传动部分是渐开线齿轮，工作部分可采用不同的工作面，如圆柱外圆面或圆弧形齿或渐开线齿轮齿顶修圆。
The transmission part is an involute gear, and the working part can adopt different working faces, such as a cylinder excircle face, a circular arc tooth or an involutes tooth gear top cavetto.
将土司放平，放人少许沙拉后，盖上另一片土司，并用碗扣出圆盒状，修掉四周硬皮即成。
Place the toast, spread some filling on top, cover with another toast, using a bowl to shape the toast as round, then cut off the rim of the toast.
渐开线终止圆与齿顶圆（或者修缘线的起点所在的圆）共同限制了所要求控制的渐开线齿廓的范围。
This circle along with the tooth tip circle (or start of chamfer circle) determines the limits of tooth profile requiring control.
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