"The machine seems to be working when I use 10ns for step and 5ns for
> Do you mean microseconds or nanoseconds? It is possible that the
> system will work with nanoseconds specified, but only because the
> parallel port can't do nanosecond pulses and will end up outputting
> the shortest pulses it can manage. If you are lucky those will be long
My mistake, the numbers input in nanoseconds 10,000 and 5,000 I meant 10 microseconds and 5 microseconds. With measured jitter the base period came out at 22,000.
I won't assume that I won't be needing high step rates, given drive ratios etc, but my intuition tells me that I'm not asking for a lot. Thanks Chris!
And with regard to opto-isolators, I have installed a KL-DB25RS, 6 axis board with isolators:
As I can't see any spec for the opto-isolators, I'm liking Gene's suggestion of setting up a deliberate test to see the point of failure. Sounds useful for my first machine, too! We put very conservative values on acceleration and speed on it, and by upping those I suspect we could make a meaningful improvement to the bottom line.