Instantaneous Center of Rotation

The Instantaneous Center of Rotation (ICR) is a point in a moving object or mechanism that appears to be stationary at a specific moment. Imagine spinning or moving parts: at any instant, certain points seem to stay still while others move. The ICR is that unique point—the pivot around which the parts appear to rotate at that exact instant. It helps engineers analyze and understand the motion of complex mechanisms by simplifying their movement to a rotation around this single point, making calculations and design more intuitive.