[TheForge] scrap plate steel

[Peter Fels And Phoebe Palmer]

I think the theory here is that one heats a limited area to dull red and 
the surrounding plate prevents it from expanding, so it upsets then  
shrinks flatter  on cooling .

The Millers wrote:

> Actually it is kind of counter intuitive. You heat the convex side 
> then "chill" it with water causing rapid contraction.
> The rapid contraction performs the "shrinking" effect like a shrinking 
> hammer.
>
> You can't do it all at once.
>
> But I watched a guy straighten a 24" buck stay, (I beam used in large 
> power plant boilers) that had a 12 " bend!!
>
> Ray
>
>
> The other model to consider is heating couplings to install on shafts 
> or shrink fits.
>
> If you heat from the outside in the hole will get smaller. If you heat 
> from the inside out it will get bigger.
>
> Ray
> Cincinnati
>
>
> On Friday, October 15, 2004, at 05:02 PM, Gladish Family wrote:
>
>>> In basic terms it was a matter of heating the opposite side and
>>> then cooling with water and shrinking the "dimple".
>>>
>>> Ray
>>> Cincinnati
>>
>> That sounds kind of fun...so, the heat goes in the concave side, right?
>> Then (I'm guessing here) heat until it expands and becomes straight, and
>> stop it in time...
>> Andy G.
>>
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