From Shopbot Wiki

The Indexer Virtual Tool doesn't have a box for pitch, but it just takes some straightforward calculations to get there. If you want a pitch of 9 (i.e. one spiral every 9 inches) on a 30 inch turning, you would just set up an equation, 1/9 = x/30. The answer is 3.33 which you would plug into the Indexer software box for "number of times pattern wraps around work". Making this number positive makes the spirals clockwise and making them negative makes them counterclockwise.

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