What are dimensions in engineering drawing?

What are dimensions in engineering drawing?

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.

Which line is used for dimension line in engineering drawing?

Dimension Line: Dimension line is a continuous thin line. it is indicated by arrowheads, it is drawn parallel to the surface whose length must be indicated. Projection or Extension Line: A projection line or extension line, it is a thin line. It is drawn perpendicular to the surface which is to be dimensioned.

How do you mark dimensions in engineering drawing?

Dimension lines should be spaced uniformly throughout the drawing. They should be at least 3/8″ from the object outline and 1/4” apart. 13. No line of the drawing should be used as a dimension line or coincide with one.

What is dimension 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 the 3 components of dimension lines?

Dimensions have several distinct elements: dimension text, dimension lines, arrowheads, and extension lines. Dimension text is a text string that usually indicates the measurement value. The text can also include prefixes, suffixes, and tolerances. A dimension line indicates the direction and extent of a dimension.

What are the two classifications of dimensions?

There are two classifications of dimensions: size and location.

What is the technique of dimensioning in drawing?

1. Technique of dimensioning: the standard for appearance of lines, the spacing of dimensions, the size of arrowheads, and so on allow others to interpret your drawing. A typical dimensioned drawing is shown below. Note the strong contrast between the visible lines of object and the thin lines used for dimensions. 9-4 Learning to Dimensioning 2.

What are the dimensions of a drawing outline?

1 Dimension and projection lines are narrow continuous lines 0.35 mm thick, if possible, clearly placed outside the outline of the drawing. As previously mentioned, the drawing outline is depicted with wide lines of 0.7 mm thick. The drawing outline will then be clearly defined and in contrast with the dimensioning system.

What are the ISO rules for dimensioning drawing?

British Standard 8888 covers all the ISO rules applicable to dimensioning and, if these are adhered to, it is reasonably easy to produce a drawing to a good professional standard. 1 Dimension and projection lines are narrow continuous lines 0.35 mm thick, if possible, clearly placed outside the outline of the drawing.

How to mark dimension in an engineering drawing?

Place a dimension from the edge (top and right side maybe) to one of the holes or identify the width and height dimensions as datums. Thin is not an issue… though if the part distorts in the free-state condition you might consider a note indicating the part is restrained flat. Tell me and I forget.