I'm working on paper cut mechanism, I use gears to move blade to cut paper. I would like to get knowledge about the technique of seling gear shafts to a metal frame. It would help me in designing elements in fusion 360, the limitations and sizes that I can use. I found information about gears and bending metal sheet fabrications enough but I failed to find any info about gear shift fixing to metal like it was done in my pictures provided below.
UPD: To due to my poor english my question was not clear enough I had to provide more detailed pictures and edit my initial post.
So I'm making case (frame made from metal sheets, bending fabrication) to hold gears, but some places are narrow and tiny, I'm not sure will be possible to seal pins in those places. If I get more info how the shafts are assembled into a metal cases I could design it in right way.