A length measuring device. The most commonly used type is a clock-shaped one with hour and minute hands as indicators. The slight movement of the measuring spindle is magnified by a gear mechanism, which moves the indicator and can be read on a scale. The dial has 100 divisions around the circumference, with each division representing 0.01 mm. There are also some special dials where each division represents 0.001 mm. Due to their structure, there is a limit to the range of movement of the spindle, and therefore the length measurement range is often around 5 to 10 millimeters. Most 0.001 millimeter scale gauges have a resolution of 0.3 to 2 millimeters. Measurements are made by placing the contact point at the tip of the spindle against the object being measured. In addition to comparative measurements of length, they are widely used for measuring runout of workpieces, parallelism between two surfaces, and other measurements. Lever-type dial gauges, which use a lever to change the direction of movement of the contact point, are convenient for use in tight spaces. Some recent dial gauges are capable of digital display, and progress is being made in automating dimensional management. [Hidetaro Nakayama and Shinji Shimizu] ©Shogakukan "> Dial gauge structure Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
長さの測定器。普通使用されているのは、指針として長針と短針とを備えている時計形のものである。測定スピンドルのわずかな動きを歯車機構で拡大し、指針を動かし目盛りで読み取るようになっている。 ダイヤルの目盛りは、円周を100等分してあって、一目盛りが0.01ミリメートルを示す。特殊なものとして、一目盛りが0.001ミリメートルを示すものもある。 構造上、スピンドルの動く範囲には限度があり、したがって長さの測定範囲は、5~10ミリメートル程度のものが多い。0.001ミリメートル目盛りのものでは、0.3ミリメートル~2ミリメートルとなっているものが多い。スピンドル先端の測定子を被測定物に当てて測定をする。長さの比較測定のほか、工作物の振れ、二面間の平行度、その他に広く使用されている。てこによって測定子の動く方向を切り換えられるようにしたてこ式ダイヤルゲージは、狭い場所で使用するのに便利である。最近のダイヤルゲージには、デジタル表示が可能なものもあり、寸法管理の自動化も進められている。 [中山秀太郎・清水伸二] ©Shogakukan"> ダイヤルゲージの構造 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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