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Size dimensions. Size dimensions indicate the size of basic shapes like arcs, prisms, cylinders, and holes. A circular arc is dimensioned by its radius using the symbol “R”. The arrow and leader should be placed to avoid clutter and overlaps. A cylinder is dimensioned in side view using linear dimensions for both the length and diameter.
- 6 Dimensioning
In either case, the dimension line which is closest to the...
- 6 Dimensioning
- Dimension Elements
- Arrowless Dimensioning
- Group Dimensions
- Stagger Dimensions
- Location and Orientation Dimensions
- Angular Units
- Detail Dimensioning
- Dimensioning Repetitive Features
Dimensioning a drawing also identifies the tolerance(or accuracy) required for each dimension. 1. Dimension — the numerical value that defines the size, shape, location, surface texture, or geometric characteristic of a feature. 2. Basic dimension — a numerical value defining the theoretically exact size, location, or orientation relative to a coor...
To avoid having many dimensions extending away from the part, arrowless dimensioning may be used. 1. the “zero” lines represent the vertical and horizontal datum lines, 2. each of the dimensions shown without arrowheads indicates the distance from the zero line. 1. There shall never be more than one zero line in each direction. 2. Arrowless dimensi...
In standard practice, dimensions are grouped on a drawing for uniform appearance. Avoid using object lines as extension lines for a dimension. Dimensions must be kept outside the boundaries of views, wherever practical. Dimensions can be placed in series and parallel. 1. When a series of dimensions is applied on a point-to-point basis, it is referr...
The general practice is to stagger the dimension text on several parallel dimensions. 1. Horizontal — the left-to-right distance relative to the drawing sheet. Here the width is the only horizontal size dimension. 2. Vertical — the up and down distance relative to the drawing sheet. Here the height and the depth are both vertical dimensions, even t...
The dimensions can be classified by type of location or orientation: 1. Horizontal position – locates the position of the feature in horizontal direction with respect to a base; 2. Vertical position – locates the position of the feature in vertical direction with respect to a base; 3. Angle – gives the angle between the horizontal plane and the slo...
Angular dimensions are shown either in decimal degrees or in degrees, minutes, and seconds.Where only minutes and seconds are specified, the number of minutes or seconds are preceded by the 00.Holesare typically dimensioned in a view which best describes the shape of the hole. Diameters must be dimensioned with the diameter symbol preceding the numerical value. When holes are dimensioned...
Repetitive features and dimensions may be specified by the use of an “X” in conjunction with the numeral to indicate the “number of times” or “places” they are required. A full space is left betwee...
Aug 1, 2024 · Clarity: The primary goal of dimensioning is clarity. Every dimension should be unambiguous, leaving no room for doubt about its meaning or interpretation. This means choosing the right type of dimension for each feature, placing dimensions in logical locations, and using clear and consistent formatting.
In either case, the dimension line which is closest to the object should be placed approximately. 1/2″ away. The other dimensions beyond the first dimension (if any) should be approximately 3/8″ apart. You do not necessarily have to remember this, but you should remember not to crowd your dimension lines and to keep them a uniform distance ...
- Do not duplicate dimensions or add dimensions giving the same information in two different ways, except for the dual dimensioning or when you are adding a basic dimension.
- Add dimensions so that no calculation is required to infer any dimension. Also, add dimensions with the correct scale so that no scale conversion is required to infer the dimension.
- Dimensions should be added to the view which shows the shape of the part clearly.
- Don’t place dimensions directly on the object view unless it makes the drawing clearer.
These standards affect how dimensions are drawn, noted, and read. For instance, the ISO standards stipulate that all dimensions should be placed above the dimension lines, while the American standards demand that these be inserted in-between the arrowheads.
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When Should Dimensions Be Placed Inside or Outside the Drawing? Dimensions should generally be placed outside the drawing for clarity. However, if space constraints or drawing details make it necessary, placing dimensions inside is acceptable.
