Easy Ways to Dimension in Drawings: Simple Methods Explained

Dimensioning is a crucial aspect of technical drawing that provides essential measurements and details to accurately construct or assemble objects. It's crucial to understand and practice various dimensioning methods to ensure the clarity and correctness of your drawings. Let's delve into some of the different methods of dimensioning with simple drawing examples.

Dimensioning not only adds crucial information to your drawings but also makes them more readable and easy to understand. It's like providing a set of clear instructions to ensure the final product closely resembles the drawing.

Linear Dimensioning

Linear dimensioning, also known as rectilinear dimensioning, is the most common type of dimensioning. It's used to indicate the distances between two parallel lines or between two points on a straight line.

Consider a simple rectangle. To dimension it linearly:

Draw a leader line from the dimension text to the object being dimensioned.

Add an arrowhead at the end of the leader line that touches the object.

Place the dimension text parallel to the line being dimensioned, above the leader line.

Parallel Alignment

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When dimensioning parallel lines, place the dimension line parallel to the lines being dimensioned. Use arrowheads at both ends of the dimension line to indicate where the dimension applies.

For example, in a top view of a rectangle, dimension the length and width as follows:

Perpendicular Alignment

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When dimensioning perpendicular lines, place the dimension line perpendicular to the lines being dimensioned. Use an arrowhead only at the end that touches the object. The other end can extend beyond the object.

Using our rectangle example, dimension one of the diagonals like this:

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Aligned Dimensioning

Aligned dimensioning is used when dimensioning more complex objects or when standard linear dimensioning isn't feasible. It's also known as baseline or chain dimensioning.

In aligned dimensioning, dimension lines are placed one above the other, creating a visual alignment that makes it easier to read and understand the drawing.

Baseline Dimensioning

Baseline dimensioning is similar to aligned dimensioning, but all dimension lines share a common baseline. It's particularly useful when dimensioning an array of similar features.

For instance, in a top view of a building with multiple identical rooms, you can dimension the room depth as follows:

Chain Dimensioning

Chain dimensioning is used when the objects to be dimensioned are closely spaced. It's similar to aligned dimensioning, but the dimension lines are connected by short leader lines, forming a chain.

Using a top view of a bridge with multiple identical truss spans, you can dimension the span length like this:

In the realm of technical drawing, practicing different dimensioning methods is akin to learning a new language. Each method has its use cases, and mastering them enables you to create clear, comprehensive, and easy-to-understand drawings. So, get your drawing tools ready and start practicing today!