[modeleng] Re: Needle roller bearings

Hi David

I get the idea.  I take it your bearings have oil holes in the casing - did 
you buy them like that, or did you have to do as Harry did, and put them in 
yourself?

Regards
Ron

----- Original Message ----- 
From: "David Archibald" <deeja9@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, August 22, 2008 7:37 AM
Subject: [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
> axle. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, 
> send
> a blank email to, modeleng-request@xxxxxxxxxxxxx[4] with the word
> "unsubscribe" in the subject line. MODEL ENGINEERING DISCUSSION LIST. To
> UNSUBSCRIBE from this list, send a blank email to,
> modeleng-request@xxxxxxxxxxxxx[5] with the word "unsubscribe" in the 
> subject
> line.
>
> --- Links ---
>   1 mailto:hww@xxxxxxxx
>   2 mailto:modeleng@xxxxxxxxxxxxx
>   3 mailto:deeja9@xxxxxxxxxxxx
>   4 mailto:modeleng-request@xxxxxxxxxxxxx
>   5 mailto:modeleng-request@xxxxxxxxxxxxx
> MODEL ENGINEERING DISCUSSION LIST.
>
> To UNSUBSCRIBE from this list, send a blank email to,
> modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject 
> line.
> 

MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.

Other related posts: