`3/8 inch rebar rolling mill productivity case`

Rolling at half speed but four strands at once doubles productivity. Brief callback from prior lecture.

There's been a competition — I talked about plastic water bottles and aluminum cans. Well, there's a competition between steel and concrete. Concrete still has steel in it. [Tom passes a galvanized reinforcing bar.] Here's a reinforcing bar if you want to pass it around — it's galvanized. We talked about reinforcing bar, and how they were going slower to roll four times as much: if you went half the speed but rolled four strands rather than one, then you just doubled your productivity on the rolling mill.