1. Rollin’ Rollin’ Rollin’ By Nathan Powell And Jonathan Parkinson

2. Classifications Radial Thrust Tapered

3. Support only radial loads Radial

4. Thrust Supports only axial loads

5. Tapered Able to carry combinations of thrust and radial loads

6. Why Rollers? Support larger static and dynamic loads than ball bearings Less expensive for larger sizes and heavier loads than ball bearings.

7. Roller Vs. Sliding Advantages of Roller Bearings Low starting and operating friction Can support combined radial and thrust loads Less sensitive to interruptions of lubrication No self-excited instabilities Good low-temperature starting Can seal lubricant within bearing and “lifetime-lubricate” Typically require less space in axial direction Machine Design by Norton (676)

8. Roller Vs. Sliding Disadvantages of Roller Bearings May eventually fail from fatigue Require more space in radial direction Poor damping ability Higher noise level More severe alignment requirements Higher cost Higher friction (than hydrodynamic sliding) Machine Design by Norton (676)

9. Rolling Bearings

10. Vendors Micro Miniature Bearing Co., Inc. –www.mmbbearings.comwww.mmbbearings.com Del-Tron Precision Inc. –www.deltron.comwww.deltron.com Berg, W. M., Inc –www.wmberg.comwww.wmberg.com Stock Drive Products/Sterling Instruments –www.sdp-si.comwww.sdp-si.com

11. The Torrington Co. –www.torrington.comwww.torrington.com Messinger Bearings Corp. –www.messingerbearings.comwww.messingerbearings.com RBC Bearings –www.rbcbearings.comwww.rbcbearings.com *The Bearing Detective –www.emersonbearing.com/prods.html#bdwww.emersonbearing.com/prods.html#bd Nachi Tech –http://www.thomasregister.com/olc/nachiamerica/cylind.htmhttp://www.thomasregister.com/olc/nachiamerica/cylind.htm

13. Torrington manufactured its first bearing over 80 years ago. Significant product innovation dates from the early 1930's, when our engineers developed the drawn cup needle roller bearing, the outer ring of which is press-formed from strip steel rather than machined. Other technical breakthroughs have included: the needle roller thrust bearing, drawn cup roller clutch, wide inner ring bearing with eccentric locking collar, aircraft control bearings, the screwdown roller thrust bearing for metal rolling mills, and the innovative, assembled camshaft. Many specialized products have also been designed for specific applications.