Alvin Portable Drafting Machine Track-type drafting machine complete with drawing board that features a modern and compact, precision design. The Alvin Portable Drafting Machine is a functional drawing board with precision ball bearing, vertical sliding track drafting system and break lever on vertical sliding track offers three positions. 150 degree double hinged drawing head with two sets of plexiglass scales included, one set metric, the other is in full and half inch graduations. Complete system weighs 20 lbs. with a work surface area of 19 1/2"h x 22"w. Adjustable stand allows board angle at 0 degree, 20 degree, and 45 degree. Can be used along with CAD furniture set up. Carrying case protects parallel straightedge and provides convenient portability. Shipping weight 22 lbs.