Re: [CBQ] Re: CB&Q 6100

[Sam Cook <trains@sjcook.com>]

If you would look at a cross-section of many/most freight wheels, the web is 
not flat, but rather has a dished shape or an s-curve.
This is for stress relief.

Sam Cook, Milan, MO
===================

Mitch wrote:
> How come freight car wheels didn't have them?  They were cast iron at the 
> time also.
> Mitch
>
> --- In CBQ@yahoogroups.com, Sam Cook <trains@...> 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 /<soocarman79@...>/* wrote:
>>>
>>>
>>>      From: Mitch <soocarman79@...>
>>>      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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