[modeleng] Re: Steel Wheels

Well, Barrie, whatever method you decide upon, to
secure the tires to the wheels, best wishes and good
luck!

Al Messer


--- Barrie Purslow <bpduo@xxxxxxxxxxxxx> wrote:

> Rich,
> 
> The wheels are already on the axles - and have done
> many miles, such that
> the tread is "hollow".
> 
> Please see my reply to Charles regarding alignment,
> 
> Regards,
> 
> 
> Barrie
> 
> 
> 
> > As far as the 1thou per in interference is
> concerned, is this the norm
> > that is allowed for shrinking cast iron onto steel
> (as if you go for any
> > more you cause the cast iron to crack as it is in
> tension)? But going the
> > other way round, shrinking steel onto cast iron, I
> suspect that you can
> > subject the cast iron to larger loads before it
> goes BANG, but if you are
> > shrinking onto a spoked iron casting, you ought to
> be careful you don't
> > cause the centre boss to collapse. In this case,
> maybe the centres should
> > be machined and fitted to the axles before
> shrinking on the tyres.
> >
> > An alternative viewpoint is to work out how much
> expansion of the steel
> > you can get by heating it, which will ulitmately
> give you the inteference
> > fit.
> >
> > One other thought - best to make sure you have a
> shoulder somewhere on the
> > arrangment, to make sure that the tyre is dead
> square on the wheel when
> > the whole thing goes tight. If it goes tight on
> the 'huh' I suspect it
> > might work itself loose in service, no matter how
> tight an inteference fit
> > you think you've got.
> >
> > Yours,
> >
> >
> > Rich.
> >
> >
> > On Thu, 17 Nov 2005, cbrumbelow@xxxxxxxxxxx wrote:
> >
> >> Be sure your assembly arrangement allows time to
> get the tyres/tires on
> >> and lined up before the temperature difference is
> gone.  It might be well
> >> to leave the exteriors of the tires enough
> oversize to allow truing cuts
> >> once everything has been assembled.  Some might
> even suggest that the
> >> final truing take place between centers with the
> tires on the wheels and
> >> the wheels on the axles.  And, you might want to
> match each tire to a
> >> specific wheel center as you turn the sets.  Am I
> reading correctly that
> >> you will have wheel centers of a nominal 8"
> diameter and an interfereance
> >> fit of 0.008 inches?  Charles
> >> -------------- Original message --------------
> >>
> >>> 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
> >>
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