What does the given symbol represent?

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  1. Any machining method may be used
  2. Material removal not permitted
  3. Material removal by machining is required
  4. Material addition is required

Answer (Detailed Solution Below)

Option 2 : Material removal not permitted

Detailed Solution

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Explanation:-

The surface roughness on a drawing is represented by triangles.

Surface texture or roughness representation

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.

RRB JE ME 57 15Q Metrology CH 1 Hindi - Final Diag(Deepak) images Q7

The value of roughness is added to the symbols.

RRB JE ME 57 15Q Metrology CH 1 Hindi - Final Diag(Deepak) images Q7a

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

RRB JE ME 57 15Q Metrology CH 1 Hindi - Final Diag(Deepak) images Q7b

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