Servo Vs Stepper

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Trying to decide between servo and stepper.

The application involves swinging an 18" bar up to 90 degrees.

The torque needed would be around 600 oz-in.

It would need to make the 90 degree turn in less than 0.2s (75 RPM), so would need high acceleration right off the start, but wouldn’t need a fast top speed.

Doesn’t need to be precise, but needs a quick, snappy, “flicking” motion of the bar, in both directions with fast reflexes if that makes sense.

Any info helps, thanks.

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Could you please show a picture or link of the bar that you’ll be using?

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Still in the design phase so unfortunately not, but think of it like a rod with a point mass at the end with a moment of inertia approx. 0.125 kg m^2

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Hi @nickweisberg and welcome to the forum.

Maybe these short tutorials can help you choose?

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In general, for fast movement, servo is the best choice. For slow and precise angular movement, stepper is better. Here are some applications of servo motors: Control Engineering: Surprising Applications of Servo Motors - The Engineering Projects

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