CNC mill with dual Y axis has issue with Z axis

[chrisgtownsend-dev]

I am running nema 23's for x and dual y axis and using a nema 17 for z. I have wired external stepper motors for each of the nema 23s and are using HR9888 for the z. This is what I've updated in config.h:

#define N_AXIS 4 // Number of axes (3 to 6)
#define N_AXIS_LINEAR 4 // Number of linears axis, must be <= N_AXIS

// Axis indexing and names
#define AXIS_1 0 // Axis indexing value. Must start with 0 and be continuous.
#define AXIS_1_NAME 'X' // Axis names must be in X, Y, Z, A, B, C, U, V, W, D, E & H.
#define AXIS_2 1
#define AXIS_2_NAME 'Y'
#define AXIS_3 2
#define AXIS_3_NAME 'Y'
#if N_AXIS <3
#error "N_AXIS must be >= 3. N_AXIS < 3 is not implemented."
#endif
#if N_AXIS > 3
#define AXIS_4 3
#define AXIS_4_NAME 'Z' // Letter of axis number 4

I'm using arduino serial monitor to test.

The issue I have is with Z motor just stuttering when I send a command. I can confirm that all axis move and work, and I can switch the stepper driver and motor wires to the X slot and it works fine.

I'm curious if there is an issue with E0 sending commands for Z?

Do I just need to leave Axis 3 as Z and label Axis 4 as Y?

[chrisgtownsend-dev]

I solved it, it was a mismatch in the steps per mm