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Blueprint Reading for the Machine Trades, Sixth Edition Unit 15: Spur Gear Terminology

Blueprint Reading for the Machine Trades, Sixth Edition Unit 15: Spur Gear Terminology. Russ Schultz and Larry Smith PowerPoint presentation created by LaVonne Vichlach. Spur Gear Terminology. Addendum-radial distance on tooth from pitch circle to outside circle

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Blueprint Reading for the Machine Trades, Sixth Edition Unit 15: Spur Gear Terminology

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  1. Blueprint Reading for the Machine Trades, Sixth Edition Unit 15: Spur Gear Terminology Russ Schultz and Larry Smith PowerPoint presentation created by LaVonne Vichlach

  2. Spur Gear Terminology • Addendum-radial distance on tooth from pitch circle to outside circle • Center distance-center-to-center distance between axes of two meshing gears • Chordal addendum-radial distance from the top of the tooth to the chord of the pitch circle

  3. Spur Gear Terminology • Chordal thickness-length of chord along the pitch circle between the two sides of the tooth • Circular pitch-length of pitch circle arc between corresponding points of adjacent teeth • Circular thickness-thickness of tooth measured along chord of pitch circle

  4. Spur Gear Terminology • Clearance-distance allowed between top of tooth and bottom of mating tooth space-to avoid interference when meshing • Dedendum-redial distance on tooth from pitch circle to root circle • Diametral pitch-ratio of number of teeth to the number of inches of pitch diameter-mating gears must have same diametral pitch

  5. Spur Gear Terminology • Number of teeth-total quantity of teeth formed along the pitch circle • Outside diameter-maximum diameter • Pitch diameter-diameter of pitch circle

  6. Spur Gear Terminology • Pressure angle-standard angle at which pressure from the tooth of one gear is passed to tooth of another-involute gears use 14 1/2° or 20° • Root diameter-diameter of the root circle

  7. Spur Gear Terminology

  8. Spur Gear Formulas

  9. Spur Gear Terminology

  10. Spur Gear Terminology

  11. Spur Gear 1. What is the outside diameter of the spur gear? 6.500

  12. Spur Gear 2. What is the pitch diameter of the spur gear? 6.00

  13. Spur Gear 3. Are mating spur gear spacings determined by (a) their OD or (b) their PD? (b) their PD

  14. Spur Gear 4. What pressure angle is specified? 20°

  15. Spur Gear 5. Calculate the addendum using the formula on page 357. .25

  16. Spur Gear 6. Calculate the dedendum using the proper formula. .28925

  17. Spur Gear 7. Calculate the root diameter. 5.4215

  18. Spur Gear 8. What is the minimum wall thickness between the bore and the hub? .369

  19. Spur Gear 9. Show the limits of the gear thickness. .995-1.005

  20. Spur Gear 10. What is the thickness of the spokes? .50

  21. Spur Gear 11. What is the width of the keyway? .250

  22. Spur Gear 12. What is the fillet radius? .25

  23. Spur Gear 13. What is the length of each spoke? 1.25

  24. Spur Gear 14. What is the approximate spoke width midway between the hub and the rim? .94

  25. Spur Gear 15. Would a mating gear have a diametral pitch of (a) 4, (b) 5, or (c) 8? (a) 4

  26. Splined Shaft 1. What method of dimensioning was used? dual dimensioning

  27. Splined Shaft 2. What type of section was used on the left side of the shaft? broken-out

  28. Splined Shaft 3. What type of view was drawn to dimension the neck? partial enlarged

  29. Splined Shaft 4. What is the metric diameter of the neck? 11

  30. Splined Shaft 5. What is the outside diameter (inches) of splines A and B? 1.000

  31. Splined Shaft 6. Is the specified material (a) carbon steel or (b) an alloy steel? (a) carbon steel

  32. Splined Shaft 7. How many chamfers are to be machined on the outside? 6

  33. Splined Shaft 8. What pressure angle is specified for the splines? 20°

  34. Splined Shaft 9. Are the spline teeth (a) parallel-sides or (b) involute? (b) involute

  35. Splined Shaft 10. What is the pitch diameter (inches) of the spline? .9286

  36. Splined Shaft 11. What are the metric limits of the shaft length? 177.55 – 178.05

  37. Splined Shaft 12. What is the metric depth of the blind hole? 44.5

  38. Splined Shaft 13. What is the effective length (inches) of spline A? (Include the chamfer.) .75

  39. Splined Shaft 14. What is the length (inches) of spline B? (Include the chamfer.) 1.594

  40. Splined Shaft 15. What is the length (inches) of the .812 Dia? 1.3695

  41. Splined Shaft 16. What is the maximum length (inches) of the 1.125 Dia? 1.52

  42. Splined Shaft 17. What is the minimum length (millimeters) of the .812 Dia? 33.41

  43. Splined Hub 1. How many teeth does the external spline contain? 20

  44. Splined Hub 2. How many teeth does the internal spline contain? 11

  45. Splined Hub 3. What is the maximum OD of the part? 1.738

  46. Splined Hub 4. What is the minimum ID of the part? .6306

  47. Splined Hub 5. What is the pressure angle of the teeth? 20°

  48. Splined Hub 6. Are the spline teeth (a) involute or (b) parallel-sided? (a) involute

  49. Splined Hub 7. What is the diametral pitch of the external spline? 12

  50. Splined Hub 8. What is the diametral pitch of the internal spline? 16

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