Best Way To Cut Tapered Key Seat

The gear is actually the splined center of a slip clutch on a baler. If you look you can see where the friction plates only wear on one end. The new keyway is so I can turn it around and use the other end. Agco wants almost $400 for a new one so I'm going to double my milage on the old one before I pony up for a new one. And if I have time I might just make a new one. I just need to find the right spline hob for the gear hobber and it would be a breeze.
I might be able to do something along the lines you mentioned with a coaxial indicator. I would probably need to make a new, more accurately made, bar to hold the cutter and be able to have the precision to use the coax on it.

Hello, my name is Brian and I'm a toolaholic
 
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