Iris - Educational model

My Educational Mechanical Examples SeriesThis model is one of my educational mechanical mechanism examples on 80mm x 80mm base plates.You can find all models of the series in this collection => [Mechanical Mechanism Examples] The present modelThis is an educational model of iris, where the thin blades open and close without changing the circular shape of the aperture. Brief DescriptionThe mechanical iris is used in compound camera lenses to adjust the brightness of the incoming light. In this model, each thin, triangular-shaped blade has a rotational pivot at one corner, and this pivot is fixed to the control ring. Each blade also has a pin near its outer edge, and the pin runs inside a slot on the other ring. When the two rings rotate relative to each other, the slot acts as a cam groove, causing the blade to rotate about its pivot—effectively swinging the blade in and out. Here, six blades are arranged evenly around the circumference. Their synchronized motion opens and closes the ap