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# ADDENDUM CIRCLE - PowerPoint PPT Presentation

ADDENDUM CIRCLE. B3. TIP DIA. ρ 3. PITCH CIRCLE. B2. PITCH CIRCLE DIA. ρ 2. B1. BASE CIRCLE. ρ 1. Bo or Ao. ROOT CIRCLE. A1. BASE DIA. R A0= R B0. R B1. R B2. R A1. R B3. R A2. α 1. Ø 1. R A3. Ø 2. α 2. α 3. Ø 3. O. GEAR PROFILE.

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B3

TIP DIA

ρ3

PITCH CIRCLE

B2

PITCH CIRCLE DIA

ρ2

B1

BASE CIRCLE

ρ1

BoorAo

ROOT CIRCLE

A1

BASE DIA

RA0=RB0

RB1

RB2

RA1

RB3

RA2

α1

Ø1

RA3

Ø2

α2

α3

Ø3

O

GEAR PROFILE

Here is given the profile generation by finding points from calculating angles α.

A2

A3

CALCULATION:-

ØI = Cos-1(RAI/RBI);

-Where RAI= Base Radius,

and RBI= Tip Radius.

αI=INV(ØI)=tan(ØI)- ØI.

(Angles are in radians.)