Workshop Tools: The Micrometer Caliper

Precise Measurement Down To 0.01mm


What is a Micrometer Caliper?

In the making of our rings, it is crucial to ensure standardization in the widths. This is where the micrometer caliper comes in handy; it measures all parts of the ring width.

The Micrometer Caliper

The Difference between Micrometer Caliper and Vernier Caliper

Most of us would have come across a vernier caliper in our lives, especially during our times in school. The ones we use at our atelier is the digital vernier caliper.

Digital Vernier Caliper

Both scales of the digital vernier caliper read up to 0.01mm. The scales' tips are thin and pointed so that this tool can measure various things, such as gemstones and pearls. However, one downside of the vernier caliper is that there may be a discrepancy of 0.01~0.02mm in the measurement depending on the force applied when using the tool.

On the other hand, the micrometer caliper can measure flat surfaces with high accuracy. Unlike the vernier caliper, the micrometer caliper is less likely to produce discrepancies due to the amount of force applied when measuring. However, its downside is that it is unsuitable for measuring fragile items such as pearls and certain gemstones. Also, it cannot measure curved or bent surfaces.

Here is a summary of the function of these tools at our atelier:
Vernier caliper is used to measure gemstones, pearls, and thicknesses of our rings.

Micrometer caliper is used to measure widths of our rings and thickness of metal plates.


How To Use a Micrometer Caliper?

Measurements are taken by turning the metal ratchet on the right of the micrometer caliper. As the ratchet is turned, the spindle (measurement points) open and closes. No matter which point the ring width is measured, we ensure that the difference in measurements amounts to no more than 0.03mm.


Do you know how to read the measurement on a micrometer caliper?

A closer look at the scales of the micrometer caliper.

The vertical scales above the horizontal measuring scale (in the middle of the image) measures 1mm, while those below it measures 0.5mm. When the barrel on the right (displaying 25, 30, 35 etc.) is turned, the barrel moves either left or right along the horizontal measuring scale. The size of an object is measured by where the barrel intersects with the horizontal measuring scale. The image above shows a measurement of 2.5mm on the horizontal measuring scale and the barrel reading 0.30mm. The vertical scales above the horizontal measuring scale (in the middle of the image) measures 1mm, while those below it measures 0.5mm. When the barrel on the right (displaying 25, 30, 35 etc.) is turned, the barrel moves either left or right along the horizontal measuring scale.

The size of an object is measured by where the barrel intersects with the horizontal measuring scale. The image above shows a measurement of 2.5mm on the horizontal measuring scale and the barrel reading 0.30mm. Totalling the figures (2.0mm+0.5mm+0.3mm), the image presents a measurement of 2.8mm. In conclusion, the micrometer caliper is one of the best tools when it comes to precision measurement. Even though digital versions are available, the analog device has its unique charm.




Thank you for reading this journal, albeit filled with more technical aspects, until the end!

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Workshop Tools: The Micrometer Caliper

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