[Fot] Verifying if a crank surface is nitrided

[Scypher@USA.com]

I will give this a try tonite.

Can you explain salt bath nitriding ?  I've only heard of plasma/ion  
and furnace nitriding.

Do you do this yourself, or do you have someone do this process?

Thanks
-S


On Jul 15, 2007, at 5:15 PM, mattspit at att.net wrote:

> Most hardness tests rely on making a dent in the material or  
> scratching it.
> All my nitrided parts are black, when fresh, but all nitrideing is  
> not the same. I use salt bath nitriding.
> If the crank is black try touching it lightly with a file in an area  
> other than the journal. It should feel hard and not cut it.
> Then go the the jounal with the file, try to test it on a place  
> where the bearing does not ride, if it cuts it, it need to be re- 
> nitrided, and perhaps gorund again. If it feels hard like the other  
> part of the crank it is probably fine.
>
> -------------- Original message ----------------------
> From: "Scypher at USA.com" <scypher at usa.com>
>>
>> This is the problem.  The previous owner doesn't know the history and
>> nor do I....  I'd like to know if there a test that can be done (ie
>> surface hardness)
>>
>> Thanks
>> -S
>>
>>
>> On Jul 14, 2007, at 2:16 PM, "Chuck Arnold" <triosan at gmail.com>  
>> wrote:
>>
>>> I had a stock sized one nitrited, then needed to get it to .010
>>> under [burned a rod bearing running with no oil pressure].  Mt
>>> engine builder said no problem -- nitriitng is good for at least .
>>> 020.  So it depends on at what stage of their grinding life they
>>> were at when nitrad
>>>
>>> On 7/14/07, Scypher @ USA. com <scypher at usa.com> wrote:
>>> I have a number of spare spit 1500 cranks that were clearly nitrided
>>> at some point in their life, but are at the 020 030 and even 040  
>>> under
>>> stage of their life.
>>>
>>> How do I determine there is enough of a nitrided layer left?  I need
>>> to decide about prepping a new crank and nitriding, or turning  
>>> down an
>>> already prepped crank to the next size.
>>>
>>> Can anyone verify if stock 1500 cranks came with any nitriding from
>>> the factory?
>>>
>>> Thanks
>>> -Scott
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>>>
>>> -- 
>>> Chuck Arnold
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