双层角尺齿轮(图16),在纺织机上用得很多,重量轻,牙齿翻出后不再加工。但是因为数量需要得多,铸造往往是大批的,因此,模子必须准确、坚固、耐久。最好用金属做,如铝、铁、铜等,先把模子精密加工,拆动的地方,略做出斜度(图17)。 Double-sided corner gear (Figure 16), used on textile machines a lot, light weight, no longer pulls out the tooth processing. But because the quantity is much more needed, casting is often done in bulk, so the mold must be accurate, sturdy and durable. It is best to use metal, such as aluminum, iron, copper, etc., first mold precision machining, demolition of the place, made a slight slope (Figure 17).