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Tolerancing |
TOLERANCING
All dimensions must have a tolerance. Nothing can be made to perfection, and an appropriate tolerance must be stated.
Tolerances are specified on a drawing for the allowable variations in size, form, orientation, and location of part features. Tolerances can be expressed as specified limits of tolerances shown directly on the drawing for a particular dimension, plus and minus tolerances (eg. ±0.5), tolerance notes (eg. 45g7), and tolerance symbols (Æ0.06). There are several different tolerancing methods, including limit dimensioning, plus and minus tolerancing, and general tolerance notes.
In limit dimensioning, the maximum limit is placed above the minimum limit. When it is expressed in a single line, the low limit come before the high limit and is separated by a dash. Also note that the limits should be expressed to the same number of decimal places.
Plus and minus tolerancing method specifies the size first and is followed by a plus or minus expression of tolerancing. The plus value is placed above the minus value. This type of tolerancing can be further categorized into bilateral and unilateral tolerancing. In bilateral tolerancing, the positive and negative tolerances are usually equal. Unilateral tolerancing is generally used for establishing the position of a feature, whenever the ideal position of a feature is midway in the acceptable range of tolerance.
General tolerance notes is used to specify the tolerance of an object as a whole, instead on every dimension.
As have mentioned earlier, nothing can be made to perfection, even if a drawing is made with high-precision measuring tools, and the object that I have drawn is not perfect either. Therefore, tolerance has to be made in my drawing to display variations in dimensions.
Reference
[1] Campbell, Robert G., “Tolerancing,” Integrated product design and manufacturing using geometric dimensioning and tolerancing. New York : Marcel Dekker, 2002.
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