Stepper motor input pulse problem

Question

Hello
I've purchased 4 autonics a41k-m599 model 5-phase stepper motors and 4 MD5-MF14 model drivers. I want to pulse the drivers via parallel port with c++. Now I have some serious problem, first I can't get a higher speed than 666 pps (1500 microseconds interval), second and more important when I send pulse to driver I see motors rotate smoothly but in some moments (and not regularly) they produce some small pauses which result in some small shakes or vibrations. Here I send you a scrap of my c++ code:
// ten cycle
    for(int iLoop = 0; iLoop < 10; iLoop++) {
        // 500 step to complete a cycle (each step is 0.72 degree)
        for(int j = 0; j < 500; j++) {
            outp(LPT1, HIGH);    // send HIGH to CW through LPT1
            outp(LPT1, LOW);    // send LOW to CW through LPT1
            DelayMicroSleep(1500);    // delay 1500 microseconds as pulse interval
Here's a picture of my driver's time chart and input pulse specifications:
http://lh4.ggpht.com/_sFND_wFW_Qo/SttpJRzLpKI/AAAAAAAACGA/uRNWYH519dU/s800/StepperMotorTimeChartPuls...
So now what could be the problem?

Answer 1

Should you not have a delay between sending the high and low pulse? Otherwise the pulse will happen very quickly.
// ten cycle
    for(int iLoop = 0; iLoop < 10; iLoop++) {
        // 500 step to complete a cycle (each step is 0.72 degree)
        for(int j = 0; j < 500; j++) {
            outp(LPT1, HIGH);    // send HIGH to CW through LPT1
            DelayMicroSleep(hightime);
            outp(LPT1, LOW);    // send LOW to CW through LPT1
            DelayMicroSleep(1500);    // delay 1500 microseconds as pulse interval
nrp
CLA