Machining Surface Symbols On Drawings
If only one surface requires a specific surface roughness finish then it should be annotated on the drawing and not on the notes.
Machining surface symbols on drawings. To improve clarification of how surface texture is specified on technical drawings the international standard iso 1302 1999 has been produced. Surface texture symbols y14 38 2007. The principal iso standard that specifies syrface roughness is iso 1302 and defines the surface roughness symbology and additional requirements for engineering drawings.
Plated milled cold drawn. Structural steel profiles are not drawn in most cases nor are welds drawn or sketched as shown on the next page. Digital product definition data practices y14 42 2002.
Three basic graphical symbols are used with complementary information to indicate surface texture requirements. Abbreviations and acronyms for use on drawings and related documents y14 4m 1989. Digital approval systems y14 5 2009.
The symbols to indicate the information in connection with surface roughness are represented by symbolically. Understanding surface roughness symbols. Structural steel profiles and welding symbols the purpose of this page is to introduce you to some other symbols and abbreviations that are quite common on engineering drawings.
The surface lay and the lay direction produced by the machining process. This basic symbol consists of two legs of unequal length. This is the important characteristics for surface finish.
The quality of a surface finish on a metal surface produced by production method other than machining is shown on the drawing by a tick symbol as shown in fig a. The pictorial representation using these symbols is defined in iso 1302 2002. These are only a few of the total number of symbol and abbreviations available in each area.
Definition of surface finish. The standard surface roughness of the parts machined on 3d hubs is ra 3 2 μm 125 μinch. This section will explain how to write these symbols to indicate surface textures.
Before we get on with surface finish symbols let s understand how surface finish is defined. Dimensioning and tolerancing y14 5 1m 1994. Symbols for indicating surface finish.
Symbols that indicate the surface texture of machined and structural parts are used in industrial diagrams. Grades of surface roughness. Engineering prints call out a great many things in their attempt to make sure the part that gets made matches the designer s intent.
Complete guide to surface finish symbols charts ra rz measurements and callouts. Surface roughness symbol is given to convey manufacturing process related information only. Symbols of surface finish which are providing at the finishing stage which gives value of surface finish.
Unless written specifically on the symbol they do not carry the surface texture type i e.
