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Gear Cutting

Making GearsGear cutting equipmentPreparing a gear blankGear involute cuttersCutting a spur gearIdentify current gear usesApply gear knowledge to real situations

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.Diametral Pitch3 dp20 dp

Gear Tooth Parts

Gear Cutting EquipmentMetal LatheHorizontal MillHorizontal Cutoff SawIndexing HeadDrill BitGear Involute CutterGear Blank & Mandrel

Gear Cutting EquipmentHorizontal Mill SawCutoff Band Saw

Gear Cutting EquipmentMetal LatheDrillGear CutterGear Tooth GageGear BlankMandrel

Horizontal Cutoff SawCutting Gear Blank

Metal Lathe Used To Face Sides Of Gear Blank And Drill A 1 Hole

Rough Gear Blank Mounted On A Mandrel

Mandrel And Gear Blank Assembly Mounted On The LatheTurned To Finished Gear Diameter And Thickness

Indexing Head Used To Exactly Position Gear Blank To Cut Each Tooth

Math Gear Calculations16 Diametral Pitch X 2 Inch Diameter Gear Blank Equals Number Of TeethN = 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 BlankTurns = 40/32 = 10/8 = 5/4 = 1 And 1/4 Turns

Math Gear CalculationsUsing 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.

20 Hole Indexing Plate Mounted On Indexing Head

Horizontal Mill Set Up With Indexing Head, Mandrel & Gear Blank

Horizontal Mill Set Up To Cut Gear

Gear Blank Aligned With Gear Involute Cutter

Gear Involute Cutter Cutting Gear

Checking Finished Gear With Involute Gage

Measuring Finished Gear

Gear CuttingPrinciples of EngineeringTMUnit 4 - Lesson 4.1 - Mechanisms

Project Lead The Way, Inc.Copyright 2007

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