APTSURF from NSK is a new range of high precision, high performance cylindrical roller bearings designed for the main spindle of machine tools. End users will benefit from enhanced spindle reliability and an improved surface finish, particularly in lathes and turning centres, principally through a 55% reduction in rotational vibration levels. A further advantage is 60% extended life, which is achieved through optimisation of the bearing's internal design and innovative manufacturing technology.
In recent years, the need for better machining quality and greater reliability has expanded in line with expectations from an increasingly competitive component manufacturing marketplace. With APTSURF, NSK set about addressing this issue in a number of ways; firstly through the precision enhancement of each bearing part. Here, the RMS (root mean square) value of vibration at 2000 rpm is decreased by 55% in comparison with conventional bearings. In turn, the surface finish quality of parts produced by the lathe will also be improved.
Further enhanced features that will be of interest to machine tool builders include an increase of 15% in the dynamic capacity, and 60% longer operating life, again in comparison with conventional bearings.
The bearings are available in outside diameters of up to 360mm and with an accuracy rating of P4 or higher.