t/spin-up-ri...
@@joshkosh8989 the degree bend of the hood can automatically adjust based on data from the vision sensor and the robot’s relative position on the field to allow itself to shoot from anywhere (and a wide range of angles) on the field
Great robot by the way. I was just wondering, what is the piston angle actuator for. Is that to adjust the angle of the shooter to shoot from further distances?
Does the trajectory of your shots change based on how empty or full your reservoirs are since it's a different amount of force being applied to the discs with each indexed shot?
We are probably over, for the sake of time because it was all done in a 24 hour window, we used a lot of cut plastic instead of using metal or something else. Plastic is super easy to design and build with.
The intake in this uses a series of wheels which I'm assuming have a grippy surface. In terms of IQ the best way to go is just a rubber band roller, similar to the one in fling.
What’s your process of building a robot. Like what steps go into designing and building a whole robot. I’m in a new team this year and I want to know the best way to approach one of these challenges
Know what parts need to be included in the bot (intake, lift, drive, etc.) weigh the pros and cons and decide what would be best for the specific game of the season. Then you just build each system and put them together (look at examples like these for help)
just wondering about your thoughts on having this robot, but with an x drive base instead? i feel like it would negate the overheating common in mecanum wheels, but it would also be a tougher build lol
Yeah we actually started building an x-drive for the ri24hr at first, but then we realized for time constraints that it would be a little difficult. So instead we just went with mecanum wheels.
We used 1.625” on the first stage, and 3” on the 2nd and 3rd stages. We would’ve went with 1.625” for all of them if we had enough, but we only had 4 so we had to make do with the 3” wheels. The 60A wheel was for increased compression on the discs in the shooter, and because they expand much less than the softer wheels when spun up to the speeds necessary for a flywheel.
We wanted to go with a 2 motor flywheel because the 1 motor ones looked bad that we saw before we started building. So then we are left with two motors so do an intake. If it wasn’t a 24 hour build we would have ratcheted the intake off of a drive possibly and gone with a 6 motor drive.
Did you have any issues with the flywheel motor overheating? Also was 3000 not enough to get the distance you wanted? Bot looks absolutely crazy. Props
Thanks. We decided to go for 4200 because we saw some people running 3000 and thought it looked a little weaker than we wanted, and we had already planned on 2 motors so we had plenty of torque to work with. I didn’t notice any overheating in the flywheel, the Drivebase was the major limiting factor for how long we could run it as it dies of overheating long before anything else.
A really good way to over come this is to make the spin wheel very heavy. The motor will have really hard time during the first few seconds but afterward the wheels own weight keeps it going and the motor barely does anything and won’t overheat
@@reconnecting5370 yeah so basically by increasing the mass of the flywheel, you are increasing it’s rotational inertia. This means that although it will take longer to initially spin up (as it’s increased inertia causes it to initially want to stay at rest), it will have a better time with speed recovery as once it get to max speed it’ll want to remain there.
@@662bkepler I had our team build a similar shooter, same dual 600 RPM motors, same 7:1 gearing. Same black wheel. Gears and motors carefully aligned, no excess friction, and shafts, bearings and gears lightly lubricated. At full power to the motors and no disks being launched, the motors can't even get the wheel up to full speed. Motors are running at full power, and only getting to about 500 RPM. The don't immediately throttle due to heat, but launch a few disks and they do. Not sure what might be wrong. Thinking of skinning the sides of the wheel with smooth plastic to cover the spokes and reduce air drag. Did you do that?
We wanted to go with some kind of holonomic Drivebase for increased maneuverability, so we started out building a geared up X-Drive but it was taking too long and was getting more jank than we wanted it to be so we switched to Mecanum so we would have some sort of Drivebase done to put the shooter mech on when it was ready (both the Drivebase and the shooter were built at the same time).
Also x drives have rollers which make it very easy to push around. To be honest Especially during the early rounds there will be a lot of bad robots and they will focus on messing you up and by using an x drive they can easily push you and mess up your shots
For the 24 hour build window we felt we didn’t have time to get a x drive fully built and incorporated with the rest of the build. We still believed that the ability to straif is a huge advantage in this game so we went with a meccanum drive. X drive was our first choice tho.
For the robot in 24 hrs we didn't want to add any. Right after we were done we added a GPS sensor on it to test out that system with auto aiming and it worked pretty well. We also would add a color sensor to the front of the bot to automatically flip the rollers instead of having to do it by line of sight.
