Freud® LM74R 10" Glue Line Rip Blade
Glue up boards straight off the table saw! Traditional rip blades are made to do one task — cut boards quickly. But the price you pay for speed is a coarse edge that needs jointing or sanding to remove blade marks. A Glue Line rip blade solves the problem by slightly bumping up the number of teeth per blade (from 24 to 30) and changing the shape of those teeth for better cutting action.

Freud 10'' Glue Line Rip Blade LM74R

This blade quickly cuts stock to width without leaving blade marks and means you can glue up boards without extra cleanup steps. Traditional rip blades are made to do one task — cut boards to width quickly. But the price you pay for speed is a less-than-smooth cut. Which means you have to clean up the edge. That extra step doesn’t seem worth the time saved using a rip blade.

The reason a traditional rip blade can cut so fast is that it has fewer teeth — most have 24 teeth. Since each tooth ends up taking a bigger bite, the blade can chew its way through a board quickly. The trade off is that taking a bigger bite results in a coarsely cut edge. I found a solution to my ripping troubles in a relatively new type of blade. It’s called a glue line rip blade because the manufacturers claim you can glue up boards straight off the table saw, without jointing or sanding away blade marks. A glue line rip blade solves the quality-of-cut problem without losing the advantage of high cutting speed. And the secret to how it does this lies in the teeth. Perhaps the easiest way to get a smoother cut is to increase the number of teeth on the blade. But the more teeth that are put on the blade, the slower it will cut. Glue line rip blades strike a balance by only adding a few more teeth — increasing the tooth count from 24 to 30. That step alone will make some difference in quality. But the rest of the improvement comes from the tooth geometry.

If you look closely at a traditional rip blade, you’ll see that it has a single type of tooth— with a flat-topped shape. In comparison, a glue line rip blade combines a flat-top tooth with either an alternating top bevel tooth or a triple chip tooth. The result is you have two different cutting actions going on at the same time. The shaped teeth remove most, but not all of the waste in the kerf. The flat teeth then follow to cleanout the rest of the waste and square up the corners of the cut. It’s not only the way each tooth is ground that affects the quality and speed of the cut.

The hook angle of the tooth is important, too. The hook angle is how far the tooth leans into the cut — the higher the angle, the more aggressive the cut. (The hook angle on most table saw blades ranges from 10° to 20°.) Since adding teeth slows down the cutting speed, some of the glue line rip blades increase the hook angle to make up for it. While some had an average 12° hook, one blade had a hook angle as high as 22°.Blade Plate.

There’s more to a table saw blade than just the teeth, though. Even the plate the teeth are attached to plays a role in making it a smooth operator. Like most modern table saw blades, glue line rip blades have a few high-tech features to keep the blade running straight and true. In the lower photo on the opposite page, you’ll see expansion slots and laser-cut vibration channels. These allow the blade to expand and contract during use without deforming or twisting out of alignment. Besides these basic additions, glue line rip blades can incorporate another feature — thicker plates. With fewer teeth taking bigger bites, there’s more stress placed on each tooth. So a thicker blade plate adds rigidity and helps stabilize the blade. A thicker plate has an added benefit. It provides more mass to help the spinning saw blade power through tough hardwood.