I am using Mach3 on Windows 7. The hardware is A4988 (stepper driver) and a small stepper motor taken from photocopier. I am using 12VDC and printer port.
The Motor Turning setup is:
Steps per unit >5080
Velocity > 6
Acceleration > 0.6
Step pulse (1-5 us) > 0
This setting works fine. But whenever I try to increase Velocity e.g. 10 or 15 or 20. The motor turns with only Velocity (6). I mean that I increase the velocity in Motor Turning Setup, but in practice it does not increase and it remain 6. I also tried to increase Step pulse (1-5 us) e.g. 1, 3, 5. But the velocity does not increase more than 6.
I also used 555 timer based step pulse generator in place of Mach3. When using 555 timer based step pulse generator, the motor turns with more than 6 Velocity and the motor run faster.
I could not figure out the problem. Using Mach3, the velocity should increase. Is there any problem with Mach3, printer port or computer itself?