In the video titled “Why does wood get burn marks from a table saw?”, Steve Ramsey from Woodworking for Mere Mortals dives deep into the common frustrations woodworkers face when using a table saw. Burn marks can ruin a project, and understanding the causes can help prevent them.

The Frustration of Scorch Marks
One of the most annoying issues that can arise while cutting boards on a table saw is the appearance of burn or scorch marks. This problem can be intermittent, leaving many woodworkers scratching their heads: why does this happen, and more importantly, how can it be avoided?
Steve explains that excessive friction is the primary culprit behind wood scorching. This friction often comes from the saw blade spending too much time spinning against the wood, which can happen when the wood is fed through the blade too slowly.
Identifying the Problem
Understanding the right feed rate can be tricky, especially for beginners. It often relies on intuition and experience. Steve suggests that woodworkers should aim to maintain a steady feed rate. If scorch marks appear, try increasing the feed rate on the next cut and observe the results.
For longer boards, it can be challenging to keep the feed rate consistent. Steve recommends using two push blocks and alternating them to maintain a steady pace. Remember, it’s better to pause and reposition your hands than risk injury by forcing the wood through the saw.
The Role of Blade Sharpness
Another significant factor contributing to burn marks is a dull saw blade. A dull blade cannot cut through the wood as efficiently as a sharp one, which can lead to slower feed rates and increased friction. Steve shares that replacing a dull blade can make a world of difference, as it often rejuvenates the cutting experience.
Dirty blades can also be a problem. Over time, blades can accumulate tree resin and other gunk, especially when cutting softer woods like pine. Regular cleaning is essential, and Steve suggests various methods including using laundry detergent, vinegar, or commercial blade cleaners.
Understanding Blade Design
Steve points out that using a blade with too many teeth can also lead to issues. Fine-tooth blades may not have wide enough gullets to allow sawdust to escape, resulting in slower cuts and more friction. If burn marks continue to be a problem, it’s worth checking if the rip fence is parallel to the blade and ensuring that the blade aligns correctly with the miter slots.
Dealing with Burn Marks
Ultimately, burn marks can be annoying, but they don’t mean you have to scrap your cuts. Sanding the marks off or using a card scraper can help remove them. If the cuts are on parts that will be glued together or hidden, you might not need to worry about them at all.
Steve emphasizes that while it’s easier to reduce scorching in the first place, knowing how to deal with burn marks is just as important for any woodworker.