SP09 stepper motor drive
Hi Steve, quick question, I see you are working on a motor drive for the ball clock SP17, do you think it would work on SP09 instead of using the CNC board etc.
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Printed Clocks
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The mechanisms are completely different.
The motor directly drives the hands on SP9, so the accuracy depends on the accuracy of the motor. It needs to be a motor with a precisely controlled speed. A stepper motor is the simplest solution. A DC motor would require an encoder with a feedback loop to set the speed.
The rolling ball clock uses a pendulum to set the rate. Any motor fast enough to keep lifting balls is sufficient. A simple DC motor will work. A stepper motor is more complex, but much quieter as shown in the video.