Another go to place for sketching, the Bloor Gladstone Library.
I came to a realization when I started sketching the photocopy machine: I start a details level and work my way out to bigger components. This could be said about how I start any drawing. For the most part it works for me, but the photocopy machine looks like disparate parts drawn side by side. I think I need to start on a large scale, and work down to the details. Broad strokes first.