Quote:
Originally Posted by javadog
We ever going to learn all about this failure?
It's been 4 1/2 months and we're not going to get any smarter, so new guesses may not be forthcoming.
JR
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Using a keyway like that to transmit torque is a big no-no under most circumstances.
An interference fit between the hub and the shaft would be optimum so the keyway would not see any shearing forces.
Also I'm guessing the keyway was cut with a standard end mill, leaving sharp edges. Stress riser city.
Design the hub with a taper lock or standard interference fit of .001" per inch of dia. up to 2", then additional .0005" per inch after.
If it's belt driven, make sure proper tension is maintained. Too loose can do that more than too tight, snapping a string like.
Have em cut the keyway in a way that eliminates the sharp edges.
If it's direct drive tell em to use a good laser alignment system to get the alignment just right to reduce vibration.
Don't have enough info to recommend a material upgrade.