Engino  Mechanical Science: Cams & Cranks Construction Kit ENGINO: Play to Invent Multidimensional construction system. Build structures and machines. Introduces young engineers and physicists to how cams and cranks are used to convert reciprocal motion into linear motion. Excellent addition to a home-school curriculum. Brought to you by Elenco. ENGINO: Play to Invent Multidimensional construction system. Build structures and machines. Introduces young engineers and physicists to how cams and cranks are used to convert reciprical motion into linear motion. Excellent addition to a home-school curriculum. Brought to you by Elenco.