Blocks used in technical furniture drawing can be divided into two types (BN-90/7140-03/02):
Fig. 5.3 Basic block: 1 edge of the sheet of paper, 2 cutting line to the dimensions of the basic sheet and 3 border
• basic blocks and
• assembly blocks.
The basic block (Fig. 5.3) should include in the drawings of the assemblages, subassemblages and elements, providing information that identifies the subject of the drawing and the constructor, and including at least:
• the name of the product, assemblage, subassemblage or element;
• the number of the drawing indicating the hierarchy of the object in the structure of the product;
• the name of the company;
• personal data of the persons responsible for the documentation, dates and signatures; and
• annotations about changes.
The reduced basic block is filled in, in accordance with the provisions (BN-90/7140-03/02). In the box “scale”, one main scale should be provided which is valid for a given sheet, especially where no scale has been indicated separately. The company name and name of the object should not be entered.
The assembly block is placed in assembly drawings. It consists of the basic block and list of parts (Fig. 5.4), which should include the following information:
• the number of the position of the marked part in the drawing;
• the name of the assemblage, subassemblage, element, fittings or connector;
Fig. 5.4 Assembly block: 1 edge of the sheet of paper, 2 cutting line to the dimensions of the basic sheetand 3 border
• the number of pieces of a given part in the product and subassemblage;
• type of material;
• number of drawing or norm.
The list of parts of the assembly drawing of the product should specify all assemblages, subassemblages and elements which do not constitute parts of the separate subassemblages. Subassemblages that make up the assemblage should be included in the list of parts of the assembly block of a drawing of a given subassemblage. It is recommended that on the list, the elements constituting the subassemblage or subassemblages constituting the assemblage are included in accordance with the expected technological process for this product. This is in order to locally, logically and technologically relate simple elements, fittings and accessories with elements that are more complex. All parts of the furniture piece must be entered in singular form regardless of the number of pieces in the product, assemblage or subassemblage. In the event of the repeated occurrence of two or more identical positions in a given column, characters of repeatability cannot be used.
In the production plant, each completed element, which the drawing documentation concerns, should have a specific drawing number, which should be written in the last column of the list of parts. For the remaining elements, the norm number or catalogue number should be provided. If the element has no counterpart in the norm number or catalogue symbol, then in the last box of the list there should be a dash. For elements of a circular cross section in the column “width”, before the diameter measurement, the symbol 0 should be written, while in the column “thickness”, there should be a short dash. In the case of connectors, it is permissible
For example, in the number 1748-01-02, the part 1748 means the type of product, the second 01 describes the assemblage, e. g. top surface, and the third part 02, the element in the assemblage 01—e. g. side-laminated board of the table’s top surface. If it is necessary to split some assemblages into subassemblages, and those into elements, then between the parts specifying the number of the assemblage and the element, an additional number of the subassemblage is inserted, e. g. 1803-01-02-03. This number describes an internal stile 03, an upholstery frame 02, a seat 01 and an armchair 1803 made using spring units 18. If the assemblage consists of individual parts aside from the subassemblages, then in the numbering of their drawings, the part of the subassemblage has the digits 00, e. g. 1803-01-00-03.
In digital letter numbering, the part specifying the product, and sometimes the assemblage, is replaced by letters, e. g. SZG25-W6-01, which could mean the board 01 of the top flange W6 of a wardrobe SZG of the subsequent number 25.
In the era of computer use as archival devices, it is more convenient to use digital numbering instead of mixed numbering. This simplifies sorting and searching archival collections, and provides clarity of the description of product groups.