wade extruder problem

Hey guys,
I am using wade extruder connected to ramps 1.4 and pololu 4988.
Motor by it self is working correctly, but when is attached to extruder after a while is reversing direction pulling out the filament..
Our setting in

//// Calibration variables
// X, Y, Z, E steps per unit - Metric Prusa Mendel with Wade extruder:
#define _AXIS_STEP_PER_UNIT {80, 80, 3200/1.75,700}

const int NUM_AXIS = 4; // The axis order in all axis related arrays is X, Y, Z, E
#define _MAX_FEEDRATE {400, 400, 0.5, 45} // (mm/sec)
#define _HOMING_FEEDRATE {1500,1500,120} // (mm/min) !!
#define _AXIS_RELATIVE_MODES {false, false, false, false}

// X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.
#define _ACCELERATION 1000 // Axis Normal acceleration mm/s^2
#define _RETRACT_ACCELERATION 2000 // Extruder Normal acceleration mm/s^2
#define _MAX_XY_JERK 20.0
#define _MAX_Z_JERK 0.2
#define _MAX_E_JERK 5.0 // (mm/sec)
//#define _MAX_START_SPEED_UNITS_PER_SECOND {25.0,25.0,0.2,10.0}
#define _MAX_ACCELERATION_UNITS_PER_SQ_SECOND {5000,5000,3,5000} // X, Y, Z and E max acceleration in mm/s^2 for printing moves or retracts

Do you know what could be the problem ? ?
Many thanks

Quote
klakierka
Hey guys,
I am using wade extruder connected to ramps 1.4 and pololu 4988.
Motor by it self is working correctly, but when is attached to extruder after a while is reversing direction pulling out the filament..


Do you know what could be the problem ? ?
Many thanks

Check your motor wires at the plug. Sounds like you have a broken or loose connection that is making and breaking.

---

[regpye.com.au]
"Experience is the mother of all knowledge." --Leonardo da Vinci

I will check cables connection once again.
However when we plug only motor everything is working well.
Problems starts with extruder is attached. So it seems that cables are ok.

Your extruder should have nothing to do with your hot end - they are not connected electronically except that they are both connected to the controller board. They are controlled via separate arduino output pins..

I had an issue once where the extruder was changing directions. I replaced the pololu 4988 and all was well again. These drivers are a bit sensitive, so I always keep a few extra on hand.

Edited 1 time(s). Last edit at 05/14/2014 11:12AM by jbernardis.

Also check the current running to the stepper motor. It may be that the added work of pushing plastic through the extruder requires more current than you're giving. Stepper motors behave very oddly (including turning backwards) when they don't get enough juice.