I stumbled across a set of videos showing the details of sand casting methods used to produce the cast ductile and grey iron street light poles, utility boxes, and luminaries used by many municipalities across the country and inernationally. There were several points of interest for me: 1). Loose pattern pieces and their application was demonstrated. 2) The application of chaplets was shown. 3). Swing grinding castings was demonstrated 4). Simultaneous pouring from dual gates into the same mold is used. 5). Roll forming of steel tubes was shown. One safety point of interest struck me. In several instances there were closely spaced groups of raw or finished 15 foot tall castings standing on narrow unsecured side by side. If there were an earth quake or if a fork lift operator bumped one of those castings, there would be a whole lot of metal flying around.