[modeleng] Re: Steel Wheels
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Thu, 17 Nov 2005 17:55:39 -0800 (PST)
Ever consider saving yerself a lot of trouble and
avoid the risk of burns, busted castings, etc, by just
using a simple "press fit" with some Loc-Tite?
Al Messer
--- "R.L. Roebuck" <rlr20@xxxxxxxxxxxxxxxx> wrote:
> 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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