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CNC Machining Vs Injection Molding

Both CNC machining and injection molding seem perfect for product development. However, these two processes have a huge difference. CNC machining and injection molding have their advantages and disadvantages. If you are confused between the two, we can help you find the right solution. Here are the details about the CNC machining and injection molding.

What is CNC Machining?

CNC (Computer Numerical Control) machining follows coded programs for reducing the material layers from a block of your desired material. Since the whole process is controlled by a computer, you can expect a precise outcome and a good tolerance of the product.

What is Injection Molding?

As the name says, injection molding injects the molted parts into a mold. You will also get different materials for creating parts. The process includes melting the substance and injecting it into a mold at high pressure. When the parts get cold in the mold, it is ejected from it.

Which is a Better Process?

To decide which process is the best, you need to solely concentrate on your manufacturing requirement. Here are some parameters that help you choose the best process as per your needs.

Speed:

For lower volume manufacturing parts, you can go for CNC machining. However, when you need a large volume, injection molding is the best option. Injection molding takes time for creating the mold and ensuring the tolerance of the part. The next steps are easier to get done.

Cheap Process:

For a few parts, a CNC machine offers you a cheaper option. For example, you need a few hundred, and CNC machining is the ideal choice. Although the cost per part for the injection molding is cheaper than the CNC machining. But the huge upfront cost can subside the benefit, and you will get no profit for manufacturing a few hundred units. Whereas, Injection molding is a beneficial process when you have a large manufacturing volume.  The more volume you have, the higher the benefit you get when it comes to cost-saving.

Material:

With CNC machining, you will get different material choices. This is also an important factor to consider, especially when you require high-performance plastic. For injection molding, material selection is limited. High-performing materials are perfect for use in injection molding.

Tolerance/Surface Finish:

Here, CNC machining gets the advantage. This machining offers tighter tolerance and a smoother surface. Repeatability is another concerning factor that makes injection molding perfect. Molds can be perfect for producing millions of parts with the lowest wear.

Design:

If you want to modify the design frequently, molding can be expensive and makes the modification difficult. It is not the case for CNC machining.

So, here, you have learned the CNC machining and injection molding processes. Choose the right one depending on your needs. You can even consult with the RPWORLD as the company has been in the industry for many years, offering the right support to businesses.

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