What are dimension and extension lines?

What are dimension and extension lines?

The term “extension line” is often used interchangeably with “dimension line”; however, they are two distinct tools when dealing with technical drawing. Dimension lines present certain measurements of and between items in a drawing. Extension lines, on the other hand, are seen simply as extensions of these items.

What is extension line?

Extension lines continue or extend from the surface of the object and establish the size of the dimension. They do not touch the object lines and extend slightly past the dimension line. Extension lines provide a means of displaying a measurement without placing the dimension on the part.

What is dimension line in drawing?

Dimension lines indicate the measurements of objects in a drawing. You can add several types of dimension lines: • Vertical or horizontal dimension lines — measure the vertical (y-axis) or horizontal (x-axis) distance between any two nodes.

What is the difference between a dimension line and an extension line in Autocad?

Arrowheads, also called symbols of termination, are displayed at each end of the dimension line. You can specify different sizes and shapes for arrowheads or tick marks. Extension lines, also called projection lines or witness lines, extend from the feature to the dimension line.

What are the types of dimension lines?

The basic types of dimensioning are linear, radial, angular, ordinate, and arc length.

What is dimension in engineering drawing?

Dimensions. • A dimension is for size and position (of the designed/modeled shape). • A DIMENSION is a numerical value expressed in appropriate units of measurement and used to define the size, location, orientation, form or other geometric characteristics of a part.

What are extension lines Leader lines and dimension lines?

Extension lines are also thin lines, showing the limits of dimensions. Dimension line arrowheads touch extension lines. Leaders are more thin lines used to point to an area of a drawing requiring a note for explanation. They are preferably drawn at a 45° angles.

How do you draw a dimension line?

To draw a vertical or horizontal dimension line, click the Horizontal or vertical dimension tool . Click to place the starting point, and drag to where you want to place the endpoint of the dimension line. Move the pointer to position the dimension line, and click to place the dimension text.

What are dimension lines?

The dimension line is a fine, dark, solid line with arrowheads on each end. It indicates direction and extent of a dimension. In machine sketches and drawings, in which fractions and decimals are used for dimensions, the dimension line is usually broken near the middle to provide open space for the dimension numerals.

What is dimension in drawing?

The exact shape of an object is communicated through orthographic drawings, which are developed following standard drawing practices. The process of adding size information to a drawing is known as dimensioning the drawing.

What are dimensions and elements?

A dimension is a list of related items, called elements, which you would find listed down the rows, or across the columns of a report. For example, the dimension Region might contain elements France, Germany and United States. Dimensions are used to construct cubes, and serve as indexes to the data in a cube.

What is the dimension line?

Where does the Dimension line meet the extension line?

An extension line is a thin, dark, solid line that extends from a point on the drawing to which a dimension refers. The dimension line meets the extension lines at right angles, except in special cases. A gap of about 1.5 mm should be left where the extension line would join the object outline. The extension

What is the definition of an extension line?

Extension lines are also thin lines, showing the limits of dimensions. Dimension line arrowheads touch extension lines. Leaders are more thin lines used to point to an area of a drawing requiring a note for explanation. They are preferably drawn at a 45° angles.

What’s the difference between leader line and extension line?

Extension line is the thin solid line perpendicular to a dimension line indicating which feature is associated with the dimension. Leader line is the thin solid line used to indicate the feature with which a dimension, note, or symbol is associated. Tolerance is the amount a particular dimension is allowed to vary.

What’s the minimum spacing between the extension lines?

Standard Practices-Placement  Dimension placement dependson the space available between extension lines. When space permits, dimensions and arrows are placed between the extension lines.  The minimum distance from the object to the firstdimension is 10mm (3/8 inch). The minimum spacing between dimensions is 6mm (1/4 inch).