Hi The Extractor:
You need that gear profile if you want to CNC mill that part.
And it has to be the correct profile.
The DP needs to be correct.
The pressure angle needs to be correct.
The involute profile needs to be correct.
An STL file will not do it...you need a CAD file format your CAM system can follow to generate your toolpath.
A DXF file will probably work just fine.
So somebody needs to make that file if you cannot get it from the customer.
Is it going to be you?
Do you have the CAD tools you need to do that?
If you do not, your Prototrak is not going to help you very much.
So you need to do it the old fashioned way:
If you think the 3D printed gear has a good enough tooth profile on it somewhere around its periphery, make yourself a fly cutter by hand grinding it from an HSS blank and fitting it to the 3D printed gear with a Dremel a backlight and a magnifier so you can see what you're doing.
Bolt the 3D printed gear onto your brass blank and mount the whole works on a dividing head or a rotary table standing up.
Whisker out the tooth spaces on the brass gear until you just touch the printed gear with your cutter.
Mark the 3D printed gear with a Sharpie so you can see when you just touch it with the flycutter.
Doing it this way allows you to circumvent the whole CADCAM thing...you don't need to care what DP or PA or involute profile is, but you will have a correspondingly crappy gear (by gear standards).
But if it works, who cares!
Cheers
Marcus
www.implant-mechanix.com
www.vancouverwireedm.com