ADDENDUM (a) is the height by which a tooth projects beyond the pitch circle or pitch line. BASE DIAMETER (Db) is the diameter of the base cylinder from which the involute portion of a tooth profile is generated. BACKLASH (B) is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles. As actually indicated by measuring devices, backlash may be determined variously in the transverse, normal, or axial-planes, and either in the direction of the pitch circles or on the line of action.
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Click here to view the entire training tutorial! Recovering Unsaved Documents. A new feature in Word 2013 allows you to attempt to recover unsaved document files. If you want to see if Word has automatically saved a copy of an unsaved document that you were working on, then:1  Select the âFileâ tab within the Ribbon and click the âOpenâ command at the left side of the backstage view. 2  In the area to the right of the command panel, select the âRecent Documentsâ command.f you want to see if Word has automatically saved a copy of an unsaved document that you were working on, then: 1  Select the âFileâ tab within the Ribbon and click the âOpenâ command at the left side of the backstage view.