Inserted racewayՖWireX Biangular roller bearings are used in applications demanding higher preci- sion and stiffness but requiring less static load capacity, such as index tables, positioners, antenna mounts and military gun turrets. Bearing types Օ Four-point contact ball bearings, as well as Kaydons patented 8-point contact ball bearings, are used as swing bearings in cranes, excavators, aerial platforms and other types of construc- tion and material handling equipment. These bearings have also been applied successfully in machine tools, radar and medical equipment. > Section 1 ҩKAYDON Corporation...

Eight-point contact ball bearings The eight-point contact ball bearing was developed by Kaydon to satisfy require- ments for maximum load capacity within a given envelope, especially in larger size bearings. As shown below the eight-point contact ball bearing is an annular bearing with two rows of balls. The unique feature of this bearing lies in the utilization of the Gothic ArchӔ or four-point contact internal geometry in both rows.Functionally, the bearing may be con-sidered to be two single row, four-point contact bearings with adjacent faces.The four points of contact permit each row of...

Section 1 KAYDON ɮ Corporation 2004 Large Bearing Catalog 390 WireX > Introduction To accomplish this universal load carry-ing capability, the bearing is designed with V-groove raceways, providing two roller paths in each ring. The rollers have a length slightly less than their diameter and are positioned so that adjacent rollers contact different sets of raceways, with the axes at right angles to each other. Positioned in this manner the rollers transmit load along perpen- dicular sets of 45ְ contacts. The action of the bearing under various types of loading is thus analogous to that of the...

Large Bearing Catalog 390 KAYDON > ɮ Corporation 2004 > Section 1 Four-Point Machine Tools Contact Ball Custom 10,000,000 6,000,000 1,300,000 Radar (pg. 16-17) 16" to 180" ֕Non- Cranes Ball geared Utility Cranes Aerial Devices Medical Equipment MT-Series Internal 900,000 600,000 200,000 Excavators (pg. 12-13) 12" to 48" ՕExternal RK-Series 140,000 175,000 60,000 (pg.14-15) 20" to 47" Lightweight Non- Military Turrets Four-Point Geared Medical Equipment Contact Plastic To 60" ՕInternal Consult Kaydon General Purpose (pg. 22) Ball External Eight-Point Large Cranes Contact Excavators (pg. 18-19)...

Section 1 KAYDON > ɮ Corporation 2004 Large Bearing Catalog 390 > Introduction Biangular Roller (pg. 22) ֕Internal Radar Roller To 180" External 7,000,000 3,000,000 1,400,000 Military turrets Machine tools Excavators Lightweight Biangular Roller ՕInternal (pg. 22) Roller To 180" External 2,500,000 1,250,000 575,000 Military turrets Roller Three-Row Radar (pg. 22) ՕInternal Cranes Roller To 180" External 18,000,000 12,000,000 4,000,000 Excavators > Stackers & reclaimers Heavy mill equipment Inserted Race ՕNon- WireX > Geared (pg. 18-19) Roller To 120" ΕInternal 1,820,000 1,000,000 370,000 Military...

Accuracy Positioning of the rotating member relative to the stationary structure may be of concern. With the bearing races securely fastened in a round condition on fl at mounting surfaces, the main source of positioning error is internal bearing clearancebearing runouts being small by comparison. See Page 22. > Large Bearing Catalog 390 שKAYDON Corporation 2004 Load > Because a turntable bearing accepts all types of loading, the main concern with load is its magnitude. See Pages 9-11 for > ΖIntroduction Many factors must be considered in selecting and applying an antifriction bearing. Chief...

Mounting and installation This topic is discussed in detail on Pages 25-31. Normal application Special attention must be given to bearing application whenever conditions are different from those considered normal. For a normal applicationӔ of turntable bearings the following conditions should apply: Vertical axis of rotation Օ > Section 1 KAYDON ɮ Corporation 2004 Large Bearing Catalog 390 Lubrication > Introduction One or more grease fi ttings or lubrica-tion holes are provided in all turntable bearings. Additional lube holes can be furnished on request. For further discus- sion of lubrication,...

Section 1 M BCAR PD sinO > 1 T R > 2 O R O R > 3 R > 4 PD tanO 2 D PD PD = ball pitch diameterO = contact angle R >

Large Bearing Catalog 390 KAYDON ɮ Corporation 2004 Table 6Non geared four-point > The unique דGothic Arch raceway design of four-point contact ball bear- ings provides an exceptional means of handling combined axial, radial and moment loading. The applications for these bearings are unlimited, ranging from heavy-duty cranes to machine tool turntables to advanced medical imag- ing equipment. Kaydon bearings have been manufactured with up to 10 million pounds-feet of moment load capacity.Listed below is a sampling of the many custom-designed four-point contact ball bearings produced by Kaydon....

Large Bearing Catalog 390 KAYDON ɮ Corporation 2004 Kaydon developed the eight-point con-tact ball bearing to provide increased load capacity within prescribed diametral space limitations. These bearings func- tion as two four-point contact bearings mounted together and provide moment load capacities up to 15 million pounds- feet.In addition to the bearings shown below, we can customize a design to fi ll your specifi c requirements. Table 9Internal geared eight-point > (Figure 19) Outline dimensions (inches) Hole data Model Kaydon No. No. P/N OD ID W TO TI BCO holes HO BCI outer Table 10חExternal...

Corporation 2004 Protection The Taper Pin Retainer by qualifi ed personnel for the ball loading hole plug must be removed on rare occasions to inspect raceways or to replace rolling ele- ments or spacers. A hole, approximately 11/4 inches in diameter must be located in both upper and lower mounting struc- tures directly above and below the ΓTaper Pin Retainer, so that it may be removed. (See Figure 42.) In general, Kaydon bearings are de-signed to withstand all normal operating environments. However, if the upper structure does not provide complete cover for the upper bearing, a seal or Flatness...