I'm in the process of building a 450x450mm Grbl Mill
Uno with Grbl sheild
Drv8825 drivers
Nema 23 stepper 2.5a
5mm pitch ball screws.
I cant get the thing to go beyond 1000mm/min rates. I have been all over the board with the Grbl settings.
I plan to machine at 50-75in/min and it wont rapid half that speed.
Driver set to full steps.
vref 1.25
If I go above 1000mm/min it stalls. if I touch the ball screw at 900mm/min it stalls.
No binding, everything moves free manually.
If I run a program just stroking a axis (G0X0;G0X450.00. repeat) neither the driver or stepper gets above ambient temp.
I would think if i'm pushing it too hard the drive would at least get warm if not HOT....
Any ideas?