Paint the tooth flank of the big bevel gear with a thin and equal red lead coat.

即在大锥齿轮的齿面上涂一层薄而均匀的红铅油，然后转动齿轮数圈。

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Usual plate gear have big diameter, but thin in depth, and have a axle hole in the center, so it can be simplified into a thin disc ring.

由于常用的盘形齿轮直径大，厚度小，且中间有较大的安装轴孔，所以可以将其简化为薄环盘，与变幅杆组成变幅器。

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