www.fitscoindustries.com shows how brass threaded inserts are installed into a plastic moulding using heat.
This is an animation created by Google SketchUp. It illustrates a simplified process of casting a reinforced concrete pad footing.
For more info and the 3D model of this animation, visit
https://cgetechnology.blogspot.com/2011/10/sketchup-animation-casting-of-rc-pad.html