• jawa21@lemmy.sdf.org
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    11 hours ago

    I’ve been a machinist for over 20 years. Just no. You get specs from the customer, and yeah the tolerances are usually in mm. However, listing dimensions in thousands of mm makes no sense. The tolerances are always specified. If it wasn’t for NDA, I could show you a print from Siemens Medical that shows this.

    • gens@programming.dev
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      5 hours ago

      Sure. I’m not a professional machinist. I have worked on roofs and all sheet metal things are in mm. I have even worked for a company that makes those metal things and as a customer for another one. I also was by far the best at technical drawing in school, not to brag. And all the schematics for things I have seen are in mm, for example https://www.iclarified.com/images/news/48931/228250/228250-1280.png . Disclaimer, all the schematics that are not in, ugh, inches (or architecture).

      Sure, if I made something for someone they can give me dimensions in Smoots for all I care. But I would transform it into mm, and would never buy tools that don’t use mm.

      For context, I am not in an english speaking country nor Myanmar.

      Edit: Actually I have seen house schematics in mm as well. I thing they now give out in m, but use mm internally (depending on architecture firm).

      • jawa21@lemmy.sdf.org
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        5 hours ago

        I think you’ve missed my point here. Something that is 6,300 mm long should be listed as 6.3 meters. Doing otherwise completely eliminates the purpose of a pure decimal system. People don’t even use the system properly, completely omitting things like decimeters.

        • gens@programming.dev
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          5 hours ago

          When I asked the boss, who has been in the business for a couple generations, why it says here 4000 instead of 4m, he said what I am telling you. So you don’t mix up measurements.