Disc sander

This is the most popular sander. It is a powerful machine with a hard rubber flexible pad on to which the actual sanding disc is fastened by means of a centre nut. This nut is threaded in such a waythat it tightens as the machine rotates,thus avoiding the risk of a disc coming loose. Disc sanders are driven either electrically (Figure 3.55) or by compressed air (Figure 3.56).
The main uses of the disc sander in the repair shop are sanding sections on panels which are either rusted or have been repaired by planishing and require sanding to a smooth finish in readiness for painting; cleaning sections that need to be filled with solder prior to tinning; stripping paint prior toplan- ishing or dressing out; dressing off surplus weld metal after welding new sections; feather edging minor paint blemishes; and blending in body solder or plastic filler in sections that have been filled.