Aaron Gann Posted May 26, 2009 Share Posted May 26, 2009 I go to school at the tennessee center for technology morristown the auto mechanics class just got finished rebuilding a transmission and gave me the old cogs does anyobdy know what kind of steel this is Quote Link to comment Share on other sites More sharing options...
Aaron Gann Posted May 27, 2009 Author Share Posted May 27, 2009 I go to school at the tennessee center for technology morristown the auto mechanics class just got finished rebuilding a transmission and gave me the old cogs does anyobdy know what kind of steel this is Quote Link to comment Share on other sites More sharing options...
Rob Browne Posted May 27, 2009 Share Posted May 27, 2009 Probably case hardened cast. Quote Link to comment Share on other sites More sharing options...
BeaverDamForge Posted June 1, 2009 Share Posted June 1, 2009 BP0002 Junk Yard and Rail Road Steels | Blueprints 000-100 Accordind to this they might be 3115. They're not cast iron, it wouldn't hold up. Quote Link to comment Share on other sites More sharing options...
alan boyer Posted June 2, 2009 Share Posted June 2, 2009 Most transmission gears are case hardened cast. I have dealt with many broken and chipped ones. Some gears are steel, I'm guessing 4140. Main shafts, the shafts the gears slide onto are normally good solid steel. the shafts that the shifter/slider forks ride on are good stuff as well. Quote Link to comment Share on other sites More sharing options...
BeaverDamForge Posted June 2, 2009 Share Posted June 2, 2009 You sure about that? "Gears in automotive transmissions are usually made from a steel alloy that is later heat treated to be more resistant to fatigue, and then surface hardened to resist wear."How to Rebuild and Modify Your ... - Google Book Search Good chart here:Gear materials, properties, and ... - Google Book Search Quote Link to comment Share on other sites More sharing options...
Charlotte Posted June 2, 2009 Share Posted June 2, 2009 Thanks for the link good info there Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted June 2, 2009 Share Posted June 2, 2009 "Gears in automotive transmissions are usually made from a steel alloy that is later heat treated to be more resistant to fatigue, and then surface hardened to resist wear" Doesn't say a thing on if thery are cast steel or forged steel---or cast and then forged---or not does it. Cast does not necessarily mean Cast iron. Especially as I don't know of any case hardening process for a material that already has so much carbon in it that it precipitates out as graphite. Quote Link to comment Share on other sites More sharing options...
ChrisB Posted June 3, 2009 Share Posted June 3, 2009 Make a steam punk decoration out of the gears. Quote Link to comment Share on other sites More sharing options...
BeaverDamForge Posted June 3, 2009 Share Posted June 3, 2009 "Gears in automotive transmissions are usually made from a steel alloy that is later heat treated to be more resistant to fatigue, and then surface hardened to resist wear" Doesn't say a thing on if thery are cast steel or forged steel---or cast and then forged---or not does it. Cast does not necessarily mean Cast iron. Especially as I don't know of any case hardening process for a material that already has so much carbon in it that it precipitates out as graphite.I took the 'some gears are steel' to mean the others are not... sorry if I got his intent wrong. I had wondered about hardening CI. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted June 3, 2009 Share Posted June 3, 2009 You can cast cast iron with chill plates in the mold to get white cast iron which is quite hard indeed! But further heat treat methods will probably only soften it. Quote Link to comment Share on other sites More sharing options...
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