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1·The paper makes mathematical analysis on the causation of error in profile machining, and resolves the problem using altering the method in numerical calculation.

本文对这种加工误差产生的原因进行了数学分析，通过更改数值计算的方法解决这个问题。

2·The experiment error which altering barycenter of sand pendulum brings about is analyzed theoretically. And it is also an important factor comparing with others.

从实验误差理论角度，分析了沙摆重心变化引起的实验误差，结果表明由重心变化引起的误差相对于其它误差而言在实验中占主要地位。