sisäänottoa

Sisäänotto is a Finnish term describing the process of creating an internal notch, groove, or recess in a workpiece to accommodate another component. The concept is used across several crafts, including carpentry, metalworking and manufacturing, wherever a part must fit into or mate with another part inside the geometry of a piece.

In carpentry and joinery, sisäänotto often refers to the creation of a mortise-like recess that accepts a tenon or dowel, forming joints such as mortise-and-tenon. In metalworking and machining, it describes internal grooves or keyways that align and secure components like shafts, gears or fasteners. The operation is defined by depth, width and length, with tolerances tailored to the required fit and the geometry of the mating part.

Common methods range from manual techniques, such as chiseling and routing, to powered approaches using mortisers, milling machines or CNC tooling for precise, repeatable results. Finishing steps may include cleaning the walls, deburring edges, and achieving the desired surface finish and alignment.

Key considerations include avoiding tear-out, maintaining straight and square walls, and ensuring a proper seating of the counterpart piece. In traditional Finnish carpentry, sisäänotto is a foundational technique for durable timber joints, while in modern manufacturing it is frequently implemented with computer-controlled tools to ensure consistency and accuracy.

Etymology: derived from sisä meaning inside and notto meaning notch or cut. See also mortise and tenon, dado, groove, keyway.