Know-how learned in machine design - Information dissemination site

Machine Designer's Note

General Standards/Recognition

: Comparative Guide to Thread Standards: Metric, Unified, and Whitworth Differences

2025/9/8 Screw/Bolt, General Standards/Recognition

Here is a note on the difference between Metric, Unified, and Whitworth thread standards. In mechanical design, we incorporate foreign-made parts into our designs and perform maintenance on imported machinery ...

: Steel nomenclature by manufacturing method and steel nomenclature by application

2025/8/31 General Standards/Recognition

Here are some notes on how to call steel products by manufacturing method and by application.　(This is for searching this blog.) steel products 2000 steel products pressure

: Textbook of Factory Power Supplies｜Explanation of Types, Voltages, and Overseas Standards for Machine Design

2025/8/27 General Standards/Recognition

This is a note on the "factory power supply" for motors and other equipment used in factory automation (FA) facilities. When I started my career as a mechanical designer, I was asked by a factory to provide the specifications of the power supply for the factory.

: All you need to know about undercut machining｜What it means and what machine designers need to know

2025/7/22 General Standards/Recognition, Machining/ Foundation

ここでは、機械構成部材における「アンダーカットとは何か」「アンダーカットとはどんな加工か」などについて機械設計者が知るべき意味と注意点をメモしています。機械設計の現場で「 ...

: Involute Spline JISSD2001 with 20° pressure angle was abolished and integrated into JISB1603.

2022/4/13 General Standards/Recognition

Today's note is that "Involute Spline JISSD2001 with 20° pressure angle has been discontinued and integrated into JISB1603". If you are looking for an involute spline with a pressure angle of 20°, you will not find it.

: List of pipe taper threading amount, depth, and threading dimensions

2025/10/13 General Standards/Recognition, Piping screw

Today's memo is about "Screw-in Amount, Depth, and Dimensions of Pipe Threads." This article is for those who want to know the screw-in amount, depth, and dimensions of pipe threads; those who want to see the thread shape and dimensions of pipe threads...

: Things to note about the type generated by the CAD data download service and the notation in the catalog

2020/5/12 General Standards/Recognition

Today's note is about "things to watch out for in the type and catalog notations generated by CAD data download services". I would like to write about a mistake I made the other day in a row.

: What are UL Standards, a brief summary of UL Standards

2025/2/28 General Standards/Recognition

Today's note is a brief summary of what UL Standards are. The image is borrowed from UL's website UL Standard UL Standard is a standard of UL, a certification organization in the United States.

: Links for those who want to buy or search for JIS standard books now.

2023/11/30 General Standards/Recognition

Today's memo is "Links for those who want to buy or search JIS standard books right now. JIS standard books for those who do not know the JIS standard number but want to search for JIS standards that exist.

: What are the QT and AT level tests performed on space equipment?

2024/2/24 General Standards/Recognition

Today, I would like to make a note about "QT and AT level examinations" which are often heard in the space industry. What are QT and AT levels? QT = Qualification Test English: Qualification Test Meaning: Qualification Test (in general, QT level ...

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