在机构运动位置的有限接近状态下，得到拐点圆及鲍尔点。
The inflexion circle and Ball point were obtained under the finite approach state of mechanism movement position.
利用拐点圆概念和对称连杆曲线的特性，导出一个简单的方程序。
A simple equation is presented via the theory of inflection circle and the properties of symmetric linkage curve.
推广来讲，本法可成形磨无拐点的任意曲线的齿轮，如圆孤齿轮等。
Further this method can grind any curved lineal gears, provided they have no inflexion, for example, knuckle gears and so on.
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