[Fot] Verifying if a crank surface is nitrided

[mattspit at att.net]

look at htpp://houstonunlimitedinc.com
It explains it.

-------------- Original message ----------------------
From: "Scypher at USA.com" <scypher at 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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> >>>
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> >>>
> >>>
> >>> -- 
> >>> Chuck Arnold
> >> _______________________________________________
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> >>
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