Air orbital sander air grinder weight 203 kg power supply compressed air operation idle speed max 8 000 rpm function grinding sanding surface 170 x 92 mm orbital air sander operating air pressure 90 psi62 bar air consumption 142 lmin no load speed 8000 rpm sanding surface 170 x 92 mm weight 203 kg air pressure 6 2 bar air consumption 142 l min