# INST 6150 Communication Instruction and the Learning Process

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INST 6150 Communication Instruction and the Learning Process
INTRODUCTION TO GEARS

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

GEARS SPUR GEAR WORM GEAR BEVEL GEAR

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

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

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

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

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

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

EXAMPLES 2.25” (2-1/4”) 25 teeth 4.50” (4-1/2”) 21/35, or 3/5
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

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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