John Thornton wrote: > Jon, > > What is FF0 used for if it should be set to 0 for a motion axis? > I used to think it was useless, but if you use the PID for a spindle speed control, for instance, then it is quite useful for a velocity servo. It serves about the same purpose as FF1 in a positioning servo. In a positioning servo, it would add an offset proportional to position. In a velocity servo, it would add an offset proportional to speed, thereby correcting for finite gain in the loop.
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