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Simulator: Reading and Interpretation of Vernier Scale in Fractional Inch

Nônio Polegada Fracionária - Vernier Scale in fractional inch; Fracciones de pulgadas - 1/128"
Reading, practice and interpretation of vernier scale in fractional inch - simulator in 1/128"

Vernier Scale

The vernier scale is a technological device that increases the sensitivity of a scale to subdivide the lower division of it. In this simulator the vernier scale (rectangle below the scale) has eight spaces between the vertical lines. It divides by eight the 1/16in, which is the smallest division of the main scale (1/16in / 8 = 1/128in).

Scroll down the page to interact with the simulator or vernier scale. I suggest that before proceeding, you familiarize yourself with the concepts treated in Virtual vernier scale – simulator and practice of reading and interpretation in millimeter – tenth resolution (one tenth of millimeter – 0.1mm)

Vernier scale

In this simulator, the vernier scale is below, which slides under the main scale.

The main scale is graduated in fractional inch (this means that inch (1in) is divided in half ( 1/2in ), each division is further divided in half ( 1/4in ) and so forth ( 1/8in , 1/16i n , 1/32in …) as far as the vision acuity allow -figure 1.

inch divided into halves (fractions)

figure 1 – inch divided into halves (fractions)

The vernier scaler has eight divisions. He divides the smallest division of the main scale for eight (1/16in / 8 = 1/128in) -figure 2.

Vernier - to divide by eight smaller division of the main scale

figure 2 – Vernier – to divide by eight smaller division of the main scale

The mark of the vernier which align with a mark of main scale indicate the (sub)division of the measure -figure 3.

The action taken on the vernier must be added as the main scale (marks left of zero (0) of vernier) -figure 3.

fractional inch scale with the smallest division subdivided by a vernier scale

figure 3 – fractional inch scale with the smallest division subdivided by a vernier scale

Reading is very simple -figure 3 Note that the zero (0) of the vernier coincides with one of the marks of the main scale reading is direct.

If the zero of the vernier does not coincide with a mark of main scale (is between two), the main scale: some inches to the entire value of the fraction on the left of the zero mark of the vernier to the value of the vernier marks are aligned (phew). In the example of figure 3.

  • the measure we are taking is greater than 5 in and less than 6in
    • we take 5 in to start the sum
  • the zero of the vernier became the sixth mark of the main scale
    • 6 x 1/16 in = 6/16 in = 3/8 in
  • the fifth mark of vernier scale coincides with the main scale
    • 5 x 1/128 in = 5/128 in
  • some values (whole + fraction of the scale + fraction of the vernier scale)
    • 5 in + 3/8 in + 5/128 in = 5 in + 48/128 in + 5/128 in = 5.53/128 in

Scroll down and practice these skills in the simulator. Monitor resolution does not allow 100% effective in ‘align’

After interacting with the simulator, solve this:
list of reading and interpretation of vernier caliper in fractional inch exercises

Eduardo Stefanelli

Engenheiro por profissão, professor por vocação

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