Sandpaper should be used only after the edged tools have completely finished their work. Sandpaper is intended merely as a means of smoothing a surface, and any attempt to make it do the work of an edged tool will result in an unsatisfactory piece of work.
Fig. 93. Sandpapering Flat Surface.
Fig. 94. Sandpapering Curved Surface.
In sanding flat surfaces use a block, holding the paper with the fingers as indicated in Fig. 93, sanding along, not across, the grain of the wood. Curved surfaces will be sanded with the paper held free in the hand, as in Fig. 94.
On flat surfaces the arrises are kept sharp, unless upon the arm of a chair, or similar part, where the sharpness would cause injury or discomfort.
The relative fineness or coarseness of sandpaper can be told by the number stamped upon the back of each sheet. These numbers vary from 00 to 2, the former being quite fine and used for sanding shellac and other finishes. No. 1 is most commonly used in manual training work.
Fig. 95. Claw Hammer.
Never sandpaper the parts to a joint; the edged tools must be depended upon entirely for joint work.