Executive summary can be found here:
There are ways to practice baseball offense with pitching machines, but there aren't many options when it comes to fielding machines. Traditionally, baseball fielding practice is carried out by a coach or some person standing at home plate and hitting a ball to fielders. This means that practicing fielding techniques such as catching balls, fielding grounders, and pitching is largely impossible without the presence of additional personnel. The Baseball Fielding Machine will take the place of the second person and allow someone who wants to practice their pitching or fielding to do so alone.
Objective
The overall objective is to build a machine that will throw balls at different trajectories and speeds up to 70 mph so that players can catch them and then throw them back into a net that will feed the machine for constant practice. Additionally, the machine will require remote control capabilities that allow the user to control the feed rate, trajectory, and velocity of the balls being launched.
There is a gap in the market; while similar concepts exist, all of them require constant reloading, manual baseball collection, and none of them can replace a coach or second person on the field. This machine will allow for solo practice.
Initial iteration of the flywheel launching system
Final Design
The final design of the baseball fielding machine consists of four major components: the receiving system, feeding system, launching system, and the remote control system:
The receiving system consists of a net leading into the funnel/hopper that will direct the caught balls into the feeder system.
The feeder system is a tube and contains a ball platform controlled by a servo motor to feed the ball into the loading arm. The loading arm also has another ball platform to hold the ball while the arm moves to aim the ball.
The launching system is a flywheel run by a 90V DC motor that will spin to launch the ball up to 70 mph.
These features are controlled by the remote control system with transceivers communicating signals between the machine and the remote.
Computer Aided Design (CAD) of the major components
Here are some designs for the sub assemblies in more detail:
CAD of ball feeder w/ servo motor
CAD of loading arm w/ servo motor
Here is a simulation of the ball being launched after loading:
Performance Results
Machine moving right/left up down
Launching a flyball!
Groundball fielding