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# Forging new generations of engineers

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.

## Forging new generations of engineers

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### Presentation Transcript

1. Forging new generations of engineers

2. Gear Cutting

3. 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

4. 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

5. Gear Tooth Parts

6. Gear Cutting Equipment • Metal Lathe • Horizontal Mill • Horizontal Cutoff Saw • Indexing Head • Drill Bit • Gear Involute Cutter • Gear Blank & Mandrel

7. Horizontal Mill Saw Cutoff Band Saw Gear Cutting Equipment

8. Gear Cutting Equipment Metal Lathe Drill Gear ToothGage Gear Blank Gear Cutter Mandrel

9. Horizontal Cutoff Saw Cutting Gear Blank

10. Rough Gear Blank Mounted On A Mandrel

11. Mandrel And Gear Blank Assembly Mounted On The Lathe Turned To Finished Gear Diameter And Thickness

12. 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

13. 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.

14. 20 Hole Indexing Plate Mounted On Indexing Head

15. Horizontal Mill Set Up To Cut Gear

16. Gear Blank Aligned With Gear Involute Cutter

17. Gear Involute Cutter Cutting Gear

18. Checking Finished Gear With Involute Gage

19. Measuring Finished Gear

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