Subject: nitride thickness
From: Rotary Engine
Date: 1/19/2010, 7:34 PM
To: AAA Put this in the To box


Paul,
Does  anyone know how thick the nitriding is on the cast iron housings?  I
am
lapping the irons by hand with permatex valve grinding compound and want
to
know if  i have gone too far.  thanks for any help

Joe  Berki

Only a couple of thou. I think it is .003.

Paul  Lamar



Paul,
Actually .003 inches would be a very thick nitride. Some of my old sources
indicate .0005-.0015 as typical.
Bill Jepson


Is there any way to determine if you have gone too far with lapping process?
Thanks for any help

Joe Berki

You can buy a hardness tester from some of the machine shop
supply houses.

Paul Lamar

-- 
Actually .003 inches would be a very thick nitride. Some of my  old sources
indicate .0005-.0015 as typical.
Bill  Jepson


Is there any way to determine if you have gone too far with  lapping
process?
Thanks for any help

Joe Berki

You can buy a  hardness tester from some of the machine shop
supply houses.

Paul  Lamar


Paul,
That thickness is for the gas nitride process BTW. I don't think anybody
can use the old cyanide process due to environmental concerns. (Justifiable
ones  at that.)
Bill Jepson


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