How do you represent Surface Finish on drawing?

Shaped Surface The trace left by a cutting instrument is parallel to the projection plane in the drawing. A surface roughness value, cut-off value or reference length, processing method, grain direction, surface undulation, etc. are indicated around the surface symbol as shown in Fig. 1 below.

How are surface textures shown on drawings?

Surface texture specifications are indicated using the root symbol. This root symbol is defined in the ISO 1302 standard (latest version published in 2002). The new ISO 21920-1 series will soon replace this standard with several changes that may modify common practices.

Which symbol is used to represent surface roughness on a drawing?

The surface roughness on a drawing is represented by inverted triangles. The basic symbol consists of two legs of unequal length inclined at approximately 60° to the line representing the considered surface.

What do Surface Finish symbols mean?

Surface roughness symbols are used to communicate the required surface texture of machined and structural parts and testing is done to ensure those requirement are met. Roughness includes the finest (shortest wavelength) irregularities of a surface.

What is the basic symbol of a machined surface?

This basic symbol consists of two legs of unequal length. These are inclined at approximately 60 degrees to the line representing the surface to be machined with the vertex touching it.

How are the symbols used in removal machining?

This is the direction of clear creases that are formed during removal machining. When pictorially representing the surface texture, the symbol that indicates the target surface is expressed with two lines having different lengths with an angle of 60° between them.

When to use roughness symbols on a drawing?

INDICATION OF ROUGHNESS SYMBOLS ON DRAWING In accordance with the general principles of dimensioning, the symbol is only used once for a given surface and, if possible, on the view which carries the dimension, defining the size or position of the surface. 21 INDICATION OF ROUGHNESS SYMBOLS ON DRAWING

When do you use symbols for surface texture?

Symbols that indicate the surface texture of machined and structural parts are used in industrial diagrams. The pictorial representation using these symbols is defined in ISO 1302:2002. This section will explain how to write these symbols to indicate surface textures.