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Yes, Mr. Guffey, there is a conversion for fractional adjustments converted to thousandths. Multiply the fraction of die rotation by 1/14 and the answer's exact. 1/4 x 1/14 = 0.0178571428571429". .018" for 1/4 turn of the die is close enough for reloaders' use. 1/7th of a turn moves the die 0.0102040816326531"; .010" for all practical reloading use.
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Exactly. The only way that a "distance per fractional revolution" conversion isn't going to be accurate is if the thread pitch isn't consistent. And if the thread pitch isn't consistent, the die would bind up and wouldn't thread.