Notes from a Mechanical Designer - Page 2 of 42 - A site for disseminating know-how and information learned in mechanical design

: 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 ...

: Coefficient of Linear Thermal Expansion (Coefficient of Linear Thermal Expansion)｜Basic Knowledge and Calculation Methods for Machine Design

2026/1/20 Heat treatment, Thermal measures, Physical characteristics

Here, I would like to make a note on "List of coefficients of linear thermal expansion, basic knowledge and calculation methods for machine design," which are characteristics to pay attention to in machine and jig materials. In the past, I have also experienced the dimensional change of parts due to temperature change.

: Tolerance and Surface Roughness Design of Bearing Mounting Area｜Complete Explanation of Key Points

2025/10/13 Bearing, Tolerance design

This is a note on "fit tolerance design and surface roughness design of bearing mountings," which is the most important aspect of bearing usage. Many websites explain the basics of fit tolerance ...

: Types of Bearings and Correct Usage｜Knowledge Designers Need to Know

2025/11/9 Oiles/ No Oil bush, Bearing, Design method

Here is a memo titled "Types of Bearings and Their Correct Usage｜Knowledge Every Designer Should Know. When I started my career as a mechanical designer, the selection of bearings was (and still is) a headache for me many times...

: 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.

: List of Forklift Jaw Dimensions (1.5 ton to 4 ton)｜Standards by Load Rating

2025/11/13 forklift

ここでは　機械設備　の設置や移動でに使われる　「フォークリフトの爪寸法」　をメモしています。私自身、機械設計者としてキャリアを始めた頃、重量物を搬入するためのフォークリフ ...

: A Complete Guide to Motor Selection and Types [For Mechanical Designers].

2025/10/19 Motor, Design method

This section provides notes on the types of motors that many people may have trouble selecting when designing a machine. In machine design, motor selection is an important factor that determines the performance of ...

: How to Write Geometric Tolerances｜Explanation of geometric tolerances from basics to applications

2025/11/13 Tolerance design

Here are some notes on "geometric tolerances," which are mentioned in the Mechanical Drawing and Tolerance Design articles. I have received many complaints about drawings with geometric tolerances, such as "the intent of the drawing is not conveyed correctly to the manufacturing department," "suppliers are not aware of the geometric tolerances," and "the drawing is not accurate.

: Comprehensive List of Specific Gravities of Materials｜Basic Knowledge of Machine Design

2025/11/16 Physical characteristics

ここでは　機械構造に使われる材料　の「比重」をメモしています。機械設計において、部品の重量やコストを正確に把握することは、製品の性能を決定づける上で極めて大切です。　その ...

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