That is a pencil diameter hardened steel shaft, breaking that is insane.
THAT feels like an understatement 
Its also worth noting that we run the pullies all the way down on the shaft. If I remember right we use a piece of paper as a spacer for setting them. Unlike some situations where the pully is out towards the end of the shaft and has a lot more side load on the motor.
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Yes, Yes it is. Funny thing is I did not think it was under that much tension at the time.
I feel like that contributed heavily to the situation I had. Was on the Y axis drive on a machine built out of 3/4 MDO board. Ended up designing a jack shaft for lack of a better definition.
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I wonder if that motor had a defect/crack in the shaft? That seems way more plausible than over tightening the belt and breaking it.
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