How to Place Dimensions Neatly on Technical Drawings?

Technical drawings are the common language between engineers, workers, and technicians that are dealing with the same topics. For example, you can find lots of kinds of articles in Mechanicalland about technical drawings in mechanics. 

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So, it is very important to comply with the strict rules of technical drawings to be understood by others reading8 them. In general, these rules and standards are defined by different standardization institutes such as ANSI in the US, ISO in the EU. 

Like other standards and rules, placing dimensions and dimensions lines have strict rules on technical drawings. Here, we explain these rules. 

Rules to Show Dimensions on Technical Drawings

Place dimensions in a row.

For appearance, you should comply with these rules; 

  • For the values on dimension lines that are placed in a row, you need to place the values in the same row, not scattered. 

Hidden lines are not dimensioned. Only the solid lines are dimensioned. Hidden lines are for showing not visible sections of a part on technical drawing. If it must be dimensioned, you need to add a view to make that hidden section visible on the technical drawing. 

(Image Source: FREDERICK E. GIESECKE, SHAWNA LOCKHART, Technical Drawing With Engineering Graphics 15th Ed., Pearson, Pg. 514).
  • Hatched areas also can be dimensioned. But when you place the dimension value, it will be better to place to dimension line outside the hatched area. You can also place dimension value by creating space on the hatch pattern. 
  • If you are dimensioning a rectangular appearing section on a view but it is a cylindrical section, use the diameter symbol(ø) near the dimension value. 


Maybe these are the most basic things that you can consider when you are drawing your technical drawings. But, to get advanced in this issue, experience over this thing is the most important teacher to fully adopt these basic but important rules in technical drawings. 

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