Archive for May, 2019

Task:

The excercise consisted in using the CNC machine to transform a 10x10x2 cm wood tile. To achieve the goal it is necessary to create a 3d model, then a G code to define how the machine will interact with the material and finally set the parameters on the CNC machine software to run the file and cut the piece.

Softwares:

  • Modelling: Rhino
  • G code generation: Art Cam
  • CNC interface: NcStudio

Tools and machines:

  • CNC
  • Manual basic tools for wood

Process:

In order to understand the possibilities of the CNC and the kind of results it could generate, I decided to make one prototype 90° angles and complex geometric intersections and another with more simple curved geometries using only boolean unions and substractions in Rhino.

For the first prototype, I subdivided a 10×10 cm rectangle in different proportional modules and created a topography by extracting them in different heights.

To make the work of the CNC more complex and understand the possibilities of it, I intersected an elliptical section volume and subtracted it from the original topography

After the volume is created, I transformed it into a mesh and uploaded into the Art Cam software whose procedure I will explain later in this blog.

In a first step it is necessary to define the size of the model and it’s position in the digital interface
In a second step we must set the size of the milling bit and the path it will follow and we exporte the G code
The CNC machine es composed by a surface where the material is placed and mechanical arm who follows numerical instructions.
The material that will be milled must be fixed to the surface. For this essay we used double side tape. The use of protective glasses is highly recommended.
We set the starting point in the software
We upload the G code into the NcStudio software from the CNC machine and we run the file.

The result was not as I expected maybe because of the reasons I will describe:

-Possibly the size of the geometries was too small for the milling bit.
-Sharp orthogonal shapes are not easily cut.
-The cutting path strategy was not proper for curved and orthogonal cuttings.

In a second attempt, I made a curved geometry thru a similar substractive process of design in Rhino.

I uploaded it to Art Cam

We must first define the scale of the object
Then introduce the final geometry in the volume that will be cut.
Define the milling strategy and the parameters according to the material and the kind of work that will be done.
In this case we fixed the tile to a piece of wood using screws.
And we programmed the CNC to go longer and in more phases to have a smoother result.

Files:

https://drive.google.com/file/d/1DHkLkrM-eU6LYXFM-FU6dyMuQvenyuCN/view?usp=sharing


https://drive.google.com/file/d/1aLFilJi7YI_s9jFpWasGxdcQ74MZcFSs/view?usp=sharing

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