XRP FRC Rebuilt Robot

My FRC team got XRP kits this past year and decided to customize them after FRC robots. Last year's game, Reefscape, was a great game to build small for. This year's game, Rebuilt, introduced some exciting challenges for a 1/4 scale robot built on the XRP system. Considering how customizable it is, though, we were able to make a small scale, ball launching robot.

Here's a video of it in action

Here's the Onshape link, if you want to tweak it to fit parts you have.

This tutorial assumes that you've built a basic XRP robot and have some working knowledge of robotics.

Most importantly, this project is built using an XRP

Next, the parts are mostly 3D printed. So, you'll need a 3D printer. Any filament will work.

The compliant wheels and shooter should be printed out of TPU.

The servos are MG90S.

The motor I used for the intake is a standard n20.

For the shooter drum I used this motor

And this battery

And this motor controller

Here are the balls I used:

I used a customized XRP chassis for this project that I modified from the stock chassis. This a classic, drop-center, tank base. These were common in FRC "back in the day."

This uses the normal driving wheels, but free spinning front and rear wheels to stabilize it. I have versions for M3 bolts or small bearings.

The intake arm is controller with a servo. The servo mounts connect to the XRP rails using the small scale hex shaft. Use the normal servo hardware.

The n20 motor attaches to the outside of the arm, the gears mount to the inside. Use the matching axles to hold them in place. The compliant wheels get spaced out along the roller axles.

The hopper attaches to the front rail and covers the intake pivot and most of the electronics. At this point, you will want to have your wiring done, but the hopper can rotate up a bit to access the wiring.

Add the motor shooter panel to the rear rail and attach your motor. This motor needs a motor controller and a separate battery. Add the gears to the inside of the panel.

The ramp adjustor is on a servo and hex shaft with two fingers to move the ramp.

The axles and shooter wheel go in between the two panels.

Some M3 bolts are used to hold some parts together. Some small bearings can be use on the shooter.

There are a lot of different kinds of hardware out there. You'll likely have to fiddle with this to make it work with what you have. As this is modeled after an FRC robot, the fun part is in making it your own.