[modeleng] Re: Needle roller bearings

Hi All,

Wyko used to to be a UK distributor of needle bearings - try a Google search 
for their local office.

Failing that, I know SKF, NTN, RBC, Koyo and INA bearing companies make 
various ones. Again a google will turn up their local offices and their 
websites all have a fair bit on engineering info including recommended 
lubricants usually. If you have yellow pages phone directory you can check 
under "industrial power transmission" and find local belt bearing and drive 
supply firms.

Good luck, Jeff Dayman


>From: "Clif Walker" <clif.gwr@xxxxxxxxxxxx>
>Reply-To: modeleng@xxxxxxxxxxxxx
>To: <modeleng@xxxxxxxxxxxxx>
>Subject: [modeleng] Re: Needle roller bearings
>Date: Thu, 21 Aug 2008 20:06:47 +0100
>
>Hi Ron and All,
>
>I have often thought about fitting needle rollers but where do you obtain
>the actual needle rollers?
>
>Regards
>
>Clif
> >
> > I have fitted drawn cup needle roller bearings to all the axles of my
> > 2½" 4-8-4 Helen Long. The bearings run straight onto silver steel axles
> > and the usual side play is allowed so the axle can float from side to
> > side. I don't think you will have any wear problems - the axles and
> > bearings will outlast the rest of the loco! Most of todays loco
> > designers use this combination.
> >
> > There was some discussion about needle roller bearings on another forum
> > and some members seemed concerned about the life of plain silver steel
> > axles. As a result of this I conducted an experiment using a 10mm bore
> > bearing running on a silver steel axle as fitted to Helen. I connected
> > the axle to a motor running at 1440rpm and hung a 16.5 pound weight on
> > the bearing to simulate the load. This was the equivalent of a 2½" 0-6-0
> > loco weighing 99 pounds - a much greater loading than in real life
> > (Helen weighs about 45 pounds). The 'axle' was left running for a total
> > of 230 hours which in Helen's case would have equaled a distance
> > travelled of 3,400 miles! After this, there was no measureable wear on
> > the axle at all, only a slightly matt finish to the bearing surface. You
> > can see the experiment here:
> >
> > 
>http://www.baggo.copperstream.co.uk/me/locos/25inch/helen%20longish/helen19.htm.
> >
> > I intend to fit needle rollers to my Simplex axles which are 3/4"
> > diameter and will again be silver steel.
> >
> > John
> >
> > Ron Head wrote:
> >> Hi chaps
> >> Does anyone have experience of fitting needle roller bearings to
> >> locomotive axles, that they would like to share?
> >>
> >> I want to fit drawn cup sealed needle roller bearings to a 5" gauge
> >> battery driven diesel shunter.  Ideally, I'd like to fit hardened 
>sleeves
> >> to the axles, but there isn't space to do this.  However, the axles are
> >> of silver steel.
> >>
> >> The loco has six wheels, and so the middle axle will need to have some
> >> side play.  If the axle is allowed to float through the bearing, there
> >> will be sliding instead of rolling contact between the rollers and the
> >> axle, and I wonder if there might be a problem with wear on the axle?
> >>
> >> Would it be better to constrain the bearing on the axle in some way, 
>and
> >> allow the axlebox to move in the horns?
> >>
> >> Over to you guys!
> >>
> >> Regards
> >> Ron
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