These are highly rigid and accurate ball screw support bearing often used for the machine tools driving mechanism.
- High axial rigidity High-rigidity achieved by higher contact angle at 60 degrees and an increased number of smaller-diameter balls.
- Small friction torque Friction torque is far less than that of tapered or cylindrical roller bearing. This contributes to accurate rotation by a smaller driving power.
- Pre-adjusted axial play Combination bearings are already adjusted to a suitable preload. Universal combination bearing (SU) furnishes certain preload for all combinations (DB, DF, and other).
- Simple mounting structure A duplex combination of bearings can receive axial and radial loads. Therefore, the installation structure is simpler than when both a thrust bearing and a radial bearing are used.
- Easy handling Inner and outer rings are inseparable, and are easy to handle.
- Superb polyamide resin retainer Uses polyamide resin retainer which is superb to friction and furnishes high precision rotations.
Super precision and spindle bearings are high-precision bearings that are designed for use in machine-tool spindles and other precision applications.
There are four main types of super precision and spindle bearings: angular-contact ball bearings, radial ball bearings, roller bearings, and thrust bearings.
- Angular-contact ball bearingsare the most common type of spindle bearing. A contact angle between the races and the balls is formed when the bearing is in use.
- Radial or deep-groove bearingscan take radial and axial loads to varying degrees, but are most often used when the primary load is in the radial direction. Radial bearings consist of an inner ring, an outer ring, balls and sometimes a cage to contain and separate the balls.
- Roller bearingsare used in rotary applications to replace sliding movement with low-friction, rolling motion.
- Thrust ball bearingsare designed for pure thrust-loads. These super precision and spindle bearings can handle little or no radial loads. The rolling element can be a ball, needle, or roller.
Specifications for super precision and spindle bearings include bore size, outside diameter, and materials of construction. The bearing industry uses a standard numbering system for bearings with metric-diameter bores.
If the bore is hexagonal, then the dimension is measured across the flats. If the bore is tapered, the smaller diameter is specified. For bore sizes 04 and up, multiplying the size by 5 yields the bore diameter in millimeters (mm).
For housed bearings, the outside diameter (OD) includes the housing. For flanged bearings, the OD excludes the flange.
In terms of materials, most super precision and spindle bearings are made of stainless steel, plastic, or ceramics. Products that are plated with cadmium and chrome are also available.