Thin Section Bearing
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