Flattening stock is an essential step in the milling process. These days, most of us use electric-powered jointers, but for centuries, cabinetmakers and carpenters relied on roughing, or scrub, planes.
The final, precise steps to complete a woodworking project are often preceded by tasks that require aggressive cleaning, shaping, and sanding.
I started scroll sawing in 1971 with a Delta machine that had a primitive spring mechanism on the top of the blade. Thankfully, things have come a long way.