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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1 In Word 2007, click the Microsoft Office Button, and then click Open. 2  In Word 2010, click the File Menu, and then click Open. 3  In the Files of type box, click Recover Text from Any File(*.*) . 4  Click the document from which you want to recover the text.tep 1: Determine the template that is used by the document. 1  Open the problem document in Word. 2  In Word 2007, click the Microsoft Office Button, and then click Options. 3  In Word 2010, click File on the Ribbon, and then click Options. 4  Click Add-Ins.