To learn more about the living history of Mount Jackson, stop by the Mount Jackson Museum, located in Town Center. For stories of the history of our surrounding area, visit the Shenandoah County Historical Society online. An issue of Cooperative Magazine features Mount Jackson.
What is backlash in gear terms? The term backlash is defined as the amount by which a tooth space exceeds the thickness of a gear tooth engaged in mesh. It is necessary to ensure the smooth rotation of meshed gears. The following extract is from the KHK Gear Catalogue* which details the types of backlashes, the relationships between backlashes and the fundamental equations, as well as easy-to-understand illustrations of how it all works.
most often occurs in gears with small numbers of teeth and low pressure angles. Circular Tooth Thickness is the distance from a point on one side of a gear tooth to a corresponding point on the opposite side of the same tooth, measured along the pitch circle. Backlash is the amount by which the width of a tooth space exceeds the thickness of the engaging gear tooth. Backlash is achieved either by decreasing tooth thickness slightly (increasing tooth space) on one or both