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INST 6150 Communication Instruction and the Learning Process INTRODUCTION TO GEARS.

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Presentation on theme: "INST 6150 Communication Instruction and the Learning Process INTRODUCTION TO GEARS."— Presentation transcript:

1 INST 6150 Communication Instruction and the Learning Process INTRODUCTION TO GEARS

2 GEARS Transmit motion between shafts Gear types –Spur gears – parallel shafts – most common –Bevel gears – perpendicular shafts –Worm gears - perpendicular overlapping shafts –Rack and pinion gears – convert circular motion to linear motion

3 GEARS SPUR GEAR WORM GEAR BEVEL GEAR

4 GEAR TERMINOLOGY DIAMETRAL PITCH =P = Tooth size = # teeth per inch of pitch diameter PITCH DIAMETER =D = Design diameter of gear if it were a smooth wheel NUMBER OF TEETH =N = Total number of teeth on any given gear. Must be a whole number. CENTER DISTANCE (Center-to-Center Distance) = Distance between centers of two mating gears GEAR RATIO = Ratio of number of teeth on one gear to number of teeth on the mating gear

5 GEAR TERMINOLOGY PITCH DIAMETER ROOT DIAMETER CENTER DISTANCE OUTSIDE DIAMETER DIAMETRAL PITCH = TOOTH SIZE

6 MATING SPUR GEARS CENTER-TO-CENTER DISTANCE TANGENT PITCH CIRCLES D1 + D2 2 = CC DIST D1 D2 COMPARE TOOTH SIZES

7 DIAMETRAL PITCH NUMBER OF TEETH PER INCH OF PITCH DIAMETER EXAMPLE: Gear has 18 teeth and a pitch diameter of 2.25. Diametral Pitch (tooth size) = 18 teeth/2.25 = 8 P = 8 P = = 18 TEETH 2.25 INCHES ? TEETH 1 INCH 2.25 = 18 TEETH

8 THE GEAR DESIGN FORMULA D = NPNP (or N = DP, or P = N/D)

9 GEAR RATIO Ratio of number of teeth on one gear to number of teeth on the mating gear Ratio = 9/18, or 1/2Ratio = 25/18

10 EXAMPLES A gear has 18 teeth (N) and a diametral pitch (P) of 8. What is its pitch diameter (D) ? 2.25 (2-1/4) A gear has a pitch diameter (D) of 3.125 (3-1/8) and a diametral pitch (P) of 8. How many teeth (N) does it have? 25 teeth Two mating gears have N = 30, P = 6, and N = 24, P = 6, respectively. What is the center distance? 4.50 (4-1/2) Two mating gears have D = 3, P = 7, and D = 5, P = 7, respectively. What is the gear ratio? 21/35, or 3/5

11 THE END CREDITS An I WANT MY M.A.W.W. production Producer-Inverted-Bird Productions Director-Dave Deadeye Manning Technical Consultants-Don The Wrench Wilson Kent Flame Walker Special Effects-AustinWorks Inc. Copywrong 2005 All Wrongs Reserved

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