Overview:
Developed a semi-automated gantry system capable of planting seeds in a grid layout using a combination of linear motion, soil displacement, and seed dispensing mechanisms. The system operates with three linear drives, a pulley system, and two actuators:

  • A rack-and-pinion tool to dig planting holes

  • A 3D-printed seed dispenser, actuated by a solenoid

Required tools and technologies: SOLIDWORKS, 3D Printing, Laser Cutting, Drill Presses, Stepper & Servo Motors, G-Code, Solenoids.

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Design:

  • Collaboratively designed all mechanical components in SOLIDWORKS.

  • I was responsible for designing and printing the middle slider components, which accurately aligned the belt and aluminum bars using press fits.

  • My teammate designed the end mounts for pulley and bar connections.

  • For the actuator, we each prototyped a solution:

    • I proposed a hopper-style dispenser with a solenoid-driven gate mechanism at the base.

    • My teammate designed a mountable system for a commercial seed dispenser, also actuated by solenoid.

    • Both solutions were evaluated for final implementation.

Fabrication:

  • Most parts were 3D printed, with minimal manual machining (e.g., using a drill press to correct hole dimensions).

  • Assembly precision was critical, especially due to tolerance issues from 3D printing such as material warping and fit inaccuracies.

  • Some components required post-processing through filing or reprinting for improved fit and stability.

Programming & Automation:

  • Used G-Code in Repetier to control all three stepper motors (X, Y, Z axes).

  • Enabled synchronized or independent motion across the gantry for precise positioning.

  • The rack and pinion actuator handled vertical movement to punch holes, while the solenoid-actuated seed dispenser provided a half-degree of freedom on the Z-axis.

  • Created an automated sequence to:

    • Move to a planting location

    • Dig a hole using the actuator

    • Position the seed hopper

    • Dispense a seed

    • Repeat for a 2-row by 4-column planting pattern

    • Return to home position and terminate

See video demonstration of project here: https://drive.google.com/drive/u/3/folders/1ADtxkjpBTxIGR8mxQMStaJB8VEgogqoY