Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: SupremeRulerG on May 07, 2006, 07:48:32 AM
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hi, I'm doing my thesis right now, and one of the requirements is to move a camera very precisely, down to the very last .07 degrees!!! yep! that's right --.07degrees thats two decimal places :o
Can someone suggest what motor I should use? servo or stepper? I'm currently considering using a stepper motor which has 1.8 deg per step, then, I'll just use gears to reduce the movement upto .07 deg. But is that possible?
can I really control it that precisely with a stepper motor?
lastly, can a servo motor be controlled to stop at a very precise position like for example...120.07 degrees?
thanks for reading my topic ;D
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Servos have an accuracy of about one or two degrees.
As for steppers, accuracy varies widely. You probably wont be able to find one any more accurate than a servo.
I think to have two decimal placess accuracy however is very unreasonable for a camera. Cameras are very good for robots, you shouldnt need accuracy like that . . . I think you should find another way to solve your sensing problem.
Why do you need such high accuracy?
Your only solution is a highly geared down stepper motor, cant think of anything else. Probably use a planetary or worm gear.
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Hi,
I don't know the topic of your research so I can't give you an specific answer. But you sould look for astro navigation telescope motor if you want a high precision. Or you could build something like this: http://www.mistisoftware.com/astronomy/Equipment_Drives.htm
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why dont you just use a servo with a large gear that is indexed to the precision that you need then just use an encoder to count the clicks you need for a specific degree http://www.societyofrobots.com/sensors_encoder.shtml (http://www.societyofrobots.com/sensors_encoder.shtml)