# How to model a parameterised helical gear in proe?

Been stuck with a model for some time.I have got the parameters.Any help is deeply appreciated.

M_N=2.0 - module

Z = 24 - no. of teeth

alpha=17.5 - pressure angle

beta=28 - helx angle

cx=0.25 - bottom clearence coef.

hax=1.1 - addendum coef.

M_T=M_N/cos(beta)

A_T=ATAN(tan(alpha)/cos(beta))

d=z*M_T

db=d*cos(A_T)

da=d+2*hax*M_N

df=d-2*(hax+cx)*M_N

r=db/2

theta=t*60

x=r*cos(theta)+r*sin(theta)*theta*pi/180

y=r*sin(theta)-r*cos(theta)*theta*pi/180

z=0

Developed the curve but not able to porceed further.

### 2 Answers

Dude check this link and follow the equations

http://www.beyondmech.com/pro-e/cad-topic-30.html