CAD
CAD is a very essential and integral part of mechanical engineering. There are numerous challenges eliminated by using CAD packages. I use Solidworks but if you have any other packages that you prefer and can post some jpeg files on the website then that would be incredible.
P.S if you do not have solidworks e-drawings download it at
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Pencil Sharpener Assembly Drawing

Sharpener Assembly Drawing
Parts Assembly- Learn how to dimension and write tolerances
- Vice Jaw- Learn dimensioning
Assembly Drawing- Learn how to draw assembly drawings

Vice Assembly- Learn how to Make Assembly Drawings and Bill of materials
Download the solidworks e-drawings of all the above drawings