This is my orthographic drawing of can opener. Actually, it is first experince for me such a complex tool and it was very difficult because details of object has to be calculate and afterall calculation has to be right for projection. And, we had a only one single can opener which was the most problematic issue. Firstly, orthographic projection has two main rules which are right perception ‘which means using paper as a right way in terms of top,rear and rear view’ and reference lines. I did place it as a top view on top-left side and reference lines shifted from this part. Line quality is another important issue and reference lines should be more lighter with using hard pencils.