Drive Ratio

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Ratio of wheel diameter to flyer whorl diameter (or bobbin whorl on a bobbin lead wheel). Governs how much twist you get in the yarn for each treadle. To measure your wheel ratios, set up your wheel, tie a bright-colored piece of yarn to your flyer arm, and adjust the treadle until it is at the bottom of its movement. Slowly rotate the wheel, while counting the flyer revolutions until the treadle returns to it’s original point. The bright yarn tied to the flyer arm just makes it easier to count

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