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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2. Search for the Word Backup File to Recover Deleted Word Document. The next thing you should do is search for the backup file of your word document (.wbk). For this to work, you need to have backups enabled in Word, and you need to know where the document was saved. Open Microsoft word and choose the File tab in the upper left corner. Click on the File tab and choose Open. Choose the folder where your document was last saved in. Select the backup file and click Open. If you canât remember the document location, then make sure to search your entire computer for Word backup files. You can do so by entering *.wbk into Windows Search.