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Model train portfolio
Designer: Jake Carson
Project: Model Train
Project: Model Train
I CAN:
1. Sketch and model an auxiliary view of a given object.
2. Describe the purpose and demonstrate the application of section lines and cutting plane lines in a section view drawing.
3. Sketch a full and half section view of a given object to communicate its interior features.
4. Apply assembly constraints to individual CAD models to create mechanical systems.
5. Explain how assembly constraints are used to systematically remove the degrees of freedom for a set of components in a given assembly.
Throughout this portfolio, I will show evidence to prove the above statements by modeling a toy train.
1. Sketch and model an auxiliary view of a given object.
2. Describe the purpose and demonstrate the application of section lines and cutting plane lines in a section view drawing.
3. Sketch a full and half section view of a given object to communicate its interior features.
4. Apply assembly constraints to individual CAD models to create mechanical systems.
5. Explain how assembly constraints are used to systematically remove the degrees of freedom for a set of components in a given assembly.
Throughout this portfolio, I will show evidence to prove the above statements by modeling a toy train.
On the left is a rendered picture of the assembled model train. All parts are in their correct places, with nothing overlapping. I used insert constraints to assemble all the different pieces onto my train body. The more constraints you apply to a set of parts, the less they can move around. These constraints remove their degrees of freedom one by one. Sometimes, as it was a few times in this case, I was able to remove all degrees of freedom of a single part with just one constraint. To the right is the drawing sheet of the assembly. Everything I have done with this assembly proves the "I Can" statements 4 and 5.
To the left is a picture of my exploded view of the assembly. I used the tweak components function to move the parts from their places. On the right is a drawing sheet of my exploded view, with all the parts labeled with numbered balloons. I also have my list of parts in the lower left-hand corner of the drawing sheet.
To the right is the rendered image of my train body. This piece is the very base piece for the train. It is drilled with various holes, some threaded, some not. These holes are what allows the other pieces to attatch to the train body. Every edge, excluding the rims of the holes, has been rounded. This is also shown on my drawing sheet to the right, which provides multiple auxillary views of the train. These views are what my dimensions will label. This part that I have modeled proves the "I Can" statement #1.
Above is the rendered picture of the smokestack of the train. This smokestack has a counterbore hole in it, as illustrated by the drawing sheet. The bottom part of the stack is made to fit into the hole in the top part of the front of the train; this is shown in the assembly. I used a series of 3 different sketches and a loft to create the body of the stack, and then a counterbore hole in the top to hollow out the stack.
Above is the hitch magnet for the train. This was probably the simplest part I made for the train. All I had to do to make this part was to create two circles with the same center point, and then extrude the space between the circles.
Above is the hitch peg for the train. Once again, like the hitch magnet, this was a very easy part to create. I sketched out one half of the peg and then revolved it around an axis to create the model. I also chose to do an optional chamfer at the bottom; this chamfer would make it easier in real life to insert the peg into its hole in the train.
Above is a wheel for the train. I enjoyed making this part, as many different functions were neccessary to create this model. I sketched a half of the wheel, and then revolved it around a center axis to create the base body. Next, I sketched out the "spokes" for the wheel, and then cut out the material between them. Then, I created a sketch on the edge for the linkage attatchment, extruded that to its correct distance, and hollowed out a hole in the center for the linkage peg. To the right is my dimensioned drawing of the wheel.
This is the axle peg for the train. To make this part, I sketched a half of the part and then revolved it to create the profile. Next, I created a hexagon in the top and extruded that into the body to make the part where the user would screw the bolt into its place. I threaded the peg itself to allow it to screw into the threaded hole (s) in the side of the train.
Above is the linkage arm for the train. This arm connects the wheels together so they move as a whole. Because of this linkage arm, only one wheel has to be powered for both wheels to move. To the right is my dimensioned drawing sheet of the linkage arm.
Above is the linkage peg for the train. This peg is what holds the linkage arm to the wheel. The left picture is my rendered image of the peg, and the right picture is the drawing sheet for it. As you can see, I did a section view of this peg, which allows the reader to understand the dimensions better. This section view of the part proves the "I CAN" statements 2 and 3.
Above is the cow catcher for the train. The three small extrusions on the back of the part are what fit into the small holes on the front of the train to hold the part on the train. This piece is shelled out to the correct thickness to make it lighter. There are small shelled out portions in the front of this part as well.
This is the straight track for the train. I started with a solid rectangle and sketched out the various parts on the front face. Then, I extruded those parts into the profile to create the finished straight track.
conclusion
I enjoyed this assignment very much. It has definitely been one of my favorites so far, as it presented a hard challenge, but still attainable. I learned how to use a few new features in Inventor, one of those being the "render" tool, which is used to create a real-looking picture of a part. I am not just learning new features, though. I have learned new skills in explaining a part to help others create it as well.
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