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Zorluk: KolayPrecision Measurement Instruments

While servicing an engine cylinder head, a technician measures the outside diameter of an intake valve stem using a standard inch micrometer. The sleeve displays the major number 44 along with 11 exposed subdivision mark past it. The thimble aligns exactly at graduation 1818 with the sleeve datum line. What is the measured diameter of the valve stem?

  1. A
    0.418 in0.418\text{ in}
  2. 0.443 in0.443\text{ in}Cevap
  3. C
    0.468 in0.468\text{ in}
  4. D
    0.432 in0.432\text{ in}

Cevap

0.443 in0.443\text{ in}
On a standard inch micrometer, each major digit on the sleeve represents 0.100 in0.100\text{ in}, giving 0.400 in0.400\text{ in}. The single visible subdivision adds 0.025 in0.025\text{ in}, bringing the sleeve subtotal to 0.425 in0.425\text{ in}. Adding the aligned thimble reading of 0.018 in0.018\text{ in} yields the exact total measurement of 0.443 in0.443\text{ in}.

Adım Adım Çözüm

1
Read the main numbered graduations on the micrometer sleeve.
4×0.100 in=0.400 in4 \times 0.100\text{ in} = 0.400\text{ in}
Each numbered line along the sleeve represents one-tenth of an inch (0.100 in0.100\text{ in}).
2
Identify the number of visible subdivision marks past the major number on the sleeve.
1×0.025 in=0.025 in1 \times 0.025\text{ in} = 0.025\text{ in}
Each subdivision between major numbers represents one full revolution of the spindle, equal to twenty-five thousandths of an inch (0.025 in0.025\text{ in}).
3
Read the graduation on the thimble aligned with the sleeve index line.
18×0.001 in=0.018 in18 \times 0.001\text{ in} = 0.018\text{ in}
Each line on the thimble circumference represents one thousandth of an inch (0.001 in0.001\text{ in}).
4
Calculate the total measurement by adding all three scale components together.
0.400 in+0.025 in+0.018 in=0.443 in0.400\text{ in} + 0.025\text{ in} + 0.018\text{ in} = 0.443\text{ in}
The complete reading on a standard outside micrometer is the arithmetic sum of the sleeve reading and the thimble reading.

Anahtar Kavram

Standard Inch Outside Micrometer Scale Reading
Tahmini Süre:45s
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Konular

Precision Measurement Instruments

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