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CNC Milling: Its Advantages and Disadvantages Clearly Explained

CNC Milling: Its Advantages and Disadvantages Clearly Explained

2022-06-28 15:33:26

CNC milling is a machining process that uses computerized controls and cutting tools to selectively remove material from a workpiece and produce a custom-designed part. A CNC milling machine features a table that automatically moves (or rotates) the workpiece on different planes so the cutting tool can work on it.

 

Unlike manual lathes, a CNC milling machine operates by converting a 3D CAD model into a set of computer instructions, which is then used to dictate the tooling’s actions and movements automatically.

 

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What are the Advantages of CNC Milling?

 

#1 Precision

 

One of the biggest advantages of using CNC milling machines is that they can create parts exactly to specification. Because CNC mills rely on computer instructions to fabricate parts, they eliminate the possibility of human error common in manually operated machines. This means you can accurately create complex parts while achieving tolerances as tight as 0.004mm.

 

#2 Fast and Efficient

 

Conventional milling machines often require an operator to manually change cutting tools depending on the cutting operation to be performed. Not only is this time-consuming, but it is also inefficient as end results are based on the operator’s judgment.

 

CNC mills feature rotating carousels that can hold up to 30 different tools. These tools are automatically exchanged on the spindle during machining operations, allowing cutting operations to be performed quickly and efficiently. With CNC mills, you can have your parts ready in a matter of hours, whereas conventional methods may take days (or weeks) to complete.

 

#3 Wide Range of Material Options

 

CNC mills boast compatibility with a wide range of materials, including plastics, metals, and composites. So long as you’ve got blocks of the material, CNC mills will have no problem machining it.

 

#4 Affordability

 

We can talk about precision, speed, and a ton of other advantages all day, but nothing beats affordability, especially for businesses looking to rely on third-party manufacturers. CNC milling is among the most affordable modern-day manufacturing processes. In fact, a CNC milled component would cost you less than a comparable 3D printed part.

 

What are the Disadvantages of CNC Milling?

 

#1 Material Wastage is More in CNC Milling

 

CNC milling is a subtractive manufacturing method-it starts with a block of material and cuts away portions of it to form the finished part. As a result, there is more material wastage in CNC milling than in additive manufacturing processes, such as 3D printing.

 

#2 There are not Enough Qualified Technicians

 

Although pretty much the whole milling process is automated, CNC milling still requires highly trained engineers or technicians to program mills, calculate requirements and supervise the mills so that high-quality parts are always produced.

 

Not so many machine shops can boast of highly qualified CNC mill operators; as a result, there have been many horror stories about low-quality machined parts.

 

Conclusion

 

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