ED Tips : Dimensions for orthographic view

A dimensioned drawing should provide all the information necessary for a finished product or part to be manufactured. An example dimension is shown below.

Dimensions are always drawn using continuous thin lines. Two projection lines indicate where the dimension starts and finishes. Projection lines do not touch the object and are drawn perpendicular to the element you are dimensioning.

All dimensions less than 1 should have a leading zero. i.e. .35 should be written as 0.35

•Parallel Dimensioning

•Parallel dimensioning consists of several dimensions originating from one projection line.

•Superimposed Running Dimensions

•Superimposed running dimensioning simplifies parallel dimensions in order to reduce the space used on a drawing. The common origin for the dimension lines is indicated by a small circle at the intersection of the first dimension and the projection line.

Chain Dimensioning

Dimensioning of circles

•(a) shows two common methods of dimensioning a circle.

One method dimensions the circle between two lines

projected from two diametrically opposite points. The second

method dimensions the circle internally.

•(b) is used when the circle is too small for the dimension to be easily read if it was placed inside the circle.

Hope you find it useful!

Enjoy!