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Vernier caliper layout and usage
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There are scales on the ruler and the vernier scale. Take the vernier caliper with an accuracy of 0.1 mm as an example; the minimum graduation on the ruler is 1 mm; there are 10 small aliquots on the vernier scale; the total length is 9 mm; The index is 0.9 mm; the difference is 0.1 mm smaller than the minimum graduation on the main ruler. When the claws are close together, the ruler is aligned with the zero mark of the cursor; their first tick marks differ by 0.1 mm; The two tick marks differ by 0.2 mm; ...; the 10th tick marks differ by 1 mm; that is, the 10th tick mark of the cursor is just aligned with the 9 mm mark of the main ruler; as shown in Figure 2.3-2.
When the linearity of the object between the equivalent claws is 0.1 mm; the vernier should move 0.1 mm to the right. At this time, its first scale line is just aligned with the 1 mm scale line of the ruler. When the fifth tick mark is aligned with the 5 mm tick mark of the ruler; clarify that there is a width of 0.5 mm between the two claws; ...; and so on.
When measuring a length greater than 1 mm; the entire number of millimeters should be read from the "0" line of the cursor and the scale line opposite the ruler.
Use the vernier caliper to clean the claws with a soft cloth; make them close together; check whether the zero scale line of the cursor and the main ruler can be aligned. If it is aligned, it can be measured: if there is no alignment, remember zero error: zero scale of the cursor The line is called a positive zero error on the right side of the zero-scale line of the ruler; the negative zero error on the left side of the zero-scale line of the ruler (this rule is common to the rule of the number axis; the origin is positive to the right; the origin is negative to the left) ).
When measuring; hold the ruler with the right hand; move the cursor with the thumb; take the object with the outer diameter (or inner diameter) to be measured with the left hand; make the object to be tested between the measured claws; when it is closely attached to the claw; Reading; as shown in Figure 2.33.
The reading of the vernier caliper shall first read the millimeter integer on the ruler according to the zero mark of the cursor; that is, the integer in millimeters is somewhat. Then the first tick marks on the cursor are aligned with the tick marks of the ruler; as in the sixth The tick marks are aligned with the scale tick marks; the decimals are some 0.6 mm (if there is no line that happens to be aligned; the nearest line is taken for reading). If there is a zero error, then the above result is subtracted. Zero error (zero error is negative; equivalent to adding the same size of zero error); the reading results are:
L=Integer Some + Fractional Some-zero error discriminate which tick mark on the cursor is aligned with the scale tick mark; the following methods can be used: the adjacent three lines are selected; if the line on the left side is on the corresponding line of the ruler; The line on the right is to the left of the corresponding line of the ruler; the line at the center can be considered to be aligned; as shown in Figure 2.3-4.
If you need to measure several times to take the average; you don't need to subtract zero errors every time; just subtract zero errors from the final result.
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