TO GET

HAVING

RULE

FORMULA

N

Number of teeth

Given

12

DP

Diametral pitch

Given

24

α

Pressure angle

Given

14.5

s

Arc space width

Given

0.06800

d

Pin diameter

Given

0.06701

PD

Pitch diameter

N/DP

0.50000

BD

Base diameter

PD•COS(α)

0.48407

A

s/PD

0.13600

D

d/BD

0.13843

INV α

Involute function of α

TAN(α)-[ α(π/180)]

0.00554

INVβ

Involute function of β

A+INV α-D

0.00312

β

Pressure angle to pin center

see tables page

(G14)

11.00809

CC

Twice the center distance of pin and gear

BD/COS(β)

0.49488

DE

Dimension under pins even # of teeth

CC-d

0.42787

DO

Dimension under pins odd # of teeth

CC•COS(90/N)-d

**************

*

Φ

Pressure angle to point of tangency

TAN(Φ)=TAN(β)+D

19.33857

RT

Radius to point of tangency

BD/[2•COS(Φ)]

0.25651