Standards, title block, and scale ratio
How the material is chosen — and why it matters
Introduction
A technical drawing must be recognizable, archived and traceable. Therefore fixed conventions are followed for paper formats, drawing headers and revision control. These conventions are described in international and Danish standards for technical documentation so drawings can be exchanged across companies and countries.
The drawing title block
The drawing title block is the drawing's business card and is usually placed at the bottom right. It should make it possible to identify the drawing unambiguously, even if it is copied or separated from the rest of the set.
- 01The drawing's title and drawing number
- 02Project name and client/customer
- 03Measuring technique: calipers micrometer and 20 degrees
- 04Drawn by, checked by, and date
- 05Revision field with revision letter/number and description
Measurement temperature (measure at 20 °C): ______
Scale indicates the ratio between the drawing's dimensions and reality's dimensions. A scale of 1:1 means the drawing is full size; 1:50 means a length in the drawing corresponds to 50 times as much in reality, and 2:1 means the drawing is enlarged. Choose a scale that makes details readable without making the drawing unnecessarily large.
Revision control
Drawings change through a project. Revision control ensures that everyone works according to the newest version and that changes can be documented. Each time a drawing is changed after it has been sent out, the revision is incremented, the change is described in the revision box, and the new version is distributed — while old versions are marked as obsolete.
Format and exchange
Paper formats follow the A series (A0, A1, A2, A3, A4), where each format is half the size of the previous one. For digital exchange, PDF is typically used for reading and approval, while editable CAD files and open exchange formats are used when others need to work further in the model.
Traceability throughout the process
The connection between drawing number revision and project folder means you can always trace back why a decision was made. That discipline is often the difference between a project that can be handed over smoothly and one that ends in confusion.