Productores Primarios (al 31 de diciembre de 2007) - Senasa

General Properties• Environmental Sensitivity‣ Because air is always flowing out of the bearing,aerostatic bearings are self-cleaning.‣ The escaping air is not generally collected, so it is notnecessary to keep chips and cutting fluid out of thebearing area, although it is still preferable to use bellowsor sliding way covers to keep the bearings surfaces cleanand prevent them from being damaged.‣ In addition, unlike bearings with oil lubrication, there isno mess associated with air bearings.18-21General Properties• Seal-Ability‣ Aerostatic linear bearings generally ride on rectangular or dovetailrails, so it is not difficult to seal them if required. Rotary motionaerostatic bearings usually do not need to be sealed.• Size and Configuration‣ Aerostatic bearings take up very little space themselves, but theplumbing requirements may be significant. It is generally desirable tohave only one hose coming to a bearing, so the bearing itself maylook like a block of Swiss cheese after all the drilling is done in orderto get the air to all the different bearing pads. Kinematic padarrangements are not necessary because the bearings act likeconstant force springs that fill whatever gap exists.‣ As the equilibrium gap changes, the stiffness changes but stiffnesswill always be finite; thus aerostatic bearings are more forgiving ofrail and carriage misalignments, as long as they do not cause the gapto change too much, which could cause loss of preload with sliding or18-22rolling bearings.