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How to prepare a technical drawing for CNC machining
To request a quote for custom CNC parts on the Hubs platform, you only need to supply a 3D CAD file. Modern CNC machining systems can interpret the geometry of a part directly from CAD, which means that additional documentation, such as technical drawings, isn’t always required. To get more news about cnc machine drawing, you can visit runsom.com official website.
However, while technical drawings are not necessary to request a quote for CNC machining, they are still very important and widely used in manufacturing. Technical drawings improve the communication of technical requirements between designers, engineers and product developers and machinists. Providing a technical drawing can help you source better parts and even reduce your costs.
In this article, we’ll explain when to include a technical drawing (or machining blueprints) in your CNC order and what you need to include to get the most out of part sourcing. This article also includes technical drawing guidelines and best practices proven by Hubs’ engineers.
Even if your design doesn’t include these features, it’s generally good practice to include a technical drawing along with your 3D CAD file when placing a CNC order. Usually, the 3D CAD file is used for programming the CNC machine, and the drawing is used as a reference throughout the machining process.
Most CNC service providers can also manufacture parts directly from these CNC turning and milling drawings. In some cases, we find that they ever prefer them over CAD files. As you can see, technical drawings can be a significant part of sourcing custom parts, and there are many different standards and best practices for drafting them. If your drawing communicates all the technical requirements clearly, then it doesn’t matter which drafting techniques you use.
The title block contains basic information about the part you’re producing, such as the part name, the material, the finishing and color requirements, the designer's name and the company. It’s essential to fill in this basic information, as it informs the manufacturer about the part’s primary function.
The title block also contains other technical information, including the scale of the blueprint and the standards used for dimensioning and tolerancing.
Another element that’s usually present in or near the title block is the angle projection. The angle projection determines the way the views are arranged in the drawing. Typically, drawings that use ASME standards (US & Australia) use 3rd angle projection, and ISO/DIN standards (Europe) use 1st angle projection. The example blueprint at the beginning of this article uses ISO/DIN standards.
We advise that you add one or more 3D pictorial views of the part to your technical drawing. This makes the drawing easier to understand at a glance. Isometric views combine the illusion of depth with the undistorted presentation of your part’s geometry (vertical lines remain vertical and horizontal lines are drawn at 30 degrees).
Most information about the geometry of your part is conveyed in the main orthographic views.
These are two-dimensional depictions of the three-dimensional object, representing the exact shape of the part, as seen from the outer side of a bounding box one side at a time. Only the edges of the parts are drawn this way to communicate dimensions and features more clearly.
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