Even more amazing: the first pinout arrangement turned the motor in the correct direction!
I’ve concluded that the MBI stepper motors aren’t appropriate for the Thing-O-Matic
This motor has six active terminals, so it could run in either unipolar or bipolar mode.
The TOM now traverses reliably up to about 90 mm/s.
The REF trimpot has no magic ability to force more current into the motor than Ohm’s Law will permit.
It’s time for some doodling on that subject
No wonder those poor things lose steps at the slightest provcation!