Can one nitride mild steel? Nitride is a thin layer and it almost precludes
 regrinding. If a groove is more than .003 deep a nitrided end housings
 is scrap. Also it can't be redone with embedded steel in an alloy casting
 because of the high temp required.

 I like the idea of through hardening as regardless of the
 depth of the wear the wear surface can be reground. Lycoming claims

through

 hardened steel cylinders. .035 4130 steel sheet is cheap here in the US.

 Paul Lamar

Why not make the surface out of cast iron slabs about 5/8" thick and mate the
aluminum to the back of it with 6 10-24 flathead socket heads. A bit of
Holomar or GE bathtub silicone is all you need between the aluminum and the
iron because the case bolts will supply several tons of sealing power. We
already cut through the inner and outer "O" rings to make a bridge ports and
seal the 1/16" strip of aluminum that is left with bathtube caulk. Haven't
lost one yet.
Lynn E Hanover

5/8th of an  inch? Way too heavy Lynn? We are thinking .035 inches thick.

Paul Lamar
 
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