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I use two sketches, one for the revolve axis, and one for the desired shape to do the cut. Next select the helical cut function, and first select the center axis (sketch 1), then select the cut (sketch 2). Now at the right side of the pitch and # turns screen there is a window that is labeled "more". Select the more buton. Now you will see the words taper and pitch, taper is where you will enter your desired number. Hope this helps!!