29 Aug '16, 5pm

How Accurate Is Microstepping Really?

Very good write up & testing! Another thing to consider though are the other limitations imposed beyond the electrical ones. Manufacturers also typically list the mechanical accuracy of the stepper motor in the datasheet. This is usually based upon the accuracy of the mechanical assembly as opposed to the electrical theoretical accuracy (detent torque vs holding torque as given above). Most stepper motors I’ve seen (usually for CNC applications) don’t have a mechanical assembly accuracy of greater than 5% per step (or about ±0.09° for a typical 200 step per revolution motor). So basically the mechanical degree variation within a full step varies from 1.71°-1.89°. Any electrical accuracy claimed beyond this limit becomes superficial as your mechanical error is greater than what you could electrically provide. If a driver is providing accurate and smooth 256 micro-steps per ...

Full article: http://hackaday.com/2016/08/29/how-accurate-is-microstepp...

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