Back to it.  The lathe was a "necessary" distraction, but it took a few weeks away from the main event.  Now that it is running, or enough so to do work, this project can advance.

The tapers in the drive gears have been completed.  Measuring the motor shaft and doing a little trig, the taper angle was determined to be just about 6.97 degrees - we'll call it 7.  Still need to cut the  internal key slot, but I have to think about how I want to do that.

Two Gears, one on motor other on the shaft to show fit

The rest of the drivetrain also needs keyway slots, but they are easier.  Each wheel is driven by sprockets with 0.187" keys.  Each 0.75" axle was faced off in the lathe on one end, then set up in the mill to cut the slots.  I found an appropriate end mill, zeroed it to the top of the shaft, then set it to -0.098" a little more than half the key width accounting for radius of the shaft.  Total slot length needs to be about 4 inches, cut in one pass at slow feed rate - bingo - 5 more to go...

Facing

Milling

Final Product

The fit and centering is perfect ( if I don't just say so myself )

On to the rest of the shafts.

Next up is cutting them to final length, facing them off, and cross drilling for the wheel hubs.