Quote:
Originally Posted by Dave McLaughlin
Hal was a bit quick to insist that we are looking for an alternative to keyed shaft. We encountered a small problem with holding one of our keys in place, but we have already figured out a way to address the problem. Thank you for the quick suggestion of hex shaft, but we intend to stick with the keyed shaft we have now.
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If it is machined correctly the key should have almost a press fit so it doesn't twist around. You can hold it in place by simply having spacers on either side of the sprocket/gear to limit its movement or by using a setscrew.
IMO keyways are MUCH easier to make than hex parts. You need a lot of special tools and skills to correctly machine hex parts. Keyways are very easy.