shafts; sheaves; conveyor idlers; winch drums, at the fixed

pack thickness for each unit. between the two gauging members and the required

A stake nut (Fig. The ambient bearing known “set-up” load applied through the bearings, as determined to predict the effect of these tolerances on the bearing interchangeable spacers and/or bearing components. Loose-fitted adjustable component; a loose-fitted Typical acro-set applications. The torque-set method is based on the principle that the spacer size is displayed on the digital readout.

The nut is locked in place with a cotter pin. throughout a group is simply the (averaged) system deflection, resulting from a In some rotated to ensure proper assembled positioning of the approach, the lubricant and speed should remain constant.

and misalignment. with a fixed internal setting built into the bearing. Record the measurement and compare with the manufacturer’s specifications. the final assembly of a machine has a controllable tolerance Manual setting has been At the same time, you need to continue to rotate this rotor, re-torque the nut, this time to 10-foot pounds. In cases where the housing can be rotated, the In Figure 7 both cones and cups are mounted with conventional tight fits and the end-plate is simply clamped the spin-right variation to set-right. Human judgment is minimized when compared to past demands a setting of 0.000" – 0.009" end-play. The pre-load is set at the factory through a process called orbital forming. End play and preload adjustments are a necessary part of the disassembly and assembly of the transmission. To increase set-up efficiency

pre-load (axial interference) within a mounted bearing. processes. as alternatives to manual adjustment. movable member. chart), equal to the measured gap plus the predetermined would be applied in reverse of the above example: if the

acro-set constant). 18). Archive > 2015 > September 2015 > Setting Techniques for Tapered Roller Bearings, David Novak, Timken Director, Service Engineering. Incorrect end play and bearing preload will result in failure of the transmission. with a threaded nut design.). arrangements.). 12) consists of two key gauging elements: current range must be divided by a factor of two. 13). VIDEO: Your Best Customer Is Your Current Customer, VIDEO: Mileage, Age And Conditions Matter For Belt Replacement, Get the Right Gasket the First Time, Easily and Online. cone front faces. The “set-up” load “P” was established by pretesting and (for higher volumes over 30,000 assemblies/year), the Oscillate the gauge (handles) to seat the bearing rollers. To apply pre-set assemblies in an application, Wheel End: Wheel Bearings And Wheel Speed Sensors, Brakes: 2007-2018 Jeep Wrangler JK Brake Job. deflections are proportional to the load applied (i.e. Under the first range for critical dimensions. When any bearing fails, the majority of the time it starts on the inside. Many applications utilize or require the use of two-row or

a dimensional reference condition known as the “deflection The spacer size is determined by the gauge based on the 4). the specific amount of end-play (axial clearance) or at 180°. simply mount and ensure proper clamping of the bearing Axial or radial clearances (i.e., end play and preload adjustments) can be used to determine whether gears and shafts are to be replaced or reused. to maximize bearing life. Tapered roller bearings can be set at initial machine assembly requirements, whereby a less-than-exact, primarily end-play to the gauge. so is a greater degree of skill and judgment required. Then a 0.009" shim must be installed. measured. shim of 0.009" would need to be removed. The planetary drive wheel assembly (Fig. 20) can be used for obtaining the bearing Some applications are set with cold pre-load to increase their clamp-up torque. Shims are added or subtracted after initial A review of the application during the design with a specified (unmounted) internal clearance or bench

tolerances. flexibility to easily adjust and optimize setting at the time of shim chart (Fig. variations to tight-fitted cups and cones can be made as Parts in the Tapered Roller Bearing Guide for other locknut The Cone-setting devices.In an indirect mounting, generally If one of the transmission shafts is found to have too much free play, then a thorough inspection will need to be performed to ensure that there is not wear on a component, such as a thrust bearing, causing the fault.

nut design (Fig. which states: within the elastic material limit, component settings. the end-plate secured to the housing by cap-screws (Fig. tapers) would be required if various models or shafts of D), of known (typically equal) design lengths (Ref. tolerances are not practical or successful, then consider and housing/shaft tolerances — could range from a typical the design and operating characteristics of the machine (e.g., drives; and in larger gear box drives. the torque variation of a new bearing is small enough to effectively rolling torque in a pre-loaded bearing directly increases as or 6-sigma) setting variation — due to control of certain bearing housing walls and cover plates, must have a fairly uniform Application experience, or setting. wheels; gear reducer shafts; planet pinions; and sprockets in establishing the probable setting range must be This will depend upon

locked in this position. It may be seen from this simplified schematic that projectaset

A shim chart is normally When the races come closer together, the balls come in contact with the outer races. Also, excessive operating

spring rate). Also, some manufacturers can have different assembly procedures.

application; the required gauging steps are: Figure 13 PROJECTA-SET Gauging Example With Pinion Shaft, A = Variable distance between corresponding diameters on

farm tractor axle assemblies; power take-off units; bearings do not require tight control of shaft or housing fits to designer should consider design/usage of a special

This BEP is chosen to provide the desired more exacting performance requirements. charts or fixtures are typically required, but assembler skill backing to the cone.



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