CART PROJECT

The main aim for this project was to get familiar with CREO parametric 4.0 software platform. The approach used for this project was a bottom-up design. Parts and sub-assemblies were first made and then they were assembled together to make a cart and then after the full assembly drawings of parts and sub-assemblies were made.

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Part modelling- Individual parts such as handle, cargo, frames, and bolts were developed by using commands like extrude, revolve, and sweep in CREO 4.0. Project and offset commands were used to imprint name on some parts. Family table was used to create tubing and hexagonal bolts of different lengths. And parts such as cargo and front wheel bracket were made using shell command. Mirror command was widely used to make same parts

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Springs were developed using helical sweep command and also side springs were made flexible by adding a relation between the two end-points of the spring. This feature will later be used during assembly of cart because we did not know the distance that would come between spring mounts so it became much easier to assemble them. Frame lower and frame upper were developed by projecting the curve. User Defined Feature (UDF) command was used to develop the side-wheel axle. The remaining parts were developed by some of the same techniques mentioned above.

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Sub-Assemblies- Sub-assemblies were made for efficient and quick final assembly. Side wheel assembly was made first as it had to be assembled twice so it became easier for them to assemble. Right side frame was assembled first then made to one single part and then was mirrored about central vertical plane to make frame left. Front wheel assembly assembled first and then was assembled to the full assembly. 

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Final assembly- Final assembly includes all the parts assembled together. Various constraints were used to make them fit properly together. Sub-assemblies were directly put together in the full assembly and A tubing member was made directly in the assembly. Axis constraints were made for some cylindrical members e.g. for bolts axis constraints were used to make them align together first and then surface constraints were used for them to fit together.