•Modern continuous hot-strip and cold rolling mills operated under automatic control provide high throughputand production rate.•Of all the metal working processes, rolling is the best suited for the adoption of automatic control because it is an essentially steady-state processin which the tooling geometry (roll gap) may be changed readily during the process.•Automatic control in rolling such as the development of online sensors to continuously measure sheet thickness. The most widely used instruments are 1) flying micrometer 2) x-rayor isotope, gauges which measure thickness by monitoring the amount of radiation transmitted through the sheet.•More recently control procedures have been aimed at controllingstrip shapeas well as thickness.
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