Workshop Tools: The Micrometer Caliper

Precise Measurement Down To 0.01mm

こんにちは職人の新藤です。
今日は普段工具を使わない方には、かなり理解に苦しむ話になるかも知れませんが是非あきらめずに最後まで読んでください。

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.
指輪が一周、すべて同じ幅になっているかを測る道具には「マイクロメーター」を使います。

マイクロメーターは、リングの幅などを測る計器です。

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.

アトリエでよく使っているのは「デジタルノギス」です。

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.
指輪の厚さを測るにはノギスが必要です。
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.

力の入れ具合で発生する誤差もとても少ないです。
その代わりに、計測する箇所は力がかかるので破損しやすいパールや宝石の計測には向いていません。

測る面が大きいので、計測面が曲がっているものも測れません。

アトリエでの使い道をまとめるとこのようにわかれています。

ノギスで測るもの:宝石・パール・指輪の厚さ

マイクロメーターで測るもの:指輪の幅、板(金属の材料)の厚み

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.
ねじのように回転させることで計測する箇所が開いたり閉じたりします。

写真で測っているリングは仕上がりで2.7mm幅にする指輪ですのでヤスリがけが終わった時点で2.80mmにしました。
一周どこを測っても誤差0.03mm以下に手作業で加工します。

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.
そこの上側の、縦に刻まれている目盛り、これが1mm間隔です。
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.
右の回転する部分の目盛りは30をさしています、1周すると測る箇所が下側の目盛り1メモリ分の0.5mm移動します。

いま測っている場合だと、上側の目盛りが2本目(2mm)
2mmの線の右下の0.5の目盛りが見えているので2.5mm以上はある事が解ります。
そして回転する部分の目盛りがピッタリ30(0.30mm)をさしているので
合計で 2mm+0.5mm+0.30mm で 2.80mm になります。

1/100mmを正確に測るにはこの道具が欠かせません。

デジタルのマイクロメーターもありますが、アナログな機械って形も良いですよね!

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

See more handmade jewelry crafted with precision by MITUBACI artisans here.です。

Workshop Tools: The Micrometer Caliper
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