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  1. 24-07-2011 #8
    Jonathan's Avatar
    Lives in Leicester (Home) or Nottingham University (2nd Home), United Kingdom.
    Jonathan
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    You can control the speed of a modified servo ... just remove the potentiometer from the casing, make the wires a bit longer and that's your speed control. The closer you move the pot. to the position the servo is moving towards the slower it will go, and vice versa. Well, I think that will work ... never actually tried it.

    I think for this application you would be fine with the 'skate bearing' on aluminum angle method. Like this one:

    http://cr4.globalspec.com/PostImages...DAB26920C2.jpg

    It's not as strong, but will easily support a camera. I would use steel or aluminium tube for the rails. Preferably steel as aluminium will wear badly with steel bearings running on it.

    Controlling a stepper motor driver from a PIC is easy enough using the step and direction inputs. Just make it so that when you press a button it sends the right number of step pulses to move the required distance?
    Last edited by Jonathan; 24-07-2011 at 11:22 PM.
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