Unlike most of Del's wooden machines, this pedal-powered scroll saw actually "does something"...it is a working tool. A wooden machine that can cut up wood...that sounds cannibalistic! But as Del points out, it is functional but not really practical. This machine has some parts made of other materials than wood: the flywheel is weighted with lead, the standard saw blade is steel & its holder aluminum, and metal screws & bolts were used to make it easier to take apart for adjustment or repair. To me, one of the most fascinating parts of the machine is the intricate pedal linkage. I know it took Del quite a bit of "fiddlin'" to make the pedals work smoothly. If you would like to communicate with Del directly, his YouTube channel is http://www.youtube.com/woodificood Also of interest: a feature article about Del in the magazine Scroll Saw Woodworking & Crafts (summer issue 2011). Short web version here: http://www.scrollsawer.com/features/mechanical-marvels-in-wood.html