[modeleng] Re: Needle roller bearings

 
Ron,

I drilled a very small hole up thru the axle box to a larger cavity
(reservoir?) about 3/16" dia and 3/16" deep and put a plug of dense felt
about 3/8" dia above that. Lubrication is by squirting in heavy lube oil
ontothe felt &cavity on top of the axle box, and the oil just oozes very
slowly down thru the felt into the fine hole into the bearing. It is
filteredfrom dirt by the felt, and works just fine, and any excess just
formsa small meniscus where the axle comes out of the axle box, effectively
sealing that end too. A squirt or 2 of oil every couple of months is all
thatis required.

David



Ron Head wrote: Hi Harry, and David This of course begs the question- how
arethey supposed to be lubricated? - are the sealed type deemed to be sealed
for life? Regards Ron ----- Original Message ----- From: "Harry Wade"
<hww@xxxxxxxx>[1] To: <modeleng@xxxxxxxxxxxxx>[2] 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
thejournal 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
thingsnear 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
necessityfor 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
norun 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
everythingpossible. Regards, Harry -----Original Message----- From: David
Archibald <deeja9@xxxxxxxxxxxx>[3] I fitted them to my 5"g loco. I used
plainsteel 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
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