First move in new direction is skipping steps on X-axis
exddc last edited by
First of all, happy new year!
I'm having a problem with my setup of the Duet2 WiFi Board. I have a X-axis with two Nema23 stepper motors moving the Y-axis in parallel via 2 belts separate belts. I use the drivers 0 and 4 for the motors on the X-axis. I hope you can visualize my setup.
So the problem is, when I want to move the X-axis in a new direction, then the motor skips or stalls (not make a noise) on the first move. Every move in the same direction works fine. When I change direction again, same happens on the first move and the following in the same direction work perfectly.
x +10mm- skips and only moves 5mm
x +10mm- works fine and moves 10mm
x -10mm- skips and only moves 5mm
x -10mm- works fine and moves 10mm
No other axis are affected and work perfectly.
I've played with acceleration, micro-stepping, instantaneous speed changes, belt tension.
The thing is, when I disconnect the belt from the Y-axis slider and the belt moves on its own without moving the Y-axis then this problem does not occur. This problem does also not occur when using a different board with Pololu drivers.
I've added the config below, but I'm not finished with the setup.
I hope someone can help me.
Have a nice day
; Configuration file for Duet WiFi (firmware version 1.21) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v2 on Wed Dec 19 2018 20:23:10 GMT+0100 (Central European Standard Time) ; General preferences G90 ; Send absolute coordinates... M83 ; ...but relative extruder moves ; Network M550 P"----" ; Set machine name M551 P"----" ; Set password M552 S1 ; Enable network ;*** Access point is configured manually via M587 M586 P0 S1 ; Enable HTTP M586 P1 S0 ; Disable FTP M586 P2 S0 ; Disable Telnet ; Drives M584 X0:4 Y1 Z2 E3 M569 P0 S0 ; Drive 0 goes backwards M569 P1 S0 ; Drive 1 goes backwards M569 P2 S0 ; Drive 2 goes backwards M569 P3 S1 ; Drive 3 goes forwards M569 P4 S1 ; Drive 4 goes forwards M350 X32 Y32 Z32 E16 I0 ; Configure microstepping without interpolation M92 X64.00 Y88.89 Z1600.00 E415.00 ; Set steps per mm M566 X10.00 Y900.00 Z12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min) M203 X6000.00 Y6000.00 Z300.00 E1200.00 ; Set maximum speeds (mm/min) M201 X10.00 Y500.00 Z20.00 E250.00 ; Set accelerations (mm/s^2) M906 X2400.00 Y1000.00 Z1500.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout ; Axis Limits M208 X0 Y0 Z0 S1 ; Set axis minima M208 X780 Y450 Z800 S0 ; Set axis maxima ; Endstops M574 X1 Y1 S1 ; Set active high endstops ; Z-Probe M558 P0 H5 F120 T6000 ; Disable Z probe but set dive height, probe speed and travel speed M557 X15:11 Y15:195 S20 ; Define mesh grid ; Heaters M140 H-1 ; Disable heated bed M305 P1 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 1 M143 H1 S280 ; Set temperature limit for heater 1 to 280C ; Fans M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off M106 P1 S0 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off ; Tools M563 P0 D0 H1 ; Define tool 0 G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C ; Automatic saving after power loss is not enabled ; Custom settings are not configured
What a strange problem! Which firmware version are you using? Please try 2.02 if you are using an older version.
exddc last edited by
Firmware version 2.01 was installed, I updated to 2.02 but the problem still persists.
I tested some more things. When only one motor (doesn't matter which) is moving the carriage, then the problem is still the same.
But I noticed, only about 5mm of travel is lost. If i move
x +100mmit moves 95mm and following with
x -100mmthe slider stops at 0 again. Same with 50mm and 10mm moves. It moves about 3-5mm stops for some milliseconds and then continues to move the rest of the travel.
All moves following in the same direction are perfectly executed.
I think you have a loose grubscrew in the pulley on the motor shaft.