Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: Marauder_Pilot on January 23, 2008, 11:23:56 AM
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One of my current projects needs a stepper motor that can rotate a roughly 6-8 pound (Still not 100% sure, so say 8 pound to be sure) aluminum container to a fairly precise degree. How powerful a stepper motor will I need to be able to control something like this?
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Where on the aluminium container is the axis of rotation?
Could you please tell us a bit more about your problem. The shape of the container, desired speed of rotation, accuracy.
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Centered. The project in question is going to be an air cannon with a revolver-style drum. With each shot, the drum will rotate and bring up the next chamber (Filled with a nerf rocket or a paint grenade or a length of rope or whatever else I need/want to propel faster then I can throw). Speed, I'd like to be able to have them rotate in at most a second. Accuracy needs to be within a few degrees-whatever is in the chamber won't have to line up *perfectly* with the barrel every time, but the closer the better. (However, they'll likely be somewhat loose in the barrel, and probably with a degree of squishyness or in a sabot that will let them pass through minute differences in alignment between the barrel and the chamber).
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What you need to calculate is rotational torque, based on mass and moment of inertia.
You can find equations in google/wikipedia.
If you get stuck, post what you got and we can help you from there . . .