[modeleng] Re: Needle roller bearings

Hi Harry, and David

This of course begs the question- how are they supposed to be lubricated? - 
are the sealed type deemed to be sealed for  life?

Regards
Ron

----- Original Message ----- 
From: "Harry Wade" <hww@xxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Thursday, August 21, 2008 2:34 AM
Subject: [modeleng] Re: Needle roller bearings


>I did exactly this on my 2X Tich.  I wanted to use the hardened inner race 
>so I reworked the journal so as to bring an axle stub end of decent 
>diameter through to the wheel faces.  In order to accomodate the bearings 
>and sleeves, yet keep things near to the original journal envelope a few 
>compromises had to be made and a balance struck.  This wasn't as easy as it 
>might spound.  Now, hearing Baggo's very interesting experience (and data), 
>I'll think seriously about going IR-less on the next job.
>
> I learned from experience that when using drawn cup needle roller bearings 
> (DCNRB) it's important to adhere as closely as possible to the 
> manufacturer's press fit recommendation.  I also am a proponent of dust 
> seals, especially on the inboard sides, but between manufactured neoprene 
> seals and O-rings a decent seal is relatively easy to arrange.
>
> I also like central oiling and an oil hole in the cup is a necessity for 
> this, however dispite what the catalogues say, DCNRBs with factory oil 
> holes are becoming scarse to non-existant.  I used one of the single most 
> widely used sizes of bearing from Torrington for my Tich, and OH (oil 
> hole) type were listed everywhere, BUT they were't actually available, 
> anywhere, even at he Mfg.  They would gladly manufacture my OH bearings 
> for the paltry sum of $250 each.  I could have them at the regular (and 
> very reasonable) price IF there was a run plannned, but there was no 
> demand, so no run was planned.  So much for the "Can-do" spirit in the 
> USA.  I ended up putting oil holes in my shells using a diamond burr in a 
> hand grinder and flushing fastidiously with pressurized solvent afterward. 
> So far so good.
>
> After seeing the great difference in rolling resistance between stock with 
> needle or roller bearings and those with plain bearings in operations at 
> our club, I decided to always install rolling bearings of some kind on 
> everything possible.
>
> Regards,
> Harry
>
> -----Original Message-----
>>From: David Archibald <deeja9@xxxxxxxxxxxx>
>>I fitted them to my 5"g loco. I used plain steel axles and hardened 
>>sleeves, but I recessed the axles where the sleeves go so the outside 
>>diameter of the sleeve is exactly the same as the axle.
>
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