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What is the difference between 3D printing and CNC?

When quoting a prototype project, it is necessary to select the appropriate processing method according to the characteristics of the components to complete the prototype project faster and better.
At present, the hand plate processing mainly includes CNC machining, 3D printing, lamination, rapid mold and so on. Today let's talk about
The difference between CNC machining and 3D printing.
First of all, 3D printing is an additive technology, and CNC machining is a subtractive technology, so they are very different in terms of materials.
1. Differences in materials
3D printing materials mainly include liquid resin (SLA), nylon powder (SLS), metal powder (SLM), gypsum powder (full color printing)
, sandstone powder (full color printing), filament (DFM), sheet (LOM), etc. Liquid resin, nylon powder and metal powder
Occupy the vast majority of the market for industrial 3D printing.
The materials used in CNC machining are all pieces of plates, that is, plate-shaped materials. By measuring the length, width, height and consumption of the parts
damage, and then cut the corresponding size of the plate for processing. There are more choices of CNC machining materials than 3D printing, general hardware and plastics
All types of plates can be CNC machined, and the density of the molded parts is better than that of 3D printing.
2. Differences in parts due to molding principles
As we mentioned earlier, 3D printing is a kind of additive manufacturing. Its principle is to cut the model into N layers/N multi-points, and then follow the sequence
Build up layer by layer / little by little, like building blocks. Therefore, 3D printing can effectively process and produce parts with complex structures.
For example, hollow parts, while CNC is difficult to realize the processing of hollow parts.
CNC machining is subtractive manufacturing. Through various tools running at high speed, the required parts are cut out according to the programmed tool path. Therefore CNC
Machining can only process rounded corners with a certain radian, but cannot directly process inner right angles. It must be processed by wire cutting/sparking and other processes.
to realise. Outside right angle CNC machining is no problem. Therefore, parts with inner right angles can be considered for 3D printing.
There is also the surface. If the surface area of ​​the part is relatively large, it is recommended to choose 3D printing. CNC machining of the surface is time-consuming, and
If the programming and operator experience is not enough, it is easy to leave obvious lines on the parts.
3. Differences in operating software
Most of the 3D printing slicing software is easy to operate, even a layman can skillfully operate slicing in a day or two with professional guidance
software. Because the slicing software is currently optimized very simply, supports can be automatically generated, which is why 3D printing
Can be popularized to individual users.
CNC programming software is much more complicated and requires professionals to operate it. People with zero basic knowledge generally need to learn about half a year.
In addition, a CNC operator is required to operate the CNC machine.
Because the programming is very complicated, a part can have many CNC machining solutions, while 3D printing can only be done because of the correct placement.
Processing time consumables have a small impact, which is relatively objective.
4. Differences in post-processing
There are not many post-processing options for 3D printed parts, generally grinding, oil injection, deburring, dyeing, etc.
The post-processing options for CNC machined parts are varied, in addition to grinding, oil injection, deburring, and electroplating,
Silk screen printing, pad printing, metal oxidation, laser engraving, sandblasting, etc.
There is a sequence of hearings, and there are specialties in the art industry. CNC machining and 3D printing each have their own advantages and disadvantages. Choose the right processing technology for
Your prototype project plays a vital role. Choose Qi Le, our engineers will analyze and recommend your project.