How do I make a 1" x 1" 1/8" thick copper door go up and down?
I am making a sculpture that has a 2" o.d. copper tube running down the middle. At the bottom of the tube I need to have a small door about 1" x 1" that will raise and lower on the outside of the tube to let balls enter and fill the tube. Does anyone know how I can do this? What type of motor, etc to use. Thanks, Marc