At last, I would check your power supply to be sure that you are providing the correct voltage and current to your motor: this may be another reason why your motors are turning slowly. This is why, maybe, your motors are turning slowly. Adjust to whatever rate gets to the limit. Moreover, once you have done your math, maybe, you will realize that your parameters are too high for your machine and the stepper motors simply are not able to keep up with the high rate of pulses that you are sending to them. GRBL defaults to 0 to 1000 for newer versions of GRBL, or 0 to 255 for older ones. Homing seek rate is the homing cycle search rate, or the rate at which it first tries to find the limit switches.
You are ready now to do your math to adapt the variable settings to your hardware. Reporting units are independent of the units set in the Gcode Grbl Supported GCodes NOTE: Codes can contain leading zeros, G0 and G00 are the same. Change if an axis is moving in the wrong direction. Then see the diameter of your pulleys to calculate the linear movement done by the machine for one revolution of your stepper motor. Grbl Settings XYZmask is a value setting for the X Y and Z axes. Set the baud rate to 115200 as 8-N-1 (8-bits, no parity, and 1-stop bit.) Once connected you should get the Grbl-prompt, which looks like this: Grbl 1.1d for help Type and press enter to have Grbl print a help message.
Second you need to check the number of steps per revolution of your stepper motor (usually is 200, but are commonly used also 4,8,16.400 variants). First, connect to Grbl using the serial terminal of your choice. First I would check your hardware juper setup since usually it is possible to use the so called microsteps that in fact multiplies the number of steps needed for 1 stepper motor revolution by 2,4,8,16. If a program tries to set a higher spindle RPM greater than the 30 max spindle speed, Grbl will just output the max 5V.
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