Torque problem

hi hope can me out, i'm using arduino, easystepper , nema 17 steppermotor.

everything works when press te push button motor turns, when put pressure on motorshaft has no power can holt hand.

here below code , in attachmend layout wiring. maybe missing something??   

code: [select]

#define distance 100


int stepcounter = 30;

int stepping = false;


void setup() {               

  pinmode(8, output);     

  pinmode(9, output);

  digitalwrite(8, low);

  digitalwrite(9, low);


  pinmode(3,input);

}


void loop() {

  if (digitalread(3) == low && stepping == false)

  {

    stepping = true;

  }


  if (stepping == true)

  {

    digitalwrite(9, high);

    delaymicroseconds(500);         

    digitalwrite(9, low);

    delaymicroseconds(500);


    stepcounter = stepcounter + 1;


    if (stepcounter == distance)

    {

      stepcounter = 0;

      stepping = false;

    }

  }

}

you got right voltage on m+ suit motor?

(afaik, nema numbers have nothing motor's electrical / mechanical characteristics, mean layout of mounting holes.)

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