Grizzly G0716 owner manual Workpiece Inspection, Sandpaper, Selection, Grit Class Usage

Workpiece

Inspection

Some workpieces are not safe to sand or may require modification before they are safe to sand.

Before sanding, inspect all workpieces for the following:

•Material Type: This machine is intended for sanding natural and man-made wood prod- ucts. This machine is NOT designed to sand metal, glass, stone, tile, etc.; sanding these materials with a drum sander saw may lead to injury.

•Foreign Objects: Nails, staples, dirt, rocks and other foreign objects are often embed- ded in wood. While sanding, these objects can become dislodged and hit the operator, cause kickback, or damage the machine. Always visually inspect your workpiece for these items. If they can't be removed, DO NOT cut the workpiece.

•Large/Loose Knots: Loose knots can become dislodged during the sanding opera- tion. Large knots can cause kickback and machine damage. Choose workpieces that do not have large/loose knots.

•Wet or "Green" Stock: Sanding wood with a moisture content over 20% causes unnec- essary wear on the sandpaper and motors, increases the risk of kickback, and yields poor results.

•Excessive Warping: Workpieces with exces- sive cupping, bowing, or twisting are danger- ous to cut because they are unstable and often unpredictable when being cut. DO NOT use workpieces with these characteristics!

•Minor Warping: Workpieces with slight cup- ping can be safely supported if the cupped side is facing the conveyor belt. On the con- trary, a workpiece supported on the bowed side will rock during a cut and could cause kickback or severe injury.

Model G0716 (Mfg. Since 2/11)

Sandpaper

Selection

Sanding a workpiece smooth requires making progressively smaller scratches in the wood until they become too small to feel or be seen.

The abrasiveness of sandpaper is designated in grit size—the larger the number, the finer the abrasive and the smaller the scratches. Thus, 100 grit is finer than 60 grit.

Typically, sanding operations start with a coarse grit and progressively work through the finer (larger number) grits until the desired finish is achieved. Avoid skipping a grit to achieve the best results. Choosing which grit to start and finish with depends on many factors, such as the workpiece condition, type and hardness of wood, the desired finish, and others.

There are many types of sanding belts to choose from. We recommend Aluminum Oxide for gen- eral workshop environments. Below is a chart that groups abrasives into different classes and shows which grits fall into each class.

Grit	Class	Usage
36	Extra Coarse	Rough sawn boards,
		thickness	sanding,
		and glue removal.
60	Coarse	Thickness	sanding
		and glue removal.
80–100	Medium	Removing	planer
		marks and initial fin-
		ish sanding.
120–180	Fine	Finish sanding.

NOTICE

Sanding workpieces with high-resin con- tent or with applied finishes can quickly contaminate the sandpaper beyond the point where it can be properly cleaned. This will produce poor sanding results. In this case, use a different workpiece, remove the applied finishes, or frequently clean/ replace the sandpaper strip.

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