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| why is the US not Metric |
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| Tepe:
--- Quote from: tooki on February 13, 2020, 12:57:02 am --- --- Quote from: Tepe on February 12, 2020, 09:27:51 pm --- --- Quote from: forrestc on February 12, 2020, 05:13:49 pm ---The one major area where pretty much every country in the world has not metricated is aircraft flight levels. --- End quote --- Note the altimeter in this Saab J35 Draken ("Höjd m"): --- End quote --- Please go back and read the whole thread, this issue was discussed at length a few weeks ago. Civil aviation and commercial aviation don’t use the same standards always. --- End quote --- The Draken was neither civil nor commercial ;-) --- Quote from: tooki on February 13, 2020, 12:57:02 am ---To all the folks only joining the thread now: please read the whole thing. You are just coming in and restating what we thread veterans have all discussed long ago. --- End quote --- I was here from the beginning. It's nothing but entertainment that won't change anything. Utterly harmless. |
| Tepe:
--- Quote from: tooki on February 13, 2020, 12:53:44 am --- --- Quote from: Tepe on February 12, 2020, 09:21:40 pm --- --- Quote from: tooki on February 12, 2020, 04:49:30 pm ---Not to mention that many common metric sizes for things are actually just the metric approximation of US fractional sizes. For example, in many industries one finds diameters of 3.2, 2.4, 1.6, and 1.2mm, which are the metric approximations of 1/8”, 3/32”, 1/16”, and 3/64”, respectively. --- End quote --- But nonetheless expressed in mm. The origin doesn't really matter. --- End quote --- Doesn't it, though? If the whole point is to standardize on metric production, then using things that aren’t metric (even if they’re expressed in metric) violates the metric-ness of the matter. --- End quote --- No, it really doesn't matter. The fact that the non-integral numbers 3.2, 2.4, 1.6, and 1.2 owe their origin to fractional inches means nothing. A 3.2 mm drill is just that, a 3.2 mm drill. Bigger than a 3.0 mm one and smaller than a 3.5 mm one. It doesn't bother people in metricated countries where expressing the diameter in fractions of an inch would be absurd. 3.2 mm specifies the size in the system people are used to and that is enough. It's the same drill we are talking about, we just call it something more meaningful to us. Now, why we need those diameters in the first place is another matter of course - and it obviously has a lot to do with significance of products and standards originating in the US, where, as you have shown, those sizes make perfect sense. |
| Gromitt:
--- Quote from: SkyMaster on February 13, 2020, 02:28:10 am --- --- Quote from: Tepe on February 12, 2020, 09:27:51 pm --- --- Quote from: forrestc on February 12, 2020, 05:13:49 pm ---The one major area where pretty much every country in the world has not metricated is aircraft flight levels. --- End quote --- Note the altimeter in this Saab J35 Draken ("Höjd m"): --- End quote --- Except for some communist countries, nobody in the world is using meter as an altitude unit in aviation. :) --- End quote --- You mean countries with the same level of communism as Canada? :P |
| KL27x:
--- Quote ---It's the same drill we are talking about, we just call it something more meaningful to us. --- End quote --- To be honest, imperial drill bit sizes are not all that meaningful even to me. Anything beyond 8ths, I tend to just measure the screw/pin/dowel with calipers, then find the drill bit with calipers, lol. There's also the time-tested trick of holding the screw and drill bit together, to see that the threads of the screw are just visible behind the silhouette of the drill bit. :) Interesting some of the world calls 1/8" 3.2mm. I have seen, here, the metric size stated as 3.15mm, or maybe I just remember it wrong. The actual dimensions are 3.175mm. |
| tooki:
--- Quote from: Gromitt on February 13, 2020, 12:56:38 pm --- --- Quote from: SkyMaster on February 13, 2020, 02:28:10 am --- --- Quote from: Tepe on February 12, 2020, 09:27:51 pm --- --- Quote from: forrestc on February 12, 2020, 05:13:49 pm ---The one major area where pretty much every country in the world has not metricated is aircraft flight levels. --- End quote --- Note the altimeter in this Saab J35 Draken ("Höjd m"): --- End quote --- Except for some communist countries, nobody in the world is using meter as an altitude unit in aviation. :) --- End quote --- You mean countries with the same level of communism as Canada? :P --- End quote --- Canada is not among the 9 countries in the world that use metric flight levels, either exclusively or partly. https://en.wikipedia.org/wiki/Flight_level#Metric_flight_levels |
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