About the Robot

9791C Push Back Robot Pictures

9791C has been working on their robot since May of 2025. They started out the season with prototypes and proofs of concepts, and worked their way to the current robot with testing, evaluations, redesigns, and even a complete rebuild of the robot.

The Drivetrain

The drivetrain is one of the most important parts of the robot, because without it, the robot wouldn't be able to move around to score, play defense, or do other game tasks.

Once the competition season begun, the drivetrain was the first thing that 9791C built. This drivetrain has a 1:2 gear ratio coming from a 600 RPM motor, on six 4 inch omni-directional wheels. The wheels come in 2.75" and 3.25" diameters as well, but we chose the biggest ones to get over the park zone barrier easily.

The omni wheels help with smoother turning, and in December of 2025, the middle ones on each side were replaced with traction wheels, which provide more stability in the driving and less side-to-side drifting.

The robot's top speed is about 62.8 inches per second, or just above 3.5 miles per hour. Since the drivetrain is the lowest part on the robot, it's also where we store the battery (black box in the middle) and pneumatic air reservoir (shiny cylinder at the bottom) to lower the roobt's center of mass.

The Scoring Mech

9791C has gone through 3 iterations of a mechanism to score blocks throughout the season.

Our first version of the scoring mech was made in July to October 2025, and it was never used in competition. It was a proof of concept in the early season to see how the robot could interact with the game elements. This prototype intaked the blocks in the bottom at the front and scored them in the middle and top at the front. It could hold about 5 blocks at a time.

The second version of the scoring mech was made in November of 2025 and was used until December 21, 2025. It was used in two competitions and won the Excellence Award in December. This uses our early-season idea of rubber band rollers in combination with a new element (chain and flaps) to transport the game elements from the floor up to the goals. This version could hold about 5 blocks.

The last version of our scoring mech was developed from December 2025 all the way to right now. We started off with the first thing the blocks get to on the field.

The Intake

This intake uses a rubber band roller like our previous versions, but it's bigger and has more rubber bands so that it can grab onto the blocks quickly. It also uses the flaps from the second version to get the blocks up to the next part of the scoring mechanism.

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