pic: Team 1114 - Simplicity in Design

[waialua359]

Originally Posted by Karthik

Yup, the arm section with the roller opens slightly using a cylinder. This allows the ball to fired freely.



The Fisher Price gearbox is used for the rotation of the arm joint. The gearbox is chained up to a 72 tooth aluminum sprocket. We used the stock gearbox, but made some modifications to increase the robustness and reliability.

That was my guess. You can clearly hear it even on webcast matches when your arm rotated. Must be pretty loud.
By the way, how did you get the 72 tooth sprocket? Go-Kart type? We used an 84 tooth last year and 72 this year and that's the most common question we get about our robot.