I just tried turning the energized stepper with the encoder attached to it. I used a long pair of pliers this time so I have a lot of leverage and can easily feel the amount of resistance I get from the stepper. While turning and feeling the resistance, I looked at the encoder angle.
Basically, everything you guys said is true:
- To go from A to another A, you need to jump 4 whole steps: confirmed!
- It jumps in increments of 7.2 degrees: confirmed!
- You should be able to deflect the motor by a maximum of 3.6 degrees and have it return to the correct position: confirmed!
- The resistance to torque increases until 1.8 degrees and then decreases between 1.8 and 3.6: confirmed!
- In the range between 1.8 and 3.6 it still wants to return to the original position but it gets weaker: confirmed!
- Beyond 3.6 degrees the resistance is “negative” meaning it jumps forward to the next step: confirmed!
- If you apply a constant force and keep increasing it, 1.8 degrees corresponds to the maximum holding torque and that’s where it yields: confirmed!