From experience I recommend buying all the necessary materials before starting the realization of any project.
Materials and components:
To build the base we have been cut several wooden boards which have made holes and blind holes. These tables form the support of the machine. The screwed steel rods operates as a worm drive. The blind holes serve as a stop for the steel bars that act as guides for the x-axis, in the middle, we put the screwed steel bar, that when turning, generates displacement in the x-axis. Above, we have put a wooden board greater weight and thickness for stability.
Bridge construction (y-axis) is very similar to that of the base, but this is supported on a table that is moved in the x-axis by a fixed nut below table. You see it at the last picture.
And finally the z-axis, similarly fact that the other two axes and carries a support for a milling or engraving machine. To test I used a screwdriver to move the axis. :)
The final assembly is simple with some screws. I have not used glue to replace parts if broken.
The connectiosn are simple. You need to use one driver for each motor. Each driver need power supply to work. I use a 24V 15A power supply. I select in the drivers my motors amperage. The A+, A-, B+, B- correspond with each of two coils of the motors and his poles. CLK+ (Clock) connects with the step pin on Arduino, CW+ (Clock Wise) connects to direction pin, CLK- and CW- connects to GND pin. EN+ and EN- not need to connect.
In the link below are the Arduino pin diagram of GRBL and some descriptions.
I see this video to load GRBL on Arduino Uno R3. In the description of this are the links to the programs and files of GRBL. Is very simple. With XLoader load the GRBL code (grbl_v0_8c_atmega328p_16mhz_9600. hex) on your arduino, then open GCodeSender to conect your Arduino to your pc and it's ready to use.
This video explains how to configure GRBL according your stepper motors.
You can use any CAD program to design your projects and CAM programs to machining the GCode for different needs work. I use MasterCam X7 that is CAD and CAM program.
And this is the final result and I hope you like it.
Thanks so much for watch this instructable and enjoy!