Mechanical drawing symbols (manufacturing drawing symbols) are symbols used to represent specific designs in mechanical drawings. Common mechanical drawing symbols are:
Straightness (-) - It is an indicator that determine whether the line is straight or not comparedwith the ideal straight line.
Flatness – its Symbol is a parallelogram and it is an indicator that limits the amount of change between actual plane and ideal plane. It is for plane grievances and demands.
Roundness (0) -- is an indicator that limits the amount of change between actual circle and ideal circle. It is used for parts that have cylndrical surface (like circular conical surfaceand spherical surface) and a normal section that has circular profile (like plane that is perpendicular to the axis).
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