Stepper motors not working Hello, i am making a 3d printer and i have a big problem. When i try to move x or y axis from Pronterface motors just buzz and doesnt move(nema 17 with 4988 and ramps 1.4) Z axis works fine. I check with led the wiring and its ok. I switched the motors with z axis and they work, i swichted drivers too and they work. Extruder motor works too. Vref is 0.6v on all drivers. With this setting #define DEFAULT_AXIS_STEPS_PER_UNIT { 320, 320, 1600, 388.3496 } it only buzzez. With default #define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 500 } it move a bit but not as it should. https://reprap.org/forum/read.php?262,895797,895797#msg-895797 Sun, 09 Aug 2026 18:10:26 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?262,895797,895803#msg-895803 Re: Stepper motors not working https://reprap.org/forum/read.php?262,895797,895803#msg-895803 Cosmin35 Printing Fri, 20 Sep 2024 08:18:32 -0400 https://reprap.org/forum/read.php?262,895797,895802#msg-895802 Re: Stepper motors not working https://reprap.org/forum/read.php?262,895797,895802#msg-895802
These are the Jumpers for a A4988 (Jumper off = LOW)
[attachment 121119 A4988_micro_stepping.png]

But your steps/mm is rather high for a old 8 bit controller.


3 factors are involved in moving.

Steps/mm (and microstepping)
Feedrate
Stepper driver current. (adjusted via the variable resistors on the A4988's, set to match your stepper motor current))]]> Dust Printing Fri, 20 Sep 2024 07:23:54 -0400 https://reprap.org/forum/read.php?262,895797,895801#msg-895801 Re: Stepper motors not working https://reprap.org/forum/read.php?262,895797,895801#msg-895801 Cosmin35 Printing Fri, 20 Sep 2024 06:55:09 -0400 https://reprap.org/forum/read.php?262,895797,895799#msg-895799 Re: Stepper motors not working https://reprap.org/forum/read.php?262,895797,895799#msg-895799 Dust Printing Fri, 20 Sep 2024 06:36:07 -0400 https://reprap.org/forum/read.php?262,895797,895797#msg-895797 Stepper motors not working https://reprap.org/forum/read.php?262,895797,895797#msg-895797 With this setting #define DEFAULT_AXIS_STEPS_PER_UNIT { 320, 320, 1600, 388.3496 } it only buzzez.
With default #define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 400, 500 } it move a bit but not as it should.]]> Cosmin35 Printing Fri, 20 Sep 2024 04:54:53 -0400