[modeleng] Re: Steel Wheels O/T Axle end play

How much end play is allowable for axles?

Al Messer

--- Phill Smith <steam@xxxxxxxxxxxxxx> wrote:

> Barry,
> 
> Do it with the "thou per inch" interference fit, and
> shrink them on.
> 
> The best way to do this accurately (and so they
> can't come of through
> continual cornering) is to put a small step on the
> inside of the rim, with a
> matching inner bore in the tyre. When running, the
> forces of the engine
> going around a curve are trying to push the tyre of
> the rim towards the
> frame. To counter this, the shoulder is normally
> made around 80 - 100 thou
> (2 - 2.5mm) wide and 20 - 40 thou in step. There is
> no need for this step to
> be a press fit, but I make it so anyway. It is also
> under the flange so it
> can't be seen.....  But the best bit is that it acts
> as a stop for the tyre
> when it is dropped on, which locates it square, and
> at the correct position.
> 
> Oh........ One other thing. Don't be tempted to
> increase the interference
> fit, as the stresses may be increased enough that
> the rolling stresses
> (compressive stress) may permanently stretch the
> tyre so that it comes
> loose...... I have seen a loco have this problem.
> 
> 
> Cheers,
> 
> Phill.
> 
> ----- Original Message ----- 
> From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx>
> To: "Model Engineering List"
> <modeleng@xxxxxxxxxxxxx>
> Sent: Friday, November 18, 2005 1:48 AM
> Subject: [modeleng] Steel Wheels
> 
> 
> > I have just acquired, at great expense, a piece of
> steel tube 8" I.D. and
> 3/4ins. wall thickness. I am about to start
> machining it to produce six
> steel tyres which I intend to shrink onto three
> pairs of existing, cast iron
> wheel sets (after machining off the current treads).
> The plan is to make the
> tyres with one thou per inch of interference, expand
> them with heat then
> shrink them onto the wheels.
> > Before I pluck up courage to do this job does
> anyone have any advice to
> offer?
> >
> > Barrie
> > MODEL ENGINEERING DISCUSSION LIST.
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> >
> >
> 
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