HMS 2300 O Automatic Line Boring Machine is designed for the purpose of accurately, machining engine main bearings and eccentric camshaft bearings. The machine is made of vibration resistant steel. The gearbox and spindle bearings made of high quality castings are mounted on fine ground slide ways and vertical columns respectively. The bearings/housing are fine ground and the spindle chromium plated. Gear box and spindle bearings are manually driven up and down. The gearbox moves 45 cm right and left automatically while the boring spindle traverses 55 cm. When the machine is in operation the gearbox is automatically lubricated whereas the work spindle is lubricated dropwise. In order to obtain fine surface finishes, the rotating speeds can, steplessly and digitally be adjusted at any required value. Rotating speed values can be seen on a digital screen.