Some dial scales come with 200 division graduation. If the sliding jaw moves for 0.1″, at the same time, the needle travels for 100 divisions (0.1″ of the main scale equals one full rotation), then the value of the dial scale’s smallest division is: And many dial scales have 100 division graduation. The dial scale functions to magnify the main scale’s smallest division. This is generated from the graduation of the main scale that has 10 divisions per 1″.ġ″ : 10 divisions = 0.1″ Dial Scale’s Smallest Division Value Main Scale’s Smallest Division ValueĬommonly, the smallest division of the main scale has a value of 0.1″. So, in case the dial caliper that you are using has no information about it, you always know what to do. However, for learning purposes, you need to know where it comes from. Generally, the dial caliper manufacturer will let you know the smallest reading of each scale by marking it. This zero error value can be negative or positive.īefore you do the calculation, you have to know the smallest division’s value of both the main and the dial scale - we will multiply those two values with the counted divisions of the scales later on. It shows a certain reading, while it should give a reading of 0″ or 0 mm (no zero error). Zero error is an unwanted reading when you close the jaws. Zero error = the divisions passed by the needle from “0” for both closed jaws × dial scale’s smallest division value.Dial scale reading = the divisions passed by the needle from “0” × dial scale’s smallest division value.Main scale reading = the divisions passed by the jaw from “0” × main scale’s smallest division value.Main Scale Reading + Dial Scale Reading − Zero Error = Final Reading You have to calculate all the component readings to get the core final reading. General Formulaīasically, reading the dial caliper is like reading the vernier caliper. Especially reading the fractional dial caliper, it is quite different. Additionally, you will learn how to read dial caliper whether in inches, mm, or fractions. You will be learning to count the main and dial scale, take the zero error into account and calculate the final reading. This post has a purpose to guide you on how to read dial caliper. The dial scale graduation is clearer and easier to read. However, it’s considered easier than reading the vernier caliper. The main issue of this difficulty may lay in the dial scale reading. Some dial calipers even provide both inches and mm graduation.įor some people, reading the dial caliper may not be as intuitive as reading the digital caliper. The metric-based dial caliper (graduated in mm) can come with a resolution down to 0.02 mm. As the name suggests, it comes with an inch graduation system and can provide down to a resolution of 0.001″. The commonly used dial caliper on the U.S. There is an imperial or metric dial caliper. Simply, if you ask how to read dial caliper, you have to master these two scales. The main scale is linear like the ruler, while the dial/secondary scale is circular. Learning about how to read a dial caliper is about learning how to read its main and dial scale.
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