Question
Download Solution PDFRoughness values (0.2 to 0.8) microns is indicated by which symbol
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
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.
The symbol must be represented by a thin line.
The value of roughness is added to the symbols.
1. Roughness ‘a’ obtained by any production process.
2. Roughness ‘a’ obtained by machining.
3. Roughness ‘a’ obtained without removal of material.
If it is necessary to impose maximum and minimum limits of surface roughness, both values are indicated. a1 = maximum limit, a2 = minimum limit.
|
Arithmetic mean roughness Ra |
0.025 |
0.05 |
0.1 |
0.2 |
0.4 |
0.8 |
1.6 |
3.2 |
6.3 |
12.5 |
25 |
50 |
100 |
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|
Former designation of surface roughness |
Max. Height Rmax. |
0.1 -S |
0.2 -S |
0.4 -S |
0.8 -S |
1.6 -S |
3.2 -S |
6.3 -S |
12.5 -S |
25 -S |
50 -S |
100 -S |
200 -S |
400 -S |
||
|
Standard values of standard length (mm) |
0.25 |
0.8 |
2.5 |
8 |
25 |
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|
Triangular indication |
∇∇∇∇ |
∇∇∇ |
∇∇ |
∇ |
- |
|||||||||||
So, Roughness values (0.2 to 0.8 ) microns are indicated by which symbol Three triangles.
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