Suggestions on how to make your CAD designs more suitable for C

  • When designing models for CNC machining, it is critical to avoid creating walls that are too thin for the task at hand. Your models' quality will improve as a result of this. The fact that wall thickness is directly proportional to stiffness of a material means that reducing wall thickness would also result in a reduction in material stiffness, which would result in a reduction in achievable accuracy as a result of inevitable vibrations occurring during the machining process, as would be the case if wall thickness were to be reduced even more. Metal walls must be at least 0.794 millimeters thick, and plastic walls must be at least 1.5 millimeters thick, in order to meet the requirements of the regulations.

    The use of alternative manufacturing processes such as sheet metal fabrication, rather than CAD, is preferable and more cost-effective when designing thin walls. You may also want to check CNC Milling Process Can Be Either Horizontal or Vertical Direction.

    Use of design features that cannot be machined with a CNC machine should be avoided whenever possible.

    There are limitations to the amount of features that can be machined at the same time, and this is not always possible. Adding unnecessary features to designs, in the same way that adding unnecessary features to designs makes designs more difficult to machine, adding unnecessary features to designs makes designs harder to machine. When designing for CNC machining, it is often beneficial to have a thorough understanding of the machine's capabilities, as this allows you to create features that are capable of being manufactured by the machine.

    Because of the curvature of the hole, curved holes are a difficult-to-machine feature that cannot be produced with CNC mills, lathes, or drills due to the limitations of the machines used to create them. EDM (electrical discharge machining) may be the best option for you if you require this feature as well as other features that are impossible to machine in a conventional manner.

    It is imperative that extreme caution be exercised when working with tolerances.

    It is critical to remember that excessive tolerancing will only result in increased machining time and costs, and this should not be overlooked. If your dimensions do not have tolerancing, the machine will use the standard tolerance for such dimensions that it has set for such dimensions, which may be different from what you expect. If your dimensions do not have tolerancing, the machine will use the standard tolerance for such dimensions that it has set for such dimensions. Because of this, it is recommended that tight tolerances be specified only when absolutely necessary in order to save time and money. Also important is the preservation of homogeneous tolerancing, as this will reduce the amount of time required to machine the component.

    When creating your design, it is best to avoid including any extraneous aesthetic elements.
    It was previously stated in the section on ways to improve CAD designs that some features are only for aesthetic purposes and cannot be machined efficiently. Prior to removing parts solely for cosmetic reasons, it is critical to consider both the amount of material to be removed and the process that will be used. This is especially true when removing parts for no other reason than aesthetic reasons. what resources would be required, and how long would it take? Alternatively, depending on your preference, it could be a 5-axis or 3-axis machining process. It is possible to make a formal inquiry. Because aesthetics can be achieved through post-machining processes such as electro-polishing, you can improve the accuracy of your design by focusing on the accuracy of necessary features rather than the aesthetics of the finished product.

    When cavities are designed, the depth-to-width ratios should be exact and consistent throughout.
    When designing cavities, it is important to consider the depth to width ratio of the cavities. This will help you improve the overall quality of your designs. Having excessively deep cavities can result in the tool hanging, the tool deflecting, difficulty with chip evacuation, and in some cases, tool fracture.


    The depth of a cavity is defined as six times the tool diameter; however, the depth of a cavity should not exceed four times the width of the cavity, as this is deemed excessive. When considering a 15-mm cavity, the maximum depth in any direction should not be greater than 60 mm in any one direction.

    It is important to remember to include radii in your calculations when designing internal edges.
    Because of its shape, it is possible that designing internal edges for the machining tool will be a stressful experience for it. The following is a good rule of thumb to keep in mind:The following result can only be achieved by adding a radius that is 130% of the milling tool radius:As an illustration, if the radius of your milling tool is 5 mm, it is recommended that you increase the radius of all internal angles by 6.5 mm. Reduced stress is placed on the tool as a result of the increased radius, enabling faster cutting speeds to be achieved.

    In order to keep the length of the thread to a bare minimum,
    Common engineering knowledge holds that the strongest thread connections in threaded assemblies are found in the first few threads of a threaded assembly; this is true of threaded assemblies in general. Using thread lengths that are long enough for the application when designing tapped holes can help you improve the overall quality of your design and increase the longevity of your product. If the length of the thread exceeds three times the diameter of the hole, it is deemed superfluous and should be trimmed.

    When designing features, it is best not to make them too small.
    Because the majority of CNC machines have a minimum tool diameter of 2.5mm would be unable to machine any feature smaller than 2.5mm. The use of a special tool to produce features that were too small would increase the overall cost of the machine as well as increase the amount of time it would take to manufacture the part. As a result, excessively small features should be avoided whenever possible unless they are absolutely necessary.