Abstract: A mold and a process for non-manually cleaning the undercut along the bottom edge of the division plate which with a pallet under the mold defines a lip-forming subcavity results in a dry cast concrete block with an inside lip radius that is controlled to be within certain tolerances. Non-manually cleaning the undercut during the molding process can include spraying a jet of fluid, such as compressed air, at the undercut.

Abstract: Concrete wall blocks are described with features facilitating use of the wall blocks to construct each of: a wall section with set back; and, a vertical wall without set back. Wall blocks, kits or sets of wall blocks, and wall sections with various sized blocks are described. Further methods of assembly and use are described. Also, features selectively usable in various types of wall blocks are described.

Abstract: The invention relates to a method of controlling the quality of blocks that are produced front face-up in a mold, and verifying the accuracy of the production of such blocks, to ensure that the blocks are manufactured with consistent quality and minimal block-to-block variability. Measurement locations are formed on the front faces of predetermined blocks. By measuring the distances between the measurement locations and the rear faces and comparing with a target distance, any variation provides an indication that the blocks are not being properly formed. The process variables, such as the alignment of the compression head and/or the pressure plates to the mold, can then be adjusted accordingly.