X2 and Y1 motors move twice as fast as X1 and Y2

Mostly Printed CNC - MPCNC Troubleshooting
1

Hi, I need help fixing my new MPCNC

I uploaded the firmware from Github (https://github.com/Allted/Marlin/tree/MPCNC_Ramps_T8_16T_LCD_32step_DualEndstop)

These are the lines that I needed to edit

Configuration.h

#define X_MIN_ENDSTOP_INVERTING true // using hall sensor endtops
#define Y_MIN_ENDSTOP_INVERTING true
#define X_MAX_ENDSTOP_INVERTING true
#define Y_MAX_ENDSTOP_INVERTING true

#define DEFAULT_AXIS_STEPS_PER_UNIT { 200, 200, 5120, 200 } // M8 threaded rod

#define INVERT_Y_DIR false

Configuration_adv.h

#define INVERT_X2_VS_X_DIR false // Y axis motors were moving in the opposite direction

 

Now for some reason one motor in each of the X and Y axis moves twice as fast as the other motor in the same axis.

 

2

Why did you change the direction. I would start by putting those back and just physically flipping the plugs.

Your endstops should also have an option for either logic, I think they have a jumper, I haven’t used those in years though.

The dual has a ton of changes, for the most part it works as it should but I think you should start with just one change at a time and see what actually causes the issue, we are the only ones using it so beyond my standard settings I doubt any of the other logic has been confirmed. Your config-adv change does not ring a bell for me I don’t know what that does, it looks like you have reversed the Y axis twice?

 

1 Like
3

What did you set the jumpers under your drivers to when installing them for the second X and Y steppers? Which drivers did you use? If they aren’t set to the same 1/32 or the new ones are 4988 instead of 8825 it would give those symptoms.

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4
What did you set the jumpers under your drivers
Yes! I'm using DRV8825s and two jumpers were missing due to an old usage of A4988 in the extruders, thank you!
Your endstops should also have an option for either logic
For this I used a simple A3144 wired directly to RAMPS, not the PCB endstop
it looks like you have reversed the Y axis twice?
I came up to this empirically, I believe one inverts if they go against each other which mine did (INVERT_X2_VS_X_DIR), the other inverts the + - of the axis (INVERT_Y_DIR)