CROSS SECTIONS OF THIN SECTION BALL BEARINGS

THIN SECTION BALL BEARINGS

PART NUMBER DESIGNA TION

THIN SECTION BALL BEARING SELECTION

THIN SECTION BALL BEARING SELECTION

THIN SECTION BALL BEARING ENGINEERING DATA

The methods, equations, and technical data presented in this section allow the user to select the correct

bearings and estimate their performance for a wide range of applications. For applications with severe or

unusual operating conditions, MONTON is prepared to provide an in-depth analysis and recommend the most suitable bearing arrangement.

Where standard bearings cannot be used, MONTON can meet the application requirements with a special bearing design specifically tailored for optimum performance.

Contact ourSales Engineer for special sizes, materials, application requirements, dimensions and tolerances.

Capacity and Fatigue Life of Ball Bearings

The BASIC DYNAMIC RADIAL LOAD RATING, C, or “dynamic capacity”, for a ball bearing is the calculated,

constant radial load at which 90% of a group of apparently identical bearings with stationary outer rings

can statistically endure 106 revolution of the inner ring. ANSI/ABMA Standard 9 with correction factors for race curvatures was used to calculate the catalog ratings.

The DYNAMIC THRUST and DYNAMIC MOMENT LOAD RATINGS are also shown in the product tables. The

ratings shown are a guide for the maximum loads under which these bearings should be operated with either pure thrust or pure moment loading. Thrust ratings are 2.5 to 3.0 times the radial ratings depending on the bearing type and cross section. These load ratings are not additive. For combined radial and thrust loads, an equivalent radial load is to be calculated.

The BASIC STATIC LOAD RATING, Co, or “static capacity”, is that uniformly distributed load, which

produces a maximum theoretical contact stress of 609,000 psi. At this contact stress permanent

deformation of ball and raceway occurs. This deformation is approximately .0001% of the ball diameter.

Axial Preloading

Standard duplex bearings are ground so that there will be a light axial preload induced on the bearing at

nominal conditions. In some applications increased bearing stiffness may be required. In these cases the

duplex grinding can be done such that a heavier axial load is induced in the mounted bearing. This load can be increased or decreased to meet the requirements of a particular application. Consult our  Sales

Engineer for special requirements.

Radial Play

Radial play (diametral clearance) is the distance the inner ring can be moved radially from one extreme position to the other. Standard  Thin Section Ball Bearings are manufactured with enough radial play that some clearance remains after the bearing is properly installed.

When there is negative radial play (diametral preload) there is interference rather than clearance between the balls and the races. As the interference increases, the friction, stiffness and torque also increase.  Thin Section Ball Bearings can be manufactured with customer specified diametral preload or clearance.

Radial and Axial Runout

Radial runout of  Thin Section Ball Bearings is a measurement of the thickness variation of the bearing

rings. The outer ring is measured from the ball path to the outer diameter of the ring, the inner ring is measured from the ball path to the bore. Radial runout is defined as the wall thickness variation of the rotating ring. Axial runout is measured from the ball path to the face of the bearing rings. The variation in thickness measured is the axial runout.

TOLERANCES

Precision Grades

Thin Section Ball Bearings are available in four precision grades. Precision classes P0, P5 and P6. Correspond to ABMA ABEC grades 1F, 3F, 5F and 7F respectively. The tolerances for the bearing bores, outer diameters, radial runouts, axial runouts and radial plays please contact our sales engineer.

Thin section ball bearings are generally used in applicationswith space, weight, and load con straints. Some typical applications for standard  Thin Section Ball Bearings include:

Medical Equipment Machine Tools                         Radar Equipment Textile Machinery

Material Handling Satellite Systems                        Antenna Pedestals Packaging Ma chin ery

Aerospace Scanning Equip ment                            Optical Equipment Semi-Conductor

Rotary Joints Manufacturing Equipment                 Military Turrets Slip Ring Assemblies

Robotics Harmonic Drives                                       Speed Reducers