Now that you have the gantry sides (Parts Q and R) bolted to the Gantry Bottom Support (Part P), it's time to finish up the y-axis frame by adding the Y-Axis Rail Support. Consisting of two pieces of MDF bolted together, these two pieces will provide stability and rigidity to your CNC machine.
The y-axis frame you're building performs two functions. It rolls along rails mounted on the sides of the table, allowing the machine's router to move forward and backward. It also provides a "minitable" that allows the z-axis frame (covered in Chapter 13) to move side to side.
The y-axis frame consists of six pieces of MDF:
Y-Axis Rail Support (front)
Y-Axis Gantry Bottom Support
Y-Axis Gantry ...