threading
ねじ切り
解説 Definition
threading は thread（ねじ山を切る、糸を通す）の現在分詞・動名詞です。ここでは部品にねじ山を作る「ねじ切り」を表し、機械加工や製造の文脈で使われます。
The act or process of cutting a helical screw thread into a rod, pipe, or other component. It can also describe someone currently performing this type of machining operation.
覚え方のコツ Memory Tip
原形 thread に -ing を付けた現在分詞・動名詞で、語末の発音は /ɪŋ/ です。thread は「糸」だけでなく、らせん状に連なる「ねじ山」も表します。機械加工では thread a rod／pipe が「棒・管にねじ山を切る」、threading はその加工中の動作や工程だと覚えましょう。
Threading is the -ing form of thread, with the ending pronounced /ɪŋ/. A thread can be a thin strand, but it can also mean the raised spiral ridge of a screw. Connect these ideas through their shared image of a thin line running continuously along or around something. In manufacturing, threading a rod or pipe means cutting that spiral pattern into its surface. Expressions such as threading a metal rod and pipe threading identify either the action in progress or the machining process itself.
例文
The technician is threading the metal rod.
技術者が金属の棒にねじ切りをしています。
Threading the pipe requires a steady hand.
そのパイプのねじ切りには安定した手さばきが必要です。
They inspected the part after threading was finished.
ねじ切りが終わった後、彼らはその部品を検査しました。
threading の類義語・関連語
threading の語源・成り立ち Etymology
threading は thread「糸・ねじ山」に -ing が付いた形で、thread は古英語 þrǣd「より糸」にさかのぼる。糸のように細く連なるものを通したり刻んだりする発想から、機械では「ねじ山を切る」という意味へ広がった。関連語は threadbare、thready。
Threading consists of thread and the suffix -ing. Thread comes from Old English þrǣd, meaning a twisted strand or thread. Its sense expanded from a slender continuous strand to similarly shaped lines and ridges, including the helical ridge on a screw. In machining, the verb thread consequently came to mean forming such a ridge, while threading names the action or process.
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