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  1. caoimhin1

    Double Row Angular Contact Bearing Axial Load Capacity

    As always, when someone asks "what load can I put on a bearing", the answer is "what lifetime do you want". If Fr is zero, then just use the equations you gave above to calculate the dynamic equivalent load. For a 25degree, it will be P = 1.41 x Fa
  2. caoimhin1

    Bearing Damage? No.1

    Need a lot more info like brand of bearings, part number, speed, temperature, how long have they been on....
  3. caoimhin1

    Unfamiliar Bearings T7014CTSULP3 (manuf. RHP)

    For the record, its an ultra high speed precision single universal light preload angular contact ball bearing. Available from NSK.
  4. caoimhin1

    Unfamiliar Bearings T7014CTSULP3 (manuf. RHP)

    The "T" is the RHP designation for Ultra High Speed bearings. Basically it has smaller balls than a standard Super Precision bearing giving it higher limiting speeds. NSK will stock this, just ask your bearing distributor.
  5. caoimhin1

    Tapered roller bearing vs Drawn cup needle + needle thrust bearing

    900N radial load, 90rpm? Why not just use a mounted ball bearing unit? Takes care of alignment, integrated sealing, easier to install than tapers and no housing design necessary. h8 tolerance on the shaft.
  6. caoimhin1

    Thrust bearing design

    - For a bicycle, fatigue life is not going to be the issue. Work out the maximum shock load that you expect to see in operation and compare to the static load ratings in the bearing catalogues. I'd aim for 10-20% max of the catalogue static load ratings. - 62 Rockwell hardness is typical for...
  7. caoimhin1

    Ball bearing life span calculation

    Everything is fine, but you could make it even better by choosing a 6209 or 6009 and thereby saving yourself a few pennies.
  8. caoimhin1

    Bearing Failure

    I've never heard of a bearing company supplying a non-greased shielded bearing. Even on large deep groove ball bearings which might have a removable shield. The risk of cross contamination of ungreased product with greased product would be too high. One of the basic questions is to make sure...
  9. caoimhin1

    Internal Clearance in Angular Contact Ball Bearings

    While it would probably involve a major redesign, a four point contact bearing, e.g. QJ306, would eliminate the skidding effect of an unloaded row. Btw, when you say that the increased heat caused excessive preload, you mean radial preload? Also, don't limit yourself to SKF, it would be worth...
  10. caoimhin1

    Transaxle Bearing Setup Questions

    Re: the bearing taking up expansion, I'd agree that you don't necessarily need to have a floating bearing when the distance between the bearing centres is small, and the temperatures aren't out of the ordinary. Maybe use a C3 clearance for peace of mind.
  11. caoimhin1

    Stepped shaft, set screw, or collar to locate pillowblock bearings?

    If its purely radial load, then a stepped shaft is not required...unless you need a definite datum point to locate the bearing relative to the shaft. Pillow block units usually use either set screws or eccentric locking collars on their inner rings for location. Use the eccentric locking coller...
  12. caoimhin1

    Axial Clearance for Locating Ball Bearing

    Rotating load, so they are correct to specify an interference fit on the OD, similar to a vibrating screen application. I normally never specify axially locating a bearing by fit alone. It might be a pain to accommodate, but adding a circlip can give some peace of mind against the bearing...
  13. caoimhin1

    What are your thoughts on sugested bearing seat mounting tolerences?

    For high speed machine tool, I can't comment. For general industrial applications, most end users jaws drop when told what positional tolerances they need to hold. Despite what everyone says about positional tolerances being very important, in reality most industrial machine makers are unable...
  14. caoimhin1

    Bearing OD Fits or Anti-Rotation Features

    Yes. For example: http://www.nskeurope.com/cps/rde/xchg/eu_en/hs.xsl/innovative-creep-free-bearings.html These ones are fitted to the bearing by the bearing manufacturer. Unless using large volumes, its usually more cost effective to machine the grooves in your housing, fit o-rings yourself...
  15. caoimhin1

    Bearing OD Fits or Anti-Rotation Features

    For general applications...yes, fits as recommended by the manufacturers are fine. For general industrial applications for ball bearings, this is usually H6 fit for the housing and k5 for the shaft. 30000 rpm is quite fast, although it depends on the size of the bearing. A precision ball...
  16. caoimhin1

    pillow block bearing insert rotation

    Most pillow blocks do not have an anti rotation pin in the outer diameter anymore. This was typical of Asian style housings, I think Asahi units might still have them. Most now have a transition fit between the spherical outer and the casting, like RHP. It shouldn't be too loose, but you...
  17. caoimhin1

    chassis dynomometer bearing noise

    If there was a problem with the bearings, such as corrosion, you would expect the rumbling noise to be present over all speeds. Maybe some resonant frequencies with some other componenents.
  18. caoimhin1

    "twisting" force on shaft in journal bearing

    "Moment load" is probably the best description. Its the type of loading scenario you get with cantilevered loads. e.g. a shaft supported by two bearings with a tensioned belt pulley at one end. For ball and roller bearing, any bearing which can take the load is fine. The direction of load is...
  19. caoimhin1

    too smooth journal finish ?

    Also for dry running polymer bushes where PTFE transfer is necessary; e.g. Glacier recommend minimum 0.3um Ra for most materials.
  20. caoimhin1

    Open top bearing?

    Or Cooper split spherical roller bearings: http://www.cooperbearings.com/

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