[TheForge] scrap plate steel

[Schade]

You can tighten a loose collar the same way. Put a c clamp or
vice grip tight on the collar. Heat to red. As the collar expands it
upsets on itself. Quench with a wet rag or whatever. Do over
if necessary.

Bpb
_______



On Oct 16, 2004, at 12:26 AM, Peter Fels And Phoebe Palmer wrote:

> 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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