After more research i realize i was incorrect in my statement.  As i said i am new at this. thanks again and i will give it a try.

Hi
please post a screenshot of DriverTest.exe.

Craig

After setting motor tuning to your recommendations fine tuning (X axis) , its the best its done but i can run the mach 3 demo maybe 3 times without any problems but the next 3 times it will stall or have what sounds like vibration. it does it at no certain place in program. Check the volts while running nothing drops. When motor is running for several seconds in program without changing directions , the motor sounds like it is changing rpms, not a lot but just enough to hear. I tried the Y and A axis without any success. After trying Y and A and going back to the X axis had to fine tune again. 

I am having trouble loading the pic of the driver test still working on that.

Ricky,
What is your PC spec. Is it a laptop or a desktop?
What is your CPU model and size of RAM and Video Card.
If you have a good CPU on desktop, try to increase the Kernel Speed to 35,000 or even higher.
My Win 7 can run at 100,000 with no problem because I have a Quad Core I5 7600 running at 3.5GHz. I can even reduce the step and direction to 2 and 2 and run at 4,000mm/min. With my older PC, core-2 duo running at 3Ghz, I can only run smoothly at 35,000 kernel speed but my pulse and dir usec had to be set at 10 and 5 otherwise motor will stall when G0 is executed. Also max speed had to be reduced to 1800mm/min
With my 2GHz laptop, I can only run at max speed of 1200mm/min (about 47inches per minute)

Time is money so a GOOD CPU will save you a lot of money and headaches.

it is a desktop, don't know model and size, not looking at right now, but will try to increase the kernel speed. thanks, headache is right.

Hi,
the main data to be retrieved by DriverTest.exe is the timing jitter of the interrupt timer. On most
PC's on which I have run Mach's parallel port the jitter is about 4us.

If you have Mach's kernel speed set to 25kHz the period is 40us. The jitter is therefore 10% of the period.
If you set the kernel speed to 35kHz with the same 4us jitter the percentage is 14%, ie worse.

The Mach wisdom passed down is that 'run Mach at the lowest kernel speed consistent with the minimum required
to meet the maximum output pulse train determined by the motor tuning'. Mach's parallel port runs more smoothly at lower
kernel speeds not higher.

Craig

here is the driver test screen.

Hi,
that is a very good plot. The average jitter is 3.2 us which is very good.

I would expect this PC to run smoothly.

Craig

so does that indicate that my problem would be in the software or maybe the breakout board? just trying to narrow it down.