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The large CNC hydrostatic rotary tables mean the MRD tables produced by some machine tools manufacturers from Romania. These products are displaceable-rotary tables CNC controlled on two axes (linear and rotary), having modular construction for different dimensions (from 1700x2000 up to 4000x4000mm). All these are provided with hydrostatic circular bearing at the B axis (table rotation). The HBMC machine means Horizontal Boring Milling Centre, with different structure, normally with two bases in T. The MRD table must covers the X and B machine CNC axes. Now, the table construction is normally adapted at the positioning level, because the weight of the working part (between 15 and 100 tones at the entire modular machine family), is large enough. Positioning level means the using in static (clamped) position of the table on both axes. In the case of table using at HBMC machines, the table need to move quickly on all axes continuously, with high dynamic regime and high precision, even the weight of part is very large. At this application the constructive solution of the rotary part must be different of the classic solution at positioning level, which will be presented bellow.

CONSTRUCTIVE IMPROVEMENTS AT LARGE CNC HYDROSTATIC ROTARY TABLES AS ACTIVE CONTINUOS CONTROLLED AXES ON HBMC MACHINES