“Scope creep” is often derided as an obstacle between your idea and the delivery of a finished project. That may be, but sometimes the creep is the whole point. It’s how we end up with wonderful builds like this multi-axis differential camera slider.
We mention scope creep because that’s what [Jan Derogee] blames for this slider’s protracted development time, as well as its final form. The design is a bit unconventional in that it not only dollies the camera left and right but also works in pan and tilt axes, and it does this without putting any motors on the carriage. Instead, the motors, which are located near the end of the slider rails, transmit power to the carriage via loops of 217timing belt. It’s a little like the CoreXY mechanism; rotating the motors in the same direction and speed slides the carriage, while moving them in opposite directions pans the camera. A Sparkfun Pro Micro in the controller coordinates the motors for smooth multi-axis motion, and the three steppers — there’s a separate motor for the tilt axis — sound really cool all working at the same time. Check out the video below for the full story.