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In this video we look at the geometry of involute gearing. We take a closer look at the different dimensions such as module, pitch circle diameter, pitch circle diameter, circumferential pitch, meshing pitch, etc. The involute is created by rolling a straight line on a base circle. The resulting tooth shape leads to favorable meshing conditions when two gears mesh. 00:00 Application of involute gears 00:43 Construction of an involute by unrolling a thread 01:28 Nomenclature (tooth tip, tooth root, tooth base, root circle, tip circle, pitch circle) 02:51 The tooth size: the module 04:16 The gear size: the pitch circle diameter 05:38 Circumferential pitch 06:18 Module as diameter pitch 06:57 Tip circle diameter & tooth root diameter 07:54 Tooth gap & tooth thickness on the pitch circle 08:38 Zero center distance (standard center distance) 09:32 Difference between pitch circle and pitch circle