Here's an in-progress photo of the adapter being machined. At this point some dimensions have been laid out on the electric motor face. The holes for the four bolts that secure the motor to the adapter are already drilled. Also, you can see material has been removed along the profile revealing a 1" thick flange (the piece started out 2" thick).
In this next image, you can see the whole adapter (mounted to a rotary table) angled so that a conical taper can be machined from the 1" thick flange up to the face the motor will mount to. The entire aluminum piece gets rotated as the mill cutter turns in place.
The rotary table is a heavy duty piece of equipment. Also pictured in the photo below is a dial indicator used to ensure the part being machined on the mill is perfectly flat. It can measure extremely minute changes in height as the part is moved/rotated under it.
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