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Techno Linear Motion Catalog 21 Technical Information Flat race, flat seat bearings consist of two flat washers and a ball retaining assembly.  They are used when the ball retainer assembly must carry thrust loads without restraining shaft oscillations or flexures. They work well with light loads and are very economical. Grooved race, flat seat bearings are the most common type of thrust ball bearing.  They consist of a shaft mounted small bore washer, a large housing mounted bore washer, and a ball retaining assembly.  Grooved race bearings have a load bearing capacity approximately 4 times greater than flat race bearings. Banded thrust ball bearings are self-contained, have grooved races, have a stationary and rotating face with full ball complement, and are encased in a containing band.  These bearings are most commonly used where the bearing's outer circumference must be protected from contamination, for blind installation, or where separating forces cause substantial axial motion of bearing components. Aligning grooved race bearings are a variation of grooved race bearings, and are available in single and double  acting  types.   Aligning  members  compensate  for  initial  misalignment  due  to  shaft  deflection  or mismatch, while allowing uniform distribution of the load through the bearing.  The double-acting type carries thrust in both directions. Linear Bearings are most commonly used in linear motion applications.  This type of bearing is used when loads are to be supported as the bearing rides back and forth along a shaft.  Each raceway holds balls in rolling contact between the shaft and inner bearing race of the bushing.  The remaining balls recirculate freely in the back side of the clearance in the ball train sleeve.  A retainer is usually provided so that when the bearing is removed from the shaft the balls stay in place.  Linear bearings are as easy to install as a plain bearing, while utilizing the advantages of rolling contact.  Among the important factors when considering load  capacity  of  a  linear  bearing  system  are  life  expectancy,  shaft  hardness,  and  load  orientation  with respect to the ball trains.  Typically, if a lifetime of more than 2,000,000 inches is required, or if a shaft hardness  of  less  than  Rc  60  is  specified,  then  the  load-carrying  capacity  of  the  bearing  system  will  be reduced. Linear  Bearings  are  the  most  commonly  applied  bearing  type  in  linear  motion  systems.    Clearly,  many applications involve using two sets of double linear rails, with two bearing blocks on each rail.  In this case, the load found on each bearing block is of interest when selecting the bearing components.  There are three basic orientations for the bearing system and loads, and each case is represented as follows. Horizontal Translation with Normal Load:  when a normal load is applied to a horizontal bearing system, the loads on each bearing are found by using the following equations.  The equations still apply if the load is acting inside of the carriage mounting surface area.  The orientation of the applied load with respect to the bearing system is the important feature to consider.  This means that these equations can still be used even  if  the  orientation  of  the  translation  is  not  horizontal,  as  long  as  the  load  to  bearing  relationship  is preserved. Load-carrying balls 3–––––––––––––––––––––––––––3 3––––––––––––––––––3 Recirculating balls in clearance