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Quick answer: LEGO gear module is 1 (metric). See Section 3.4 at this link: http://bdml.stanford.edu/Main/CrawlerNotes The consensus seems to be the following: Lego gears have a metric module of 1, which is the same as a pitch of 25.4 teeth per inch of diameter. Pressure angle is likely to be about 20 degrees. (This is the most common angle with modern ...
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