Stepper Motors are not moving in Negative direction...

I am using a printer similar to Prusa I3...when the Printer is connected,i cant move the hot end in negative direction even in manually mode.
I tried making trial part(20mm cube)..while all the temperature met ,and hotend moved to home..
then it moves towards the print area ...and starts making the boundary of th print....till this time hotend moved only in positve direction....the movement it has to moved in -ve ) direction....
hotend stopped........ i tried many times ,then i realised the printer never moves in negative direction...
i am suspecting some mistake in firmware script(sprinter's configuration file)
please help...

You said, "and hotend moved to home" ?

..and then said, "printer never moves in negative direction"

Please clarify.

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_______________________________________
Waitaki 3D Printer

Hi , Waitaki
i m using Proterface.
when i click on either X,Y or Z home button, the nozzle moves towards left,back and up respectively..
similarly when i click +10X,+10Y or +10Z ,the nozzle moves 10mm towards left,back and up respectively..
endstops will switch on when nozzle moves extreme left in X axis, in Y axis bed moves backward, and in Z axiz bed moves upward...
but nothing moves when i give -10 X ,Y or Z command.

Printer settings:
//// ENDSTOP SETTINGS:
//-----------------------------------------------------------------------
// Sets direction of endstops when homing; 1=MAX, -1=MIN
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1
//#define ENDSTOPS_ONLY_FOR_HOMING // If defined the endstops will only be used for homing

const bool min_software_endstops = false; //If true, axis won't move to coordinates less than zero.
const bool max_software_endstops = true; //If true, axis won't move to coordinates greater than the defined lengths below.

Edited 1 time(s). Last edit at 12/16/2014 09:55AM by Sandeep Dohare.

Does it move the negative way after you have manually triggered the endstop?

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http://www.marinusdebeer.nl/

yes it moves back when it triggers the end stop...

just now i change setting to:
//// ENDSTOP SETTINGS:
//-----------------------------------------------------------------------
// Sets direction of endstops when homing; 1=MAX, -1=MIN
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1
#define ENDSTOPS_ONLY_FOR_HOMING // If defined the endstops will only be used for homing

then it moves in both directions ,
but on giving home command it moves away from endstops...thats mean home command wont trigger the end stops at all.

then i changed setting to:
#define X_HOME_DIR 1
#define Y_HOME_DIR 1
#define Z_HOME_DIR 1

result: home command doing nothing.

hi there,


Problem source is your limit swith connections. please check your LS cables. problem probably occurs because of loose control in your cables.

please check and tell the result.

Edited 1 time(s). Last edit at 12/16/2014 03:51PM by RDEng.

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Custom 3D Printer,

Mechanical Engineer

HI, thanks for reply
i have checked all connections...
and i have print 2 parts also by excluding the home command from the gcode.
but for that i have to manually postion the hotend at (0,0,0).

1. My doubt is whether the direction of home and the motion in postive directions are same?
2. Since my X,Y,Z motion is correct i,e towards right X +ve,hotend going back Y+ve and Heat bed going down is Z+ve,but why then on giving homing command hotend moves to POSITIVE directions?