The space which can be swept by the wrist reference point added by the range of rotation or translation of each joint in the wrist (secondary axes). (ISO 8373)
Pinnacle Systems, Inc. (Safety Sensors and Controls for Industrial Machine Guarding Systems), Safety Glossary, Pittsburgh, Pennsylvania, USA 2014. http://www.pinnaclesystems.com/Glossary-B-I.html, (Ergo - Amer) {759}