As part of my curriculum at Cal Poly, I took a tooling and fixture design class. In this class, I designed a machining fixture to manufacture graduation keychains. 

For the fixture, I used MiteeBite clamps, locating rails, and a dowel pin to locate and clamp the keychain blank in place. To determine how to locate the part, I referenced the keychain's drawing to determine where all the datums on the keychain were. Using this information I was then able to choose appropriate locations for locating and clamping the keychain. In addition, I included other fixtures such a hole to use a spindle probe to set the coordinate system on the CNC mill, an indicating band to easily use a test indicator to square the fixture plate, slots for screws to attach the fixture to CNC mill, and nicely chamfered edges to prevent operators from accidentally cutting themselves. I also made sure the keychain blank could only be placed in one orientation correctly to prevent wrong orientations during setup.