This document summarizes the mechanics of electron-positron pair creation according to the 3-spaces model. It describes two processes: 1) When a photon with energy over 1.022 MeV grazes an atomic nucleus, its half-photons can miss rejoining at the junction and go into an elliptical orbit, drawing energy from the photon's normal space kinetic energy and slowing it down. 2) When the half-photons reach the speed of light in their orbit, they decouple and separate into the electron and positron according to Newton's first law of inertia. Experimental evidence supports a threshold of 1.022 MeV for photon-induced pair creation.