圆柱齿轮基节仪的调整应注意什么事项？
参考答案：（1）用调整量具校对好零位后，就可进行测量，测量时，活动量爪与被测齿轮的基圆或基圆附近的齿面接触，固定量爪与相邻齿的同名齿廓接触，两量爪接触的连线应在活动量爪与基圆接触点的法线上。
（2）为了提高测量精度，应沿齿圈大约相隔120度的位置至少测量三个齿，其最大的基节偏差（指示表的读数）为被测齿轮的基节偏差。
（3）从指示表读得基节偏差后，应再一次用调整量具校对零值，如零值误差大于0.005mm应重新测量。
（4）测量时，量爪与齿廓接触点的位置至少离开齿顶0.5mm，以免齿顶影响测量值。
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