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Determining rotational accuracy of a drive unit.

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nctnico:

--- Quote from: Puffie40 on May 21, 2021, 09:26:16 pm ---
--- Quote from: nctnico on May 21, 2021, 08:56:17 pm ---It could be the stepper motor has an internal reduction which then adds to the error as well.

--- End quote ---
No, the stepper motor has no other reduction- it is a direct drive.  It's full step size appears to be 1.8 degrees, since its lowest resolution is 200steps/rev.

--- End quote ---
But that is not what it says in your original post; there you start with a stepper which has 25000 steps/revolution and then goes through a 1:20 reduction.

james_s:

--- Quote from: nctnico on May 21, 2021, 11:39:30 pm ---But that is not what it says in your original post; there you start with a stepper which has 25000 steps/revolution and then goes through a 1:20 reduction.

--- End quote ---

The motor is direct drive with no integral gearbox, it drives a separate mechanism which results in a 1:20 reduction, at least that's how I read it.

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