Abstract: A machine tool base for high accuracy machining which has a vertical walled H-shaped frame of reinforced concrete, the side walls being spanned by a heavy steel plate supporting a massive horizontal granite block on one side of the cross-bar of the H to provide a vibration free machine support. On the other side of the cross-bar of the H is a control chamber area isolated by vibration insulation from the granite block. A coolant drain passage is formed around the granite block to drain off coolant used on metal removing machines supported on the block.