Ok. Now forgive me for reviving it. But I think it is worth it to close it for good. After all if any newcomer seeks the answer, what a loss to go through 132 replies long and yet get no answer 
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So what is correct chain pitch? The answer would be that chains exact pitch do vary with batches and wear. So that has to be calibrated for a MaslowCNC to be accurate, and is essential to reduce workarea warping. See list of sources of errors.