Wednesday, April 7, 2010

Engineering Symbols

Tolerance: Total amount a dimension can very and is the difference between max and min value. Tolerance may be specifies as a factor or percentage of a value.

Datum: A datum is theroretically the exact point, axis or plane.

Allowance: A planned deviation between and actual dimension and a nominal or theorectical dimensions , or between and intermediate-stage dimension and intended final dimensions.

Geometric Tolerancing: This a sumpolic language used on engineering drawings and computer generated 3D solid models.

The Welding Symbol: The horizontal line is called the reference line, this is the anchor to which all the other welding symbols are tied.Weld instructions are written along the reference line.

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