An opening or channel cut into the surface of a piece of a machine able material generally wood is called a dado. A dado has three sides when it is viewed in cross-section. A dado is perpendicular or cut across the granule and is therefore differentiated from a channel which is cut in the line or parallel to the grain. A dado passes or may be through all the way through the surface and its ends are usually open unless not stopped. They may be stopped at times, i.e. Both the ends finish before the dado meets the edge of the surface. Dadoes have many uses in day to day life. They are used to fix shelves to a bookcase or carcasses maybe. Together with a rabbet, on an adjoining piece, they are used to make what is called a rebate and a dado joint, which is sometimes used in case goods.
