CNC (computer numeric control) machining has revolutionised how manual and repetitive tasks are carried out in the manufacturing sector. Instead of having human personnel spending time repeating the same tasks throughout the day, machines can be programmed using unique software to carry out such tasks with a higher level of efficiency.
CNC machining is expanding beyond the manufacturing sector. Indeed, this concept can be used in 3D printing to facilitate various parts of the process. Since its introduction 20 years ago, 3D printing has been steadily growing in popularity and function. But how can CNC machining be used to improve 3D printing?
1. When preparing filament pellets
In 3D printing, the filament is the main material used to create new products. This filament is essentially a thermoplastic material that is formed from pellets. What happens is that the pellets are first melted, after which a continuous roll of plastic is extracted. CNC machining can be used to make filament preparation easier.
In particular, components of a 3D printer can be programmed to control how pellets are melted into the filament. This means that CNC machine programming can be used to control variables such as temperature, pressure and moisture during the filament preparation process. The end result is a higher quality filament.
2. During the extrusion of filament
A 3D printer filament is the blueprint and main raw material used to create 3D structures. Remember that a 3D filament is formed from the melting of filament pellets into a continuous roll of plastic. This roll needs to have a consistent thickness so it can serve as the blueprint of an object to be printed down the line.
A primary challenge that people experience during 3D printing is extracting the filament with a high level of consistency. Many 3D printing operators have to constantly monitor the filament diameter to ensure that it remains consistent during extrusion.
However, CNC programming techniques can be used to automate the filament extrusion process. With accurate programming, various machine components can monitor the filament diameter and automatically adjust the rate at which filament is being extruded from the machine. A slower extrusion rate results in a thicker diameter, and vice versa.
3. When preparing actual 3D prints
CNC machining also comes in handy during the actual printing process. While 3D printers handle the heavy work of doing the actual printing, CNC machines can be used to control variables such as temperature, pressure and rate. Various CNC components can be strategically installed in the 3D printer to automate relevant tasks and to collect data in real time. This data can then be interpreted to adjust various functions such as printing rate, filament use and the movement of specific parts.
Share20 February 2019
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