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Precision Design a Customized CNC Parts Drawing and Programing on CNC Machine

July 20, 2022

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CNC design is considered an important and indispensable step in the industrial cnc machining process. Knowing the design rules, processed products will achieve higher quality and save a lot of costs for businesses. Through this stage, the operator can also understand the work to be done and determine the necessary tools.


What is CNC Design?

CNC design is a process in which a designer creates drawings of parts to be machined. Attached are detailed parameters and requirements for processing quality to be achieved.

In CNC design, the custom CNC parts in China designer need to pay attention to and follow the basic rules to create a quality drawing, in accordance with the customer's requirements.


Limitations and Avoidances in CNC Design

In CNC design, you will have to design mechanical engineering drawings. This process may encounter errors that affect the machining process and product quality.

Therefore you need to understand the possible limitations of CNC design. In order to minimize errors and unwanted errors.

The limitations in CNC design are mainly due to the mechanics of the machining process, tool geometry, and tool accessibility.

2.1. Tool geometry in industrial cnc machining

The majority of CNC cutting tools is cylindrical and has a limited cutting length. As these tools remove material from the workpiece, they transfer the geometry to the part they are machining.

For example, the interior corners of a piece always have a radius. This is true even if you machine them with an extremely small cutting tool. This is the first limitation in CNC design. Design cannot interfere with the geometry of the tool impacting the material.

2.2. Accessibility of the tool in c custom CNC parts in China

Custom CNC parts in China have a limited reach, which creates certain limitations in the design. You must apply the cutting tools to the workpiece directly from above. You can't mechanically apply the features because you can't access them from the corner of the machine.


Therefore, follow certain design recommendations. The example aligns all part features in one of the six main directions. This can avoid problems related to tool access.


Factors to Consider When Designing CNC

3.1. Tolerance


In industrial cnc machining design, mechanical tolerances tell the manufacturer the dimensions of a part. They must match the dimensions specified in the technical drawings. Tighter tolerances mean that the dimensions should be almost exact.

In particular, not all part dimensions require minimum tolerances. For example, if a part is not part of a mechanical system. Now a tolerance of a few micrometers does not affect the function of the part.

Prototypes, too, can often be CNC machined to fairly loose tolerances, which can then be tightened for the final part if needed.

3.2. Number of cores

Many CNC machined parts incorporate cavities for mechanical or installation reasons, or to reduce mass. However, in CNC design, the size of the cutting tool determines the depth of these cores.

In general, a machined recess should be no deeper than four times the width of the recess. This helps to avoid tool misalignment and prevents workpieces from getting stuck in the cavity and causing problems.


3.3. Thickness in Custom CNC parts in China

Although CNC machines can make very small cuts on workpieces, machining thin walls can lead to instability. When machining plastics, very thin walls can easily be deformed. So it's best to keep the wall at a reasonable thickness.

Ultimately how thin these walls can depend on the machinery and materials used. Metals are more elastic and can be – to some extent – as thin as half a millimeter. On the other hand, walls that are machined with plastic must be at least twice that thickness.


3.4. Hole


In Custom CNC parts in China design, machined parts can incorporate round holes created using drills or end mills. There are limits to the depth of these holes.

In general, end mills produce holes with a better surface finish and offer more flexibility in hole size. However, they are limited in length.


3.5. Adding Text to industrial cnc machining

Adding text to a machined part is a surefire way to make them easier to recognize. Immersion text is faster and cheaper than enhanced text.


Each character must be spaced at least half a millimeter to avoid distortion. The font should always be sans serif.


3.6. Inner edges

When designing interior edges, the recommended longitudinal corner radius is one-third of the cavity depth or more. At this point, we should use a tool whose diameter follows the recommended cavity depth guidelines.

For a higher quality surface finish, it is best to have a slightly higher corner radius than the recommended amount. This allows the tool to cut along a circular path, instead of a 90-degree angle. However, if you want a 90-degree angle, you should use the T-bone cut instead of choosing to reduce the corner radius.


3.7. Undercuts

Undercuts come in two main types: T-groove and dovetail undercut.

T-slots are cross-sections and T-groove cutters therefore use cross-cutting blades that are fitted to a standard vertical spindle. This allows the standard 3-axis machine to cut across instead of down, allowing the machine to produce cross-sections.

Dovetail undercuts involve diagonal angles. To create this cut, use a dovetail tool with a conical surface. These tools are most commonly found with an angle of 45° or 60°.


Rules to Remember When Designing CNC

When designing a CNC, it is necessary to design parts so that the largest diameter tools can machine them.

Make sure the design features fit into one of the six main directions. If this is not feasible, you can apply five-axis industrial cnc machining.

Every time the part is clamped to the vise and positioned. This is called a setup. Reducing the number of setups reduces machine time, resulting in more cost savings.

Short-end mills with large diameters will give the fastest machining time, and the most cost savings.


The inner fillet should be as large as possible. This allows the use of a large diameter tool, reducing machining time. As a general rule, the radius should be less than a third of the height. So a 12mm deep recess should use an inner radius of at least 4mm. It is possible to have a smaller inner fillet, but the cost of the part will increase accordingly.


Why Tuofa CNC Machining in China?

Design, CNC machining a series of mechanical parts according to the requirements of customers in China and nationwide. Tuofa CNC machining receives orders for mass processing as required. We ensure technical requirements and progress.