In general, shoe samples only need to design a standard template with an intermediate number (or any number in the series). As for the whole series of prototypes used in mass production, it is based on the standard model of the middle number (or any number) and is obtained by expanding or shrinking according to an irregular relationship of equal differences. According to China's shoe size and shoe size series, the principle of zooming: if the shoe size is larger or smaller, the length of the base must be increased or decreased by 5 mm on the basis of the medium length. The circumference must be in the middle. Based on the increase or decrease of 3.5 mm. The specific scaling ratio can be expressed as the difference between each 1 mm of expansion and contraction: the unit length (per 1 mm), the equal error = 5/medium, the base length, the unit width (width) (per 1 mm), etc. Difference/Middle size. The difference in length and width (surrounding) between the lengths of any part of the shoe sample can be calculated using the following formula: Length of shoe-like arbitrary part = Length of each part of the shoe × 5 / Length of the sample at the bottom Length of any part of the shoe-like sample (Wai) degree difference shoes wide (circumference) degree × 5 / circumference
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