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This is an 8 tooth gear (really a pinion) with involute teeth, appropriate undercut and a keyway.

very cool. what software did you make this in?

impetus maximus wrote:very cool. what software did you make this in?

It's very easy to make it in blender.

Blender does well for the involute because it has a curve function that can approximate the tooth shape. I don't know how you'd get the right shape for the undercut though unless you just did a fillet. I used AutoCAD to get the gear shape (I used a step wise process) and then finished the model in 3DS Max. Missed some smoothing groups though. I'll have to fix it later.

Gear template generator online
https://woodgears.ca/gear_cutting/template.html

Of course bevel gears are far more fascinating (and take a bit longer to model) -

darkfrei, that's a nice online resource. They don't properly account for undercut though. Not important unless you have a very high gear ratio like 200 to 7. If you animate the gears, you can see the tip interference.

-put gif in spoiler

A long time ago I wrote a program in Excel, which can draw involute (russian name: evolvent). Just in case saved.
Gif is 2,5 MB! The file for downloading:

darkfrei - that is elegant