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<a title="Final parts"><img class="image center" src="images/week8/final.jpg"></a>
Below you can see a small animation of how the final assembly of our design will be with all his parts, in this case with 4 leves.<br>
<iframe width="560" height="315" src="https://www.youtube.com/embed/NOAvxp8hgAU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
<iframe width="560" height="315" src="https://www.youtube.com/embed/NOAvxp8hgAU" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe><br>
The material used is plywood is 18mm, after some tests carried out in group work, which will be seen later, this material does not need a tolerance in the inserts, as was done with the cardboard in the laser cutter.
<h2>Fabrication</h2>
In the lab, we use the CNC Multicam 3000, you can read more about the machine<a href="https://www.multicam.com/3000-series-cnc-router/">here.</a>
The first step is to place the 2.5m x 1.3m plywood plate by screwing it into the base and placing some nails to hold it.
<h3>The machine</h3>
In the lab, we use the CNC Multicam 3000. This machine is a CNC router that allows making 2D cuts in wood, plywood, MDF and other raw materials to perform, generally, carpentry work.
<a title="Multicam 3000"><img class="image center" src="images/week8/multicam.jpg"></a>(multicam)
The maximum working dimensions can be seen in the following picture.
<a title="Work Area"><img class="image center" src="images/week8/workarea.jpg"></a>
<h6>Source: https://www.multicam.com/3000-series-cnc-router/</h6>
An important characteristic of the Multicam is the vacuum that is produced in the work area, this is done to avoid that the material being cut does not move.
However, in some occasions it is necessary to screw the material into an additional wood and in this way make sure that the material will not move.<br>
You can read more about the machine here (https://www.multicam.com/3000-series-cnc-router/)<br>
<br><h3>Security protection: Personal Protection Equipment (PPE)</h3>
When working with wood, it is very important to work with the necessary safety elements to avoid accidents during work and in the long term.
Many of the particles that are suspended in the air can be carcinogenic, so it is necessary to wear lenses, gloves, respirators,earmuffs, work clothes, safety boots and to be in the safety zone while the machine is in operation, this area we have it delimited by a yellow line on the ground.
<a title="PPE"><img class="image center" src="images/week8/epps.jpg"></a>
<h6>Source: http://www.abodana.com/personal-protective-equipment-market/</h6>
<h3>Export files</h3>
The software that uses the Multicam (enroute cad cam) only recognizes files of the DWG type, for it we must export each face of all the pieces, to carry out this process in a faster way by means of the Inventor software (software that I used for the design ), we right click on the face of the cut and select export with the DWG format, as shown in the picture
<a title="Export"><img class="image center" src="images/week8/export.jpg"></a>
Once all the parts have been exported, we use the AUTOCAD software to place the pieces manually with the help of the technicians and the experience they have with the Multicam, the minimum space that must exist between the parts is 20mm. The result is as follows.
<a title="Final Export"><img class="image center" src="images/week8/big.jpg"></a>
The outer line of the image represents the dimensions of the material to be cut.
<br><h3>Preparing the machine</h3>
The material used is a 2.5m x 1.3m plywood plate.
<a title="Material"><img class="image center" src="images/week8/material.jpg"></a>
The first step is to place the plywood and screwing it into the base and placing some nails to hold it.
<a title="Polywood"><img class="image center" src="images/week8/polywood.jpg"></a>
Then the machine and the suction system are switched on and setup the zero position.
<a title="Start the machine"><img class="image center" src="images/week8/start.jpg"></a>
For my design, I do three types of work: internal displacement, external displacement and island filling. In all cases I use the 3/16” endmill.
<br><h3>Island filling</h3>
This work is responsible for making the 5mm wear that I make in my design, these parameters are used.
Then the machine and the suction system are switched on.
<a title="Start the machine"><img class="image center" src="images/week8/startmachine.jpg"></a>
To setup the zero position we use the control knob and a special tool following the following steps:
<a title="Zero setup process"><img class="image center" src="images/week8/zero.jpg"></a>
In the following picture the process of the configuration of the zero position is appreciated.
<a title="Zero setup machine"><img class="image center" src="images/week8/zeromachine.jpg"></a>
<h3>Manufacturing</h3>
The machine has several tools that are exchanged automatically using the M6 command of the G codes. In our case we will use the 3/16 " endmill.
<a title="Toolpad"><img class="image center" src="images/week8/toolpad.jpg"></a>
In order to be able to manufacture in an optimal way, we must carry out three types of work: internal displacement, external displacement and island filling.<br>
<br><h4>Island filling</h4>
This work makes the 5 mm wear that I do in my design. It is done as a first job because it will not make deep cuts and you cannot move the plywood, the parameters that are used are the following.
<a title="Island filling"><img class="image center" src="images/week8/island.jpg"></a>
<br><h3>Internal</h3>
These parameters are used to make the through cuts.
<br><h4>Internal</h4>
The next work that is done is the interior cut. Once worn some areas of the design, the internal cut is made ensuring that the plywood will not move. The parameters that are used to make the cuts are the following.
<a title="Internal cut"><img class="image center" src="images/week8/internal.jpg"></a>
<br><h3>External</h3>
To make the exterior cuts we use these parameters.
The last work is the external cut, we must ensure the small pieces, so they do not move during the cut, the parameters used are the following.
<a title="External cut"><img class="image center" src="images/week8/external.jpg"></a>
<h2>Assembly</h2>
Below is a video of how the design cut is made.<br>
<iframe width="560" height="315" src="https://www.youtube.com/embed/no3Ef92yRiE" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe><br>
<br><h2>Assembly</h2>
The result of the cut is shown in the following picture.
<a title="Final cut"><img class="image center" src="images/week8/finalcut.jpg"></a>
As you can see in the previous picture, it is necessary to sand all the pieces to start assembling it.<br>
Once having all the pieces sanded and prepared, it is time to assemble the object.
<a title="Asembly"><img class="image center" src="images/week8/assembly.jpg"></a>
<a title="Asembly"><img class="image center" src="images/week8/assambly.jpg"></a>
And this is the final design.
<a title="Heroshoot"><img class="image center" src="images/week8/heroshot.jpg"></a>
<br><h2>Group</h2>
As a group work, several types of tests are performed with the multicam, as a personal contribution I made the following designs
<a title="Test"><img class="image center" src="images/week8/test.jpg"></a>
The objective of these tests is to check the cut tolerances in plywood. After these tests we realize that it is not necessary to give a tolerance, since it will enter under pressure without major problems.
To see all the documentation of the group work, you can visit the <a href="http://fabacademy.org/2019/labs/cit/">CIT page.</a>
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