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本文以刻度值为2′的量角器为例,谈谈Ⅰ型游标角度尺示值误差的检修问题。如图1所示,主尺1的外圆半径导向面和尺座3的半径导向面是确保该尺正常工作的基准面。由于经常局部使用,主尺外圆面将产生不均匀磨损,引起尺座3的回转中心与主尺1不同心,造成角值超差。另外,角度尺表面产生锈蚀、毛刺等,或直尺8与直角尺2因使用中磨损,其直线度和角度不符合要求,影响量角器的零位及示值,同样会造成角值超差。
In this paper, the scale value of 2 ’protractor, for example, to talk about the type Ⅰ vernier angle ruler error repair problems. As shown in Fig. 1, the outer radius guide surface of the main scale 1 and the radius guide plane of the scale base 3 are the reference planes for ensuring the normal operation of the scale. Due to the frequent local use, the outer surface of the main ruler will produce uneven wear, causing the ruler seat 3 and the main ruler 1 center of rotation is not the same, resulting in angle value tolerance. In addition, the angle scale surface rust, burrs, etc., or ruler 8 and square ruler 2 due to wear and tear, the straightness and angle does not meet the requirements, affect the protractor zero and indication, the same value will cause angle error.