New linear systems of measure with support of measure of steel
For a precision and high dynamics in machines tool with direct motors, the linear systems of measure used have to have of a resolution and a repetibilidad high, to end to guarantee a control of the exact speed, even to slow speeds. For this require linear systems of measure that generate a signal of position of high quality with deviations of minimum interpolation. For these cases are especially indicated the systems of measure of the range LF of Heidenhain with principle of photoelectric catchment interferencial. With them they generate , from the period of the graduation of 8 µm, signals of catchment with a period of signal of 4 µm. These signals of catchment are to a large extent free of harmónicos, being able to be interpoladas by high factors. The deviations of position inside a period of signal are, in the revised models LF 185 and LF 485, typically inferior to +/- 0,04 µm. This corresponds to <1% of the period of signal.
The support of measure of the armoured rules, manufactured according to the process Supradur, is realised on steel. Thanks to this, the systems of measure present a clear-cut thermal sensors behaviour that, with his coefficient of thermal sensors dilatation αtherm 10x10-6K-1, corresponds with the one of the greater part of materials used in the manufacture of machines tool. The big surface of catchment of the highly valued catchment monocampo does to these insensitive devices, to a large extent, to the local pollution.
The linear systems of measure LF 185 and LF 485 characterise , besides, by a high rigidity in the steering of measurement, an essential requirement for a high precision of path in a machine tool. On the other hand, the little mass of his mobile components contributes to an excellent dynamic behaviour.
The linear and angular systems of average Heidenhain constitute from does years the first election for machines tool of precision when it treats to fulfil the high requests regarding precision, reliability and productivity.
