Abstract: An assembly for mounting an abrasive sheet on a rotary abrading tool having a circular mounting member fastenable to the tool drive shaft and having an opposite surface bearing a typically square raised backup pad to which a square sheet of abrasive material can be fastened. Other straight edged backup pad configurations can be used if desired. Entrance holes are formed through the mounting member adjacent to the backup pad. A circular shroud is provided on the mounting member surface opposite the backup pad covering the exit holes. Air and dust are evacuated from said shroud and holes with a vacuum or built-in impeller evacuation system. The shroud has a diameter less than that of the mounting member and may have an edge engaging a circular groove in the mounting member to minimize air leakage between shroud and mounting member. The back up pad may be a reversible, double sided pad snapped into a mounting member recess. Additional dust evacuation holes and grooves may be formed in the backup pad itself.

Abstract: A system for removing dust generated by rotary hand tools such as grinders and sanders. A shroud is installed over the grinding or sanding head in communication with a vacuum exhaust system to draw away dust, chips and the like. The shroud includes a generally circular base having a peripheral skirt on one side to surround the grinding or sanding disc and a collar arrangement on the other for attachment to a cylindrical tool housing. The collar may be an axial partial tube section that is clamped to the housing. Collar flexibility allows use with housings over a range of housing diameters. Alternatively, the collar may be one or more brackets slidably mounted on the base. The brackets are adjusted to contact the housing and are clamped to the housing and, if necessary, are fastened to the base. Removable and adjustable exhaust tubes are provided to accommodate different desired vacuum hose directions and different vacuum hose diameters.