CNC Router GRBL

This is my project in development... Tip me to help in project...

Another Youtube video (boat propeller) https://www.youtube.com/watch?v=IhD9yZsdmfc

New Youtube video https://www.youtube.com/watch?v=VfUzdq0PCpA

Youtube video https://youtu.be/ROgMlOtDJj4

Another Youtube video https://youtu.be/xeLBXyiNdO4

I recommend size X400 Y700 total size...

I actual use for spindle Dremel 3000.

Soon i put new pictures.

Material:
8 LM8UU Linear Bearing
4 LM12UU Linear Bearing (new version Y axis)
7 Ball bearing
M8 threat rod
8mm inox rod
12mm inox rod (new version Y axis)
4 NEMA17 stepper motor 200steps/rev (1.8º step angle)
1 For spindle CNC Router 300w (12000 RPM)
1 Arduino Uno
1 Arduino CNC shield GRBL
4 Pololu A4988
4 Join aluminium for stepper motors to threat rod

Softw