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If he wants to know why the keyways are parallel and the key tapered itís not just because itís straightforward to cut a parallel keyway and tricky to cut a tapered one; itís so you stand a chance of getting them apart. You can see on the spec sheet that tapered keys have a 1:100 taper along one side. A taper that slow, locked into a mating one, would be very difficult to split.
My worst worry about dying is my wife selling my stuff for what I told her it cost...
That's what I was thinking, a morse taper needs but a tap and it's solid. Also, when fitting a key I couldn't envisage the bluing reacting how it does after scraping if it was against a tapered bore. It's either be home or not, whereas a tapered key/straight bore shows you the bore riding up the taper.
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