Homemade belt grinders mounted on a common pedestal. But for the contact wheels, all materials were surplus components. The grinder features an all-aluminum frame, while the KMG clone is a variable-speed unit controlled by a VFD.
Make your own knife - Blade shapes. This links to a board where you can join in and meet fellow knife making enthusiasts; or you can just use these pictures of knives as an idea to build your knife from.