Assignment: Make something big To begin with this assignment, I didn´t have idea about what to do, many
things crossed by my mind. After thinking a long time, I decided to do
a piece of furniture and make some sketches of how it will be.
After
that, I used the software Rhinoceros and begin to design the different
parts of the desk, follow there are some pics of these.
After
I finished the design in Rhinoceros, I exported it in a DXF file to
make an assembly test, then I cut the parts in acrylic to
test if they fit correctly
As a result, it was noticed that the parts did not fit properly and were slightly larger
Therefore
I perform a correction on the dimensions of the assemblies before
cutting it into the correct size. I reduce 1mm in each side. Now, I begin to use the ShopBot. But, first I learn how to work with it.
After finishing the cuts with the shopbot, we made the cuts with the laser cutter the circles in the middle of the table.
testing the correct fit of the parts
Using the software PartWork
Finally we make the furniture assembly process. The material used for the cabinet is plywood of 15mm and acrylic of 3mm and the mill bit used was 1/4 inch.
In the following images i show the process consider what the cutting
speed used is 9000 RPMs and the characteristics of the mill.
In this work I used acrylic not for the structure, I used it for the accessories to customize the table.
In this case got pretty good assembly result.
Finally,
a study of mechanical effort was made, I used Inventor, which loads the
file from Rhinoceros and gives it material properties Wood (Walnut)
because I could not find plywood. However, I put efforts with points
of application as shown in pictures with a force of 450N, which is
about half the weight of a man in vertical and horizontal directions of
application.
The pricipal results are shown using color charts.
The
results show that horizontal stresses generate greater effort in the
points of engagement of the side supports, while the vertical forces
affect the whole structure and half the weight of a man is in the half
of scale so, if a man of average weight stands on it, the result is
that the structure the table would collapse.
