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Forging new generations of engineers. Gear Cutting. Making Gears. Gear cutting equipment Preparing a gear blank Gear involute cutters Cutting a spur gear Identify current gear uses Apply gear knowledge to real situations. Diametral Pitch.

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## Forging new generations of engineers

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**MakingGears**• Gear cutting equipment • Preparing a gear blank • Gear involute cutters • Cutting a spur gear • Identify current gear uses • Apply gear knowledge to real situations**Diametral Pitch**Diametral Pitch is the actual size of the gear tooth.The lower the number the larger the tooth.The chart at left shows 3 dp. as larger tooth and 20 dp as the smallest tooth. 3 dp 20 dp**Gear Cutting Equipment**• Metal Lathe • Horizontal Mill • Horizontal Cutoff Saw • Indexing Head • Drill Bit • Gear Involute Cutter • Gear Blank & Mandrel**Horizontal Mill Saw**Cutoff Band Saw Gear Cutting Equipment**Gear Cutting Equipment**Metal Lathe Drill Gear ToothGage Gear Blank Gear Cutter Mandrel**Horizontal Cutoff Saw**Cutting Gear Blank**Metal Lathe Used To Face Sides Of Gear Blank And Drill A**1” Hole**Mandrel And Gear Blank Assembly Mounted On The Lathe**Turned To Finished Gear Diameter And Thickness**Indexing Head Used To Exactly Position Gear Blank To Cut**Each Tooth**Math Gear Calculations**• 16 Diametral Pitch X 2 Inch Diameter Gear Blank Equals Number Of Teeth • N = D.P. X D.G. N = 16 X 2 N = 32 Teeth • 40 Turns Of The Dividing Head Hand Crank Equals 1 Revolution Of The Gear Blank • Turns = 40/32 = 10/8 = 5/4 = 1 And 1/4 Turns**Math Gear Calculations**• Using a 20 hole plate 1/4 turn = 20/4 = 5 spaces or 6 holes in plate. This moves our gear blank 1 and 1/4 turns. • Outside diameter of gear = 32th + 2/16 =2.125 • Cutting depth for tooth = 2.250 a constant divided by d.P. • Depth = 2.250/16 = .140 thousands for depth of cut.**Horizontal Mill Set Up With Indexing Head, Mandrel & Gear**Blank

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