Re: [CBQ] Re: CB&Q 6100

["John D. Mitchell, Jr." <cbqrr47@yahoo.com>]

Freight and passenger car wheels are made by a special process called "chilling". A special kind of steel ring(called a "chill) is placed around the hot metal when it cools. The cold steel draws heat out of casting and causes the tread to be hardened.

--- On Wed, 2/27/13, Mitch <soocarman79@yahoo.com> wrote:

From: Mitch <soocarman79@yahoo.com>
Subject: [CBQ] Re: CB&Q 6100
To: CBQ@yahoogroups.com
Date: Wednesday, February 27, 2013, 5:46 AM

 

How come freight car wheels didn't have them? They were cast iron at the time also.
Mitch

--- In CBQ@yahoogroups.com, Sam Cook wrote:
>
> As former foundryman....
> Casting a solid wheel is difficult because of the shrinkage when the iron cools.
> It shrinks and will pull cracks in the casting.
> The holes (or spokes) allow some flexibility, avoiding cracks.
> Curved spokes is even better than straight spokes.
> Iron shrinks 1/8" per foot.
> Also saves material and makes the finished part lighter and easier to handle
> with very little sacrifice in strength.
>
> Sam Cook, Milan, MO
> ===================
>
> John D. Mitchell, Jr. wrote:
> >
> >
> > It made the wheel a little lighter but I think the main reason behind it had to do with the casting process.
> >
> > --- On *Tue, 2/26/13, Mitch / /* wrote:
> >
> >
> > From: Mitch
> > Subject: [CBQ] CB&Q 6100
> > To: CBQ@yahoogroups.com
> > Date: Tuesday, February 26, 2013, 6:07 AM
> >
> > I was looking at the picture of the 6100 that was posted and noticed the front wheel. There are 4 holes in the web of the wheel. What is the use in that?
> > Mitch
>

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