I cannot say I tried everything back when I was experimenting with getting my Galil lathe threading program working, but I did find a lot of variance in the response time of the card to using high speed latches and I don't know what else.
That was why I ended up feeding the spindle encoder index back into one of the inputs on the Galil card and used the AI command to detect the index on this input. Now whatever the Galil does between detection and initiation of motion, I don't really know, but the AI logic was the only sequence that seemed to be exactly uniform in response time.
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First you get good, then you get fast. Then grouchiness sets in.
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