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E stepper chatter and feed problem

Posted by tivkin 
E stepper chatter and feed problem
July 22, 2013 10:22AM
I am having issues with the extruder stepper motor. It is not feeding the filament smoothly. The motor chatters on small movements and I have to feed the filament in to get it to extrude.
I've played with the tension bolts for the feeder but I'm not sure what is going on.

Here is a pic of the issue...Poor Android

Edited 2 time(s). Last edit at 07/23/2013 08:13AM by tivkin.


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Reprap MendelMax Build photos: [geotrinket.com]
Re: Z stepper chatter and feed problem
July 22, 2013 11:00AM
I had that too recently and it turned out to be a combination of firmware settings and
too little/much speed. Try looking at your firmware settings and make sure your stepper
voltage isn't too low or high, could be a lot of things.
Re: Z stepper chatter and feed problem
July 22, 2013 11:01AM
BTW that's not a z stepper that's e smiling smiley
Re: E stepper chatter and feed problem
July 23, 2013 08:15AM
Here is the section of my config file that I'm trying to dial in. How do you test/tweak this?
My hotend: J-Head Mk IV-B Hot End for 3mm filament
// default settings
#define DEFAULT_AXIS_STEPS_PER_UNIT   {81.4830, 81.4830, 2015.7480, 759.9017}  // per [kurtsmendelmax1-5.blogspot.com]
//#define DEFAULT_AXIS_STEPS_PER_UNIT   {78.7402,78.7402,200.0*8/3,760*1.1}  // default steps per unit for ultimaker
//#define axis_steps_per_unit[] = {52.4934, 52.4934, 3200/1.25, 1487 / 1.1}; 
//#define DEFAULT_AXIS_STEPS_PER_UNIT   {16*5.000*1.0101,16*5.0000*1.0154,16*200/2,760*1.0905} //2 mm acme Z rod
#define DEFAULT_MAX_FEEDRATE          {500, 500, 5, 25}    // (mm/sec)
#define DEFAULT_MAX_ACCELERATION      {9000,9000,100,10000}    // 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 DEFAULT_ACCELERATION          3000    // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION  3000   // X, Y, Z and E max acceleration in mm/s^2 for r retracts

Edited 1 time(s). Last edit at 07/23/2013 08:16AM by tivkin.
Re: E stepper chatter and feed problem
July 23, 2013 09:40AM
Update: Noob error. I had the extruder motor bolt to tight and it was binding. Now dialing in the configuration.h file.
Re: E stepper chatter and feed problem
July 24, 2013 07:29AM
Yes I ahd the same issue ... my hobbed bolt was too tight. Once I loosened it all was well...
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