Custom Dart Launcher

Most parts were fabricated using a Prusa i3 MK3S+ printer, printed in PLA. Other key components included a lynch pin (trigger pin), a segment of 1/4" steel rod (safety pin), and a linear bearing. Initial prototypes saw issues with both PLA friction and inconsistent attitude of the dart at launch. These issues were resolved with a linear bearing/Kapton tape lining, and a pusher assembly to directly push the dart head, respectively.

In order to trigger the launch mechanism, we simply use the gripper's motor to "open the gripper", thereby releasing the pin holding the dart back and releasing the spring from its preloaded state.

1. With Sawyer arm safely in the tucked position, draw back the launcher by pulling on the pushrod from the back, thereby compressing the launch spring.

2. Insert a 1/4" safety pin through one side of the launcher, holding the pushrod stably at the desired power setting.

3. Align the trigger pin with the same power setting, and close the grippers, thereby compressing the trigger-assisting spring.

4. Tie the string to secure the trigger pin to the trigger-pulling arm.

5. Ready to open grippers and LAUNCH!