Heat treating gears

[kamiphloj]

I,m going to bum out most of you hi-HP trannie smashers with a little background on heattreat.I am not an expert,but I may have a little shop time.
Generally,for economic reasons,blanks of a medium alloy steel,like a chrome moly,would be pre-heat treated then made into gears.These steels don't get real hard,like Rc 34 or so.To get a hard gear,the gear blank would be pre-machined with extra finish steel left on.Then,thru nitriding or casehardening a hard surface,tough core part is made,but it gets heated to a dull red 1400 f or so.At this point,the crystals change,then the steel is quenched.Warpage and size change are inevitable.The gears would not be usable till it was finish machined,probably ground.All that costs.To retro-heattreat existing gears is unlikely .High production gears are also made by powdered metal processes,requiring big investment.
To have something custom made,better start with a set of Toy engineering drawings.Reverse engineering has its pitfalls.Trannie parts are quite precise.
I don't mean to put a wet blanket on the fun of imagination.I'm suggesting the devil is in the details.Unless you have a great deal of resources(Powerball) or unless a niche market manufacturer can apply economy of scale ,its a good idea to be sure you can get all the way there before you get halfway there.
There are only so many transmissions.
Titanium nitride may have some small potential.kamiphloj

[ARCHINSTL]

Unless you have a great deal of resources (Powerball)...

Great line !
And Thanks for the information as well.
Tom M.