1. Abrasives

3. Early kinds of abrasive Sand paper was first mass-produced in 1833.

4. Early kinds of abrasive Early sand paper used tiny glass shards bonded to paper.

5. Today’s common types of sand paper Garnet: common for wood working. Aluminum oxide: for wood or metal. Silicon carbide: wet or dry applications Garnet Aluminum oxide Silicon Carbide

6. Grit size The number on the back of the sand paper refers to the number of grains that fit in a square inch. CoarseSmooth 80 100 120 150 180 220 320

7. The larger the number the smaller the grit size. The smaller the number the larger the grit size.

8. Use coarse paper for rough sanding 80 to 100 grit For heavy sanding. To remove machine marks.

9. Use medium grit for final sanding of wood. 120, 150, 180 grit Breaking edges Removal of scratches

10. Use Fine grit for sanding between coats of finish. 220, 320 grit Sand lightly between coats of finish. Remove any rough areas of finish.

11. Types of sanders Portable belt sander. –For aggressive or rough sanding

12. Types of sanders Orbital sanders, ½ and ¼ sheet –For medium to fine sanding

13. Types of sanders Random orbit, Pneumatic and electric. –For swirl free sanding of wood.

14. Types of sanders Stationary Wide belt sander –For sanding machine marks out of surface of wood.

15. Types of sanders Stationary Edge belt sander –For straight edges of boards and radiuses. Use caution, this machine can remove material quickly

16. Types of sanders Stationary Disc Sander –For outside curves and short straight edges.

17. Types of sanders Stationary Oscillating spindle sander –For inside curves or radiuses.