I'm building a video camera pan and tilt head. Here's what I'm getting at:
I'll need one motor to control the horizontal rotation of the camera, and one for the vertical. The horizontal motor shouldn't meet much resistance, as I'll be using bearings to carry the weight.
The vertical motor on the other hand, will have to move the camera to a position and hold it there. The camera might be anything up to 5kgs. I'm designing it to obviously be as balanced as possible minimising strain on the motor, but there may still be a fair amount.
I'm using stepper motors because I need to be able to do repeatable movements, as well as extremely slow movements, e.g. move 2 steps, wait 10 seconds, move 2 steps again.
I've been looking at the SparkFun stepper motors, but I've been recommended Farnell and have been completely overwhelmed by choice.
So what kind of stepper motors would you recommend? I'd even been thinking of using two different types of motors, given the different stresses they'll be under. For instance, using this for pan and this for tilt. I'd tried calculating the holding torque from the 125 oz.in figure, but haven't come up with anything meaningful.
And finally, as I'm going to be controlling this from an Arduino, what is the best way to connect up the two stepper motors to the Arduino? The SparkFun stepper motor driver doesn't seem very cost-effective, given I'd be using two of them at $16 each. What would you recommend?
Just to be clear, I don't mean this to be a shopping-list type post. I'm asking whether the motors I mentioned are suitable or not, and if not what kind of things I should be looking for.