This is a post by Cat McClintock on PTC site.

When you talk to Michael Trenkle, mechanical engineer, about his automatic tool changer design, you might lose yourself in the details. 

 He’ll tell you about speed and accuracy down to the micron, and about how he ensures his subassembly interfaces with others in this 5000-part 3D model. He’ll describe the challenges of laying out piping and cabling for the oil, coolants, and the pneumatic air that runs through the system.

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