STATUS: DRAFT This standard defines a universal way to describe shapes. <> = Summary = This standard describes a way to specify basic shapes of sections, together with their dimensions. A code is a concatenation of data blocks: {{{ [Details block][Units block] }}} * Shape block: This is one character for the main shape * Abbreviations: H Hexagonal, C Circular, S Square, R Rectangular or... * Letters of letter shapes sections: I, U, L, T, O, Z (O is omega shape). Example: R for rectangular massive flat bars. * Details block: Zero or more characters with constraints of the shape. They are only added if required. Order is alphabetical. * E: Equal width and height and or equal legs. Examples: ZE for a Z profile with equal legs or TE for a T with equal width and height. * H: Hollow sections. Examples: SH for for a square hollow with sharp edges and CH for a circular hollow, pipe. * F: Flanges extra. Example: UF for a C like profile. * R: Round edges. Examples: SR for a square bar with rounded edges or SHR for a square hollow with rounded edges, square tube. * S: Flange has a slope: Example: IWS for an I profile with flanges with a slope. * (n)W: Wall endings diverge. Diverging thickness, width of one or more wall endings (i.e. are not parallel, ending in radius), typical for warm rolled products. If similar flanges end not straight a value between brackets is leading: 1 for one radius, 2 for two radii. If non similar flanges end not straight the sum is added. Examples: IW for an I profile with radii between flanges and web but with sharp flange endings, L1W for a L profile with each leg ending containing one rounding, L2W is similar but with each leg ending containing one rounding on each side of the flange ending, T3W for a T profile with horizontal flanges with one radius and the vertical flange with two radii. * X or Y: Section is cut over x- or y-axis. Example: IW cut over longitude becomes IWX. * Units block: Omitted or one character, no character means metric in mm and "I" means imperial in inches. * Geometry block: All dimensions needed to constrain a section * The logical order is: First order rule: width, then height, then thickness in same order, radii and angles. Second order rule: first horizontal, then vertical. For radii: First internal, then external, then flange endings. * Angles can be degrees or ratios like "7/50". * Dimensions are nominal. * See the table with drawings, where dimensions have an order number. * The list separator is an asterisk "*" The following table shows the implementation of what is above. {{attachment:dimensions_shapes.svg||width=750}} = Intend = The intend is to offer a way to classify industry standard profiles, not limited to steel, based on shape only. The reasons for using this standard can be: * Shapes are described not depending on manufacturing characteristics such as "warm rolling". * Shapes are described not depending on function characteristics such as "beam". * Shapes are described not depending on material characteristics such as "steel". * The names are better suited for use in automation applications. * Naming is based on visible appearance like "Square" and "Rounded", seeking a compromise between habitual naming, being practical and being complete enough to achieve global coverage. * By defining a shape, followed by parameters for geometry, a global unique designation is created. = Naming = A shape is defined by a concatenated string, consisting of two parts: * Shape defining parameters like R for Rectangular bar. * Geometry defining parameters 30*5 for width and height in mm. Following this example, the designation is: {{{ R30*5 }}} == String of shape defining parameters == The name is one or a combination of characters. * The first character is the main shape. Examples: "T-profile" and "Rectangular" * Subsequent characters are only designated if not corresponding to the expected default shape and or add extra shape complexity. This works like a sieve. The longer the code, the more complexity. === First character, main shape === The first character determines the basic shape. {{attachment:basic_profiles.svg|basic_profiles.svg|title=""}} The first row contains abbreviations: ||'''H''' ||Hexagonal || ||'''C''' ||Circular || ||'''S''' ||Square || ||'''R''' ||Rectangular || The second row is more obvious, the letter represents the shape. O stands for omega. === Following characters, additional shape characteristics === The sieve consist of characteristics that are additional to the main shape. So what is standard, what is expected is not specified. Deviations are marked with a character. From top to bottom: ||'''Char.''' ||'''Standard, to be expected''' ||'''Deviation''' ||'''Examples''' ||'''Remarks''' || ||'''E''' ||Width does not equal height and or not equal legs ||Equal width and height and or equal legs ||LE, TE, ZE ||For Squares and Rectangles an E is not applicable. For Z-profiles only equality of legs is meant. || ||'''F''' ||No extra flanges ||Extra flanges ||UF || || ||'''H''' ||Solid ||Hollow ||CH, RH ||CH is a pipe. || ||'''R''' ||Sharp edges ||Round edges ||LR, UR ||Typical products with one or more bending radii. || ||'''S''' ||Flanges without a slope ||One or more flanges have a slope ||ISW, USW ||Also typical for some warm rolled products. || ||'''(n)W''' ||Parallel wall endings ||Diverging wall endings ||IW, T3W ||This is typical for warm rolled and extruded products where internal radii change the thickness and or when flanges end in a radius instead of ending straight. A leading number represent the number of radii per flange type || ||'''X''' or '''Y''' ||Whole shape ||Shape is cut over length ||ISWX, UWY ||X is horizontal cutting, Y is vertical, based on orientation in the table with examples and dimensions and as discussed under "orientation". || ||'''I''' ||Metric dimensions in millimetres ||Imperial dimensions in inches ||RHRI, IWI ||If the last character of the shape defining string is I, then the parameters that follow are in inches. || == String of geometry defining parameters == === Orientation === Shapes are positioned as illustrated. The series H, C, S and R as drawn. The letter series as written. So a H-beam is a variant of the family of I-shapes and is drawn as an I. ||'''Abbr.''' ||'''Meaning''' || ||'''IP''' ||Insertion Point (most logical snap point for CAD) || ||'''W''' ||Width, a horizontal dimension. || ||'''H''' ||Height, a vertical dimension. || ||'''T''' ||Thickness of material. || ||'''R''' ||Radius. || ||'''A''' ||Angle in degrees ||