DESIGNING-GEAR-IN-CATIA-V5.pdf

DESIGNING GEAR IN CATIA V5

Author’s Note:

This is step by step guide how to create gear using CATIA.

I'm not CATIA expert. Someone might find that CATIA doesn't

have much with TCP/IP and FreeBSD . I coulnd't find

much about gear design using GOOGLE or YAHOO. Since I enjoy

learing and practicing what I learn, I also enjoy sharing that

with others (often seen on overnet/edonkey: please share :)

don't be selfish. Here is step by step guide how to make spur gear

using CATIA. Note that this was inspired by document I have

found at website www.piovision.com (credits go to the unknown

designer).

But let's start. This document assumes that you have basic

CATIA experience. Also, this document assumes that you know basic spur

gear geometry. Here is excellent document from www.bostongear.com

in case you are not familiar. Some basic notations:

rb - base cylinder radius

r - pitch circle radius

rk - outside circle radius

rf - root radius

a - pressure angle (20deg)

m - modulo (in our example 20) m=p/3.14159 where p is circular pitch

2r=m*z

z - number of teeth (in our example 20)

When you start CATIA, go to TOOLS->OPTIONS->Infrastructure->

Part Infrastructure and in Display select Paramteres and Relations .

Then in Options->General in Parameters and Measures select With value

and With formula in Parameters Tree View .

Now it is time to go to Generative Shape Design :

You will see something like:

Bring Knowledge toolbar out:

Then by clicking on arrow pointed down near table icon:

Fog and f(x) are two most important things you will use for Gear

Design:

Now it is time to enter some basic parameters that define gear

This is done by clicking at f(x) icon:

And then when you see dialog box: Formulas: Part1

fist select Parameter type (real, length or angle) click new

Parameter of type and then edit value. You can do this until

all parameters are entered.

When you enter parameters it is time to enter some formulas.

For, r, rb, rk and rf we enter formulas by naming them and by

clicking Add Formula. Formula editor will appear: