[modeleng] Re: Steel Wheels
- From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Thu, 17 Nov 2005 23:32:25 +0000 (GMT)
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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