Spur Gear Creation

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Spur Gear CreationUsing………

This information is necessary to complete this assignment.

N = Number of Teeth DPxPDOD = Outside Diameter (N+2)/DPPD = Pitch Diameter N/DPDP = Diametral Pitch N/PDRD = Root Diameter OD-2(HW)CD= Center Distance CD=PDgear1/2+PDgear2/2 A = Addendum 1/DPD = Dedendum HW-AWD = Whole Depth 2.157/DPR=Tooth Radius ¾(CP)CT = Cordial Thickness PDsin(90/N)CP= Circular Pitch 3.1416/DP

Outside Diameter (OD)

The overall diameter of the gear. OD=(N+2)/DP

Pitch Diameter (PD)

The diameter of an imaginary pitch circle on which a gear tooth is designed. Pitch circles oftwo gears are tangent.PD=N/DP

Diametral Pitch (DP)

A ratio equal to the number of teeth on a gear per inch of diameter.DP=N/DP

Root Diameter (RD)

The diameter of a circle coinciding with the bottom of the tooth spaces.RD=OD-2(wh)

Center Distance (CD)

The distance between the axis of two mating gears.CD=PDgear1/2+PDgear2/2

Addendum (a)

The radial distance from the pitch circle to the top of the tooth.a=1/DP

Dedendum (d)

The radial distance from the pitch circle to the bottom of the tooth.d=wh-a

Whole Depth (wd)

The full height of the tooth.wd=2.157/DP

Tooth Radius (r)

Radius of tooth profile.r=3/4CP

Chordal Thickness (ct)

The straight line thickness of a gear tooth measured on the pitch circle.ct=PDsin(90/N)

Circular Pitch (cp)

The distance from a point on one tooth to the corresponding point on the adjacent tooth, measured on the pitch circle.cp=3.1416/DP

ASSIGNMENT

Create a pair of gears using the following data:

12 Tooth

2.4 Pitch Diameter

12 Tooth

2.4 Pitch DiameterN = Number of Teeth 12

PD = Pitch Diameter 2.4

DP = Diametral Pitch N/PD =12/2.4 =5

A = Addendum 1/DP =1/5 =.2

D = Dedendum WD‐A =.4314‐.2 =.2314

OD = Outside Diameter (N+2)/DP =(12+2)/5 =2.8

RD = Root Diameter OD‐(2WD) =2.8‐(2(.4314)) =1.94

WD = Whole Depth 2.157/DP =2.157/5 =.4314

CT = Cordial Thickness PDsin(90/N) =6sin(90/30) =.313

CP=Circular Pitch 3.14.16/DP =3.1416/5 =.6283

R=Tooth Radius ¾(CP) =3/4(.6283) =.471

N = Number of Teeth 12


DP = Diametral Pitch N/PD =12/2.4 =5


D = Dedendum WD‐A =.4314‐.2 =.2314



WD = Whole Depth 2.157/DP =2.157/5 =.4314



R=Tooth Radius ¾(CP) =3/4(.6283) =.471

30 Tooth

6.00 Pitch Diameter

30 Tooth

6.00 Pitch DiameterN = Number of Teeth 30


DP = Diametral Pitch N/PD =30/6 =5


D = Dedendum WD‐A =.4314‐.2 =.2314



WD = Whole Depth 2.157/DP =2.157/5 =.4314



R=Tooth Radius ¾(CP) =3/4(.6283) =.471

N = Number of Teeth 30


DP = Diametral Pitch N/PD =30/6 =5


D = Dedendum WD‐A =.4314‐.2 =.2314



WD = Whole Depth 2.157/DP =2.157/5 =.4314



R=Tooth Radius ¾(CP) =3/4(.6283) =.471

Spur Gear Creation

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