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Old April 18th, 2008, 08:06 AM   #13
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i'm just a botanist but, if i were to make say a shaft like that one I would probably have it made 1 piece. By welding there is not a enough cross section to carry the torsional load on the shaft, especially since the load will be fully reversed. I'm not sure were this shaft is in your doubler but, a save design would be to make it out of round stock say 4140 or equivalent and carburize or induction harden (probaby for 1 piecec carburizing would be easier). If you give me the diameters and approximiate torque carried by the shaft I could give you a ball park spec on hardness and case depth needed. It looks like a short shaft from the pics but, with any heat treat you would want to check the T.I.R. and straighten if necessary.
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