Dimensioning Angles, Arcs, Fillets and Rounds in Technical Drawings

Feb 21, 2022

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The technical drawing is a very important communication language between mechanics and mechanical engineers. So, technical drawings must be created or made according to the general international standardizations. If you draw your technical drawings that adopt these standards, other people around the world can understand what you ‘tell’ in your drawings.

Dimensioning is one of the most important parts of creating technical drawings. There are some kinds of standardizations for the dimensions of technical drawings also. In this article, you can find information about dimensioning the angles, arcs, fillets, and rounds in mechanical technical drawings.

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Dimensioning the Angles

There are various methods of dimensioning angles in technical drawings.

First of all, you can define one of the lengths and the angle of the slope according to this length.

Image Source: FREDERICK E. GIESECKE, SHAWNA LOCKHART, Technical Drawing With Engineering Graphics 15th Ed., Pearson, Pg.517

You can directly dimension the lengths of the angle corners like below.

You can give directly angle values as degrees or inches.

Dimensioning the Arcs in Technical Drawings

There can be various sizes of arcs in various technical drawings. According to the size, you can change the placement. You can place the dimension outside of the arc radius or inside of the arc radius according to the size. If the radius is big enough, you can place it on the inner side. If the radius is small, you can place it outside.

To define the radius, put ‘R’ before the radius value and place this value on the backside of the arrow shown below.

Dimensioning the Fillets in Technical Drawings

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Fillets are commonly used geometrical features in technical drawings. In most of the technical drawings created, fillets are generally of the same size. Instead of showing all the fillets with individual arrows and dimensions, you can indicate it on a side of the technical drawing page such as “FILLETS R4 OTHERWISE INDICATED”.

Dimensioning the Rounds in Technical Drawings

Like fillets, rounds are also commonly used in lots of parts in mechanical engineering. Like fillets, you can make a definition on technical drawing paper to define the radii of rounds on that part. If there is a different size of a round, you can dimension it like arcs.

Conclusion

As you see above, it is very simple to make dimensioning on technical drawings for arcs, angles, fillets, and rounds.

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