ASME Y14.31-2008 pdf download

ASME Y14.31-2008 pdf download.Undimensioned Drawings.
1.7.2 Bend Radius bend radius: the inside radius of a formed part. 1.7.3 Bend Tangent Line bend tangent line: the line at which the flat surface of a part becomes tangent to the radius of the bend (see Fig. 2). 1.7.4 Brake Process brake process: a method of forming in which the punch is brought down on a flat pattern that is laid on the die, bending the sheet metal up and around the surface of the punch. 1.7.5 Center Line of Bend (CLB) center line ofbend (CLB): a line half the distance between the bend tangents that indicates the straight line of con- tact where the brake press bar will strike the flat pattern to form the bend (see Fig. 3). 1.7.6 Common Reference common reference: a reference line provided for use as a guide in coordinating the alignment of an item across multiple views or drawing sheets. 1.7.7 Comparator Drawing comparator drawing: a drawing defining a 2D true profile, used for overlay validation viewing of items with a comparator checking machine. 1.7.8 Contour Definition Drawing contour definition drawing: a drawing containing the mathematical, numeric, or graphic definition required to locate and define a contoured surface, also known as loft drawing. 1.7.9 Dimensional Accuracy Points dimensional accuracy points: a set of points located in a rectangular pattern to establish a means of measuring horizontally, vertically, or diagonally across the drawing to validate dimensional accuracy. 1.7.10 Flange flange: the portion of the item being bent. 1.7.11 Form Block Line (FBL) form blockline(FBL): the line representingthe intersection of the projected surfaces of the tool used for forming (see Fig. 4). 1.7.12 Grid Lines grid lines: a pattern of perpendicular lines drawn to a precise scale across the face of the drawing to validate dimensional accuracy. 2 1.7.13 Hydro Process hydro process: a method of forming in which the sheet metal is formed down over a die or form block by pres- sure applied through a rubber block affixed to the press ram. 1.7.14 Inside Mold Line (IML) inside mold line (IML): the line representing the intersec- tion of the projected inside surfaces of a formed item (see Fig. 2). 1.7.15 Joggle joggle: anoffsetdisplacementofmaterial fromits original plane or contour. Joggles are used to provide structural continuity between two adjacent surfaces. 1.7.16 Outside Mold Line (OML) outside mold line (OML): the line representing the pro- jected outside surfaces of a formed item (see Fig. 2). 1.7.17 Principal Plane principal plane: the flat surface of the item that flanges are developed from. 1.7.18 Printed Circuit Drawing printed circuit drawing: a drawing defining the circuitry pattern that is etched, deposited, screened, or bonded to a base material. 1.7.19 Registration Mark registration mark: a stylized pattern (symbol) that is used as a reference point for registration (IPC-T-50). 1.7.20 Reproduction reproduction: a copy that duplicates the original. Repro- ductions may be either reproducible or non- reproducible, depending on the media (MIL-PRF-5480). 1.7.21 Template template: a tool that is a dimensionally stable full size reproduction ofan undimensioned drawing that defines the profile of an item. 1.7.22 Tolerant Gage tolerant gage: accepts most part features that are within tolerance, rejects most part features not within tolerance, accepts a small percentage ofborderline out-of-tolerance features, and rejects a small percentage of borderline within-tolerance features (ASME Y14.43). 1.7.23 True Geometry Views true geometry views: views that show the actual shape description, and when it is a section view it shows the actual shape cut by the cutting plane (ASME Y14.3). 1.7.24 Undimensioned Drawing undimensioned drawing: a drawing which defines an item graphically, predominantly without the use of dimensions.
4 MEDIA The design tolerance requirements and the method of manufacture will generally be determining factors when selecting presentation media. Drawings that require strength, durability, and dimensional stability shall be prepared on Class 1 polyester film in accordance with L-P-519. Reproductions that require accuracy shall be prepared on Class 3 polyester film in accordance with MIL-PRF-5480. 4.1 Temperature and Humidity Accurate and stable undimensioned drawings shall be prepared and stored in an environmentally controlled area due to the effect of temperature and humidity on the media. The nominal value for temperature shall be 68°F (20°C) with a relative humidity of 50%. Compensa- tion must be made for measurements made at other temperatures and humidity to ensure integrity of the data presented.