Saw blade burns create unsightly marks on your carpentry projects and can be a real hassle to remove. Although they you can get rid of them with a little elbow grease, prevention is always best. Checking your saw and making a few simple adjustments can make saw blade burns less likely to occur.
The first step is to make sure your saw is sharp. A dull tool generates heat, making a burn more probable. Dull blades should either be sharpened or replaced. Also, check that the blade is not bent or warped, which will not only increase the likelihood of burns but may also make the saw kickback prone. A bent blade is non-salvageable, and should be replaced immediately.
A fairly obvious blunder is using the wrong blade for the cut. To prevent burns, make sure the blade you are using matches the cut you are trying to make.
The alignment of your saw can also be a source of burns. First, check the alignment of your blade and make sure it is parallel to the fence and aligned with the miter slot. Next, check the splitter, which should be aligned with the blade and parallel to the fence. The splitter is important because it separates the blade from the wood, and if it is malfunctioning or missing burns are far more likely.
The height of the blade can also effect saw blade burns, as a blade that is too low will create excess heat and friction.
Arbor flange run out can also cause saw blade burns. Although it can be laborious to fix, there are tutorials online about how to repair this yourself.
Another common problem is having a slow or uneven feed rate. This can cause friction, heat and burns.
The type and quality of wood may also be more or less inclined to saw burns. For example, warped wood or improperly dried lumber can release residue that causes burns. Also, specific types of wood are more susceptible to saw blade burns, including cherry, mahogany, maple and purple heart.
You'll want to do what you can to prevent saw blade burns, but if one does occur then sanding or applying a sharp, flat scraper can remove it.
If you are having repeated trouble with saw blade burns, you should check your saw for the above problems associated with burns. The most common causes of saw blade burns are poor quality tools, misalignment of saw parts, and difficult wood types, as well as novice cutting mistakes.