Concept, Interaction & Product Design. WIKISPEED - WIKISPEED. BlackFoot 4x8 v4.1 CNC Machine. BlackFoot 4'x8' CNC Router Kit v4.1 The blackFoot 4'x8' CNC machine has a cutting area of 4 feet (48 inches/1219.2 mm) by 8 feet (96 inches/2438.4 mm).
The machines is intended to cut 4'x8' sheet material. WikiHouse. Open Source Ecology. Compressed earth block. Building a CEB project in Midland, Texas in August 2006 Compressed Earth Block often referred to simply as CEB, is a type of manufactured construction material formed in a mechanical press that forms a compressed block out of an appropriate mix of fairly dry inorganic soil, non-expansive clay, aggregate, and sometimes a small amount of cement.
Typically, around 3000 psi is applied in compression, and the original soil volume is reduced by about half. Open Source Ecology.