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
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.
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.
- 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...
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...
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...
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.
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...
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...
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...
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...
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...
