RE: [CAD_CAM_EDM_DRO] Re-Invent the wheel?

Go buy Autodesk Inventor 10 and download iParts from http://www.sdotson.com/
and various other sites.

Most manufacturers (gears included) have CAD drawings available in various
formats, just ask them or look on there web site.

Here's a site, one of many mostly European vendors;
http://www.web2cad.co.uk/

Stuffs' not hard to find.

Below is a simple Excel spread sheet that has some parameters for a simple
Spur Gear iPart for Inventor. Plug in whatever values you need and viola! A
gear to your specifications. Like I said this one is simple, they get
considerably more complex from here.

Inch Gear Wizard
Variable Name Value
Pitch 16.000000
Pressure Angle 14.500000
Number of Teeth 16.000000
Face Width 0.500000
Bore 0.375000

Do Not Edit Below This Line !!!
Variable Name Value
PD 1.000000 in
ADD 0.062500 in
DED 0.072313 in
CL 0.009813 in
OD 1.125000 in
RD 0.855375 in
BC 0.968148 in
CP 0.196350 in
CT 0.098125 in
NT 16.000000 ul
A 14.500000 deg
FACE 0.500000 in
BORE 0.375000 in