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Ideas about connecting servo to threaded rod.

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The servo to threaded rod disk may make it easy to have a sensor to detect each revolution. Either a bump on the disk to trip a micro-switch on a 'tab' to block a photo-detector.
Then at least you can count to turns on each threaded rod. With some code (micro-controller) you could get the faster servos to wait for the slower servos on each revolution. This way the maximum tilt error can only be one thread pitch.
Of course you could have multiple 'tabs' to increase the resolution.

Wait - let me make sure I have this right.

You started with servos that have built in position sensors.

You disabled the position sensors.

Now you need to measure the position of the servos.

(Yes, I understand why you did it that way - but when you think about it, it is kind of funny - eh?)

You can get continuous rotation potentiometers - you would have to keep track of the number of turns and make sure you start out level, and you would have to deal with the glitch in the output every time the pots "roll over" but it would be a low cost solution with reasonable resolution that would work at reasonably slow speeds.

Or use stepper motors.


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