What does the spreader riving knife do on a table saw?
What does the spreader riving knife do on a table saw?
A riving knife is a flat piece of metal that is mounted just aft of the saw blade. When you push a workpiece through the saw blade, the riving knife is designed to keep the two cut sections of the board from closing up, thus pinching the saw blade and causing dangerous kickback.
Can you still get kickback with a riving knife?
Riving knives and splitters When it comes to preventing kickback, the best tool for the job is either a riving knife or a splitter. Each of these plates sits aft of the blade and, when properly aligned, as shown in Photo B, keeps the workpiece against the fence to deny it access to the rising rear saw teeth.
What’s the difference between a splitter and a riving knife?
Both sit behind the blade to prevent the two sides of a cut piece of wood from pinching or rotating into the blade. However, a splitter typically doesn’t change height, while a riving knife raises and lowers with the blade.
How thick should a riving knife be?
Most older factory supplied guards use 14 gauge and even less in some cases. Until recently, this was typical. Now with newer saw designs coming out that are equipped with riving knives, more and more are shipping with . 090 inch thick factory knives.
When did riving knives become standard?
You may have heard the news back in 2007 that riving knives, which help to prevent tablesaw kickback, were becoming a standard feature on all new models released by 2008.
What causes saw kickback?
Kickback is a situation when wood gets picked up by the blade and violently thrown at you, which happens way faster than you can react. This usually occurs when the workpiece pinches the blade or gets stuck between the blade and the rip fence.
Should riving knife be thicker than blade?
Richard Jones: The same thickness, or a tad more, as the blade plate, which is just a hair less than the saw kerf. Carol Reed: Riving knives are often tapered from front to back. The thickest part is slightly less than the thickness of your saw blade. In America, sheet metal splitters are the norm.
How do Riving knives work?
A riving knife is designed to move with the height of the blade and maintain a close clearance distance between the knife and the blade — a safer option. The Shark Guard Ark Shown in place. As you might imagine, to keep the distance equal with the blade requires some extra parts under the top.
What is a saw blade splitter and how does it work?
A splitter mounts behind the saw blade and essentially stay right there. While the blade moves up and down, the splitter remains in a constant location and the distance between the teeth of the blade band the splitter changes (below), widening when the blade is lower, and reducing the effectiveness of the splitter.
What happened to the Powermatic 66 table saw?
First, our Powermatic 66 table saw has been replaced with a newer model by the manufacturer, so we have used some aftermarket items to keep it safe and up to speed. One of these is the splitter shown above (made by Biesemeyer a number of years ago). But before I get too far I want to point out that this is a splitter, not a riving knife.
