Did you ever have the need/desire to cut some gear shapes out of basic materials like wood or phenolic using basic tools like a band saw?
If so, you owe it to yourself to check out the Web-based Gear Template Generator created by Matthias Wandel. Using simple fill-in boxes to set the parameters, you can generate paper templates to cut many types of standard gear arrangements, as well as planetary gears, and rack and pinion setups.
If you are really into such things it is also worth checking out Wandel's "Woodworking for Engineers" website.
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