System for tightening and positioning piece of wood before machining has upper platform inserted in lower platform, and plate mounted on bearing with ball bearing for allowing rotation of wooden part

摘要

System comprises lower platform (1) with two flanges inside which upper platform (4) is inserted in opposite direction. Half-mooned elongated drillings allows immobilization of upper platform in precise position. Role of platform (4) is to be used as support for tightening system that is fixed with screw (32) in rebate of bearing (18). Plate (16) is mounted on bearing using ball bearing (17) so as to allow rotation of part (12) when tightened.