Sand Paper Notes 1 What is sand paper

Sand Paper Notes 1

What is sand paper? Why do we need it? How do I know what kind to use? 2

Sand paper is a combination of 3 items? • A backing material - cloth or paper • An adhesive - Glue or epoxy • An abrasive material - natural or manmade 3

Sandpaper is some type of abrasive mounted on a piece of paper or cloth. It is measured in what is called grit 4

What is Grit? • Grit is the way sandpaper is measured. To determine grit it is measure buy the number of pieces in 1 square inch on the paper. • It is applied in 2 ways Gravity feed Electrostaticly 5

Ranges of Grit • The coarsest paper manufactured is • 16 Grit • it looks like Rocks on paper • Who would use it? • The finest paper manufactured is: • 2000 grit • This is hard to find paper, it feels like notebook paper • Who would use it? 6

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Grits in woodworking • In woodworking the grits usually range from 60 to 220. • We will use 4 different grits in our class • 60 - Coarse • 100 - Medium • 150 - Fine • 220 – Extra Fine 8

There are 4 main types sandpaper made • Garnet - Used in cabinet making, Natural Material, but Not a durable product • Aluminum Oxide - Used in cabinet making, it is a Manufactured product and is a very durable product 9

Continued…. . • Emery - Used in metal working with a cloth backing. It is very durable and can get wet. • Silicon Carbide Used in auto body work. It is known as Wet dry paper. It has a plastic coating so it can get wet 10

What will we be using in our classes? • We will be using Aluminum Oxide paper. It is a brown color. The darker the color, the coarser the grit generally. 11

How do we sand? • The only important thing to remember about sanding in one thing, the direction. 12

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Order for Sanding • 60 Grit. Start with this. This sand paper should be used to take out the saw marks, and shape your CO 2 car. Its not uncommon to spend 3 class periods using 60 grit sand paper. • 100 Grit. This will be the beginning of the finishing process. The 100 grit sand paper will take the scratches out from the 60 grit sand paper. 14

• 150 Grit. This should be used to create that smooth feel to your car. • Wet the wood. Use a wet paper towel to raise the grain of your wood. The wood is very soft and expand when wet. This step will allow you to achieve a better finish in your paint. Let the wood dry overnight. • 220 Grit. Now finish sanding your project with 220 grit sand paper. You will notice how smooth your car is! 15

Questions? 16