A push block is useful and safe when thin or narrow stock is being __________.

A push block is a useful tool primarily when cutting materials, especially thin or narrow stock, on a table saw. In this context, a push block helps to maintain control over the material while also keeping hands at a safe distance from the blade, preventing potential accidents or injuries.

When operating a table saw, the risk of kickback or the material binding can be heightened with thin or narrow pieces. The push block allows the user to apply downward and forward pressure, ensuring a straight and safe cut while eliminating the need to place hands too close to the blades.

In other situations, like cutting on a band saw or using a router, the risk dynamics and operational techniques differ. A band saw typically features a more controlled cutting environment that trims thicker materials, while routers are often used for edge trimming or shaping rather than making long cuts through narrow stock. Thus, the advantages of using a push block are most pronounced when working with a table saw.