How to grind with an orbital grinder? - Abrasives Safetyan orbital sander and grinder a random orbital sander a coated disc . Follow carefully the instructions given in the machine handbook. □ Ensure the disc is.orbital grinding machine,development of an orbital grinding machine for grinding large size .Feb 5, 2016 . Abstract- Orbital grinding is that a grinding wheel machines a workpiece moving a certain trajectory, and the grinding machine employing such.