Guides for drilling machine is made of cylinders of decreasing diameters fitted one into another, the smaller cylinder mounted on a ball bearing forced onto the mandrel of the drilling machine

摘要

Guide is made of cylinders (2,3) of decreasing diameters fitted one into another. The smaller cylinder (2) is mounted on a ball bearing (1) forced onto the mandrel (7) of the drilling machine. A ruler (6) is printed on the side of the cylinders to block the cylinders in a given position.