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Aug 1, 2024 · Reference dimensions are typically enclosed in parentheses to distinguish them from other dimensions. Dimension Placement Strategies. The placement of dimensions on a drawing is a critical aspect of effective communication. Proper dimension placement enhances clarity, minimizes clutter, and ensures that the drawing is easy to interpret.
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.
- 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...
Mar 14, 2024 · Dimension Placement. 16. Place dimension text outside the part view boundary or at least outside the part outer profile box. When space allows, place dimensions between views for features that are visible on both views. 17. When dimension text is too close, stagger dimension values so the text is easy to read. 18. Align the dimension lines when ...
- Faryar Etesami
Aug 1, 2024 · 1. Fitting dimensions refer to some important dimensions with fitting requirements between parts. 2. Relative position dimension indicates the important distance and clearance between parts to be ensured during assembly. 3. Machining dimensions during assembly. Some parts can be machined only after they are assembled together.
Mar 5, 2020 · Don’t dimension the clear widths of rooms unless they’re important. In most cases, they aren’t, so just locate one face of each partition to its nearest column line. Two cases where clear widths are often critical: (1) means of egress (e.g., stairs and corridors), which are governed by building codes; and (2) toilet rooms, where accessibility dimensions are governed by ADAAG or building ...
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The dimension line is a thin line, broken in the middle to allow the placement of the dimension value, with arrowheads at each end (see diagram below). An arrowhead is approximately 3 mm long and 1mm wide. That is, the length is roughly three times the width. An extension line extends a line on the object to the dimension line.
