Wrong. NASA and most of the Aerospace industry work in standard units. Zzzz I don’t understand why it’s so hard to understand. Most machine shops I’ve talked to have all of their equipment, bits and jigs setup with standard measurements in mind. Even if you ask for a part to be done in SI, they will ask you to either convert it, live with the tolerances or provide the tooling yourself. If you don’t know how to convert units, then you should not be an engineer…
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