Pegard Boring Mill Precivit 3.S.BC

Modernization from sliding guideway to hydrostatics We converted a Pegard table type boring mill with a 60 kW spindle drive power to a machine with hydrostatic guideways and backlash-free drives. There are significant disadvantages in relation to sliding guideways, namely when it comes to different states of friction and wear behavior. Especially when milling outlines – with multiple CNC axes simultaneously – you can observe the stick-slip-effect when the feed rate is very slow or when changing quadrants, which leads to the outlines being inaccurate. In the case of hydrostatic guideways, the contact surfaces of machine parts sliding across each other are inevitable separated by an oil film. This minimizes friction, which in turn the stick-slip-effect. Due to the free of play drive components and the guideways that hardly wear out, the machine operates at a higher level of accuracy over the course of its entire service life. We use controlled hydrostatics to make sure the new components are perfectly fitted to the existing machine parts. Every hydrostatic pocket is controlled separately. Other advantages include the much higher rigidity in comparison to conventional hydrostatics. The amount of oil that is needed is also lower. In combination with a modern Heidenhain CNC control system, this technology add new quality to the machine.