Karhennushöyliä

Karhennushöyliä, often translated as "roughening planes" or "carding planes," are a type of tool used in woodworking and craft. Their primary function is to create a textured or roughened surface on wood or other materials. This roughening can serve several purposes, such as preparing a surface for better adhesion of glue or paint, creating a decorative effect, or providing a grip.

These tools typically consist of a handle and a working head. The head features a series of sharp, often irregular, projections or teeth. These teeth are designed to tear or scrape away small fibers from the material's surface, rather than cutting a clean plane. The pattern and sharpness of these teeth can vary significantly, leading to different degrees and types of surface texture.

Karhennushöyliä are not as common as standard planes and are often found in specialized workshops or used by artisans. Their application is more about controlled abrasion than precise shaping. For instance, a woodworker might use a karhennushöylä to scuff up a smooth surface before applying a varnish, ensuring better bonding. In some textile crafts, similar tools might be used for carding fibers. The specific design and use are often dictated by the material being worked and the desired outcome.