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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