259 M 3.2 3.2 6.3 1.6 6.3 1.6 25 6.3 25 25 6.3 25 Milled 1. Positions of Auxiliary Symbols for Surface Symbol A surface roughness value, cut-off value or reference length, machining method, grain direction, surface undulation, etc. are indicated with the surface symbol as shown in Fig. 1 below. Fig. 1 Positions of Auxiliary Symbols a : Ra Value b : Machining Method c : Cut-Off Value, Evaluation Length c' : Reference Length, Evaluation Length d : Grain Direction f : Parameter other than Ra (tp:Parameter/Cut-Off Level) g : Surface Undulation (JIS B 0610) Reference These symbols except a and f are provided when they are needed. Reference Under ISO 1302, a finish range should be indicated as e in Fig. 1. Q Examples of Graphical Representation of Surface Texture Surface Symbol Removal of Material by Machining is required Removal of Material is Prohibited Upper Limit of Ra (a) (b) (c) Grain Direction Upper and Lower Limits of Ra (a) (b) Machining Method (a) (b) a c g d b f c' e d g e Code Meaning Illustration The trace left by a cutting tool is parallel to the projection plane in the drawing. Ex. Shaped Surface The trace left by a cutting tool is perpendicular to the projection plane in the drawing. Ex. Shaped Surface(Side View) Circular Cut, Cylindrical Cut The pattern left by a cutting tool diagonally crosses the projection plane in the drawing. Ex. Honed Surface The pattern left by a cutting tool crosses in various directions or has no grain direction. Ex. Lapped Surface, Superfinished Surface and Surface Finished with a Front Mill or End Mill The pattern left by a cutting tool is virtually concentric around the center of the plane in the drawing. Ex. Faced Surface The pattern left by a cutting tool is virtually radial around the center of the plane in the drawing. Trace Left by a Cutting Tool Trace Left by a Cutting Tool Trace Left by a Cutting Tool GeneralTechnical Information Drawing Indications of SurfaceTexture
RkJQdWJsaXNoZXIy MTc2MTk0OA==