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Presentation of the devices developed by students during the Arduino workshop.
Students of RS3 also had a discussion about their final projects with Marta Male-Alemany.
Xiomara Armijo, Saiqa Iqbal
_ In this assignment we dealt with a given section having a dimension of 500 mm X 500 mm X 350 mm to have a ribbed chair by using the Laser Cutter. the process of modifying the plain simple section into a waffled one is given below:
1._ first create a base file having separated layer for each of the major commands (base, contour, ribs, intersection, fabrication) along with their sublayers for x and y axes.
2._ select the outer surface of the given section. then apply the cage edit command (bounding box on). the number of control points can be manipulated by changing the x, y, z point count.
3._ move the control points to get the desired shape. keep the two outer layers of control points
in fixed position to maintain the given section in the 2 ends_ select the contour x layer. and command
Contour in x direction.
_ specify the distance between contouring according to the material distance and the grid resolution.
_ select the contour y layer and command Contour in y direction in the same process.
_offset the curve lines of the contours inside. the sections can be manipulated with the control points.
_ select the rib layer and use the command Planar Surface for the each contour curves with their offset curves to get the ribs.
_ maintain the two layers Rib x and Rib y for the ribs in x and y direction.
_ select another layer for intersect, command Intersect by selecting the ribs x and ribs y.
_ select another layer for drawing a pipe in on of the intersection line. the pipe diameter should be the thickness of the material.
_turn of all the offset options except the Mid and the Center.
_ move the end of pipe ( name it Pipe x) to middle of the intersection line. then make a copy of the pipe (Pipe y) to theother end of the pipe.
copy the two pipes together to the mid point of each intersection lines.
_ by selecting the ribs one by one runthe command Intersect between that rib with its corresponding pipes.
_ split the joints from the ribs by the command Split.
_ selecting the ribs one by one run the command Unroll Surface by selecting the
‘Rib X Unroll’ and ‘Rib Y Unroll’.
_ move the unrolled ribs away from the origin.
_ select the objects of Rib X Unroll and Rib Y Unroll layer and run the command
_ move the selected curves away from the rib surfaces.
_ name the pieces by numbers.
The starting point for creating a 3D foam model of our barrio, was by creating it in rhino. Using google earth as reference, the buildings were mapped and extruded, producing the file shown above. Next the polysurfaces were transformed into meshes in order to continue work with the rhinocam plug in. Bearing in mind the dimensions of the foam panels the model was going to carved out of, the mesh was made with a thickness of 3cm. Furthermore it was necessary to split the barrio model in three, indicated by the different colors in the figure above, in order for it to not exceed the width of the panels.
After the model was finished, the settings needed to be adjusted in the rinocam in preparation for use in the CNC milling machine. It is important to choose the adequate tools for both the task at hand as well as the material to be used. In this case, three different tools were selected. The first tool (with a diameter of 26 mm) was implemented to roughly work away the superfluous material from the top of the foam model, the horizontal roughing. Next, the second tool (with a diameter of 3 mm) was used to add the detail to the 3D model. And finally, a third tool (with a diameter of 6 mm) was used to cut the borders, the parallel finishing. Each tool was set to operate at a different speed, according to the function it had to perform.
The figure to the right shows the panel which allows you to select certain specifications for each tool. Of special importance, within these settings, is the stepover control which needs to be chosen according to the sides of the tool. It is key to chose this parameter so that a satisfactory balance is achieved between the detail of the work and the time needed to perform this work.
With the correct settings in place, a block with the dimensions of the foam slab to be used was drawn. The 3D model and its borderlines were then imported into this block. In doing so it is paramount to specify to the program to work within the borderline.
The screenshot to the left, shows the setting and the simulation of the first passages with the first tool.
The screenshot to the right, shows the setting and the simulation of the second passages with the second tool.
The screenshot to the left, shows the setting and the simulation of the third passages with the third tool.
Then, the final model needs to be checked to see if there are any mistakes or any areas which may enter into conflict with the production process. The red lines indicate a potential problem during production due to the foam slab coming into contact with the holder of the tool at those places, causing the foam block to move. Therefore these red areas need to be kept to a minimum.
Once the above steps have been completed, we have 3 files to import into the CNC milling machine. There is one file for each phase of the process, ie the horizontal roughing, the parallel finishing and the horizontal finishing. With all three files loaded, the foam panel is placed on the worktop and fixed into position. Next the x, y and z coordinates of the machine need to be set, taking into consideration the tool size and the foam size among others, and the milling may begin. After the completion of each fase, the tool needs to be changed and the z-coordinate set new. As stated above, the milling of our barrio required the whole process to be repeated on three foam panels.
The milled foam panels were then perfected by sawing off pieces and sanding the surface.
Finally, our barrio was mounted on a wooden basis, alongside the other barrios of Barcelona.