Revolved, Removed, and Offset Sections In Technical Drawings

Revolved, Removed, and Offset Sections In Technical Drawings

Technical drawing is the common language between people who are dealing with the same professions. In mechanics and mechanical engineering, there is a common language between the designers and manufacturing workers. If a part is designed, all the tolerances and dimensions of the part are shown by technical drawings. These technical drawings include how to manufacture these parts and part surfaces also.

Technical Drawing with Engineering Graphics

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But these technical drawings are created according to some standards. These standards are defined by some international institutions such as ASME or DIN. Sectioning of the parts and assemblies must be established according to these standards.

Revolved Sections In Technical Drawings

Revolved sections are technical drawings that are frequently used to show the cross-sectional shapes of long parts. To make revolved sections to show the cross-section, draw the cross-section on the part which is revolved case of the cross-section to show to the reader. And add a hatch pattern on that cross-section and never use the visible lines over the revolved cross-section. Check the example below.

Correct and incorrect use of revolved sections in technical drawings(Image Source:https://draftingmanuals.tpub.com/14276/css/Revolved-Sections-184.html)

Removed Sections In Technical Drawings

The removed section technique is a very useful technique to show the important details of a complex part on the technical drawing sheets. To create a removed section from a part, you need to show the section as section A-A, section B-B, etc. on the main part. Then show the section cut view on the other part of the sheet to show additional details. Check the example below to understand how to use removed sections on technical drawings.

Removed sections in a complex technical drawing(Image Source: FREDERICK E. GIESECKE, SHAWNA LOCKHART, Technical Drawing With Engineering Graphics 15th Ed., Pearson, Pg.340).

Bigger scales are used to show removed sections, in general, to show the details more correctly. If multiple revolved pr partial sections are shown on technical drawing sheets, the spelling must start from A from the right side of the sheet.

Offset Sections In Technical Drawings

While you are creating a section view of a part, you can realize that it is not sufficient to show all the necessary details with a straight section line. In this case, you can use the offset section line which includes all the required internal details that must be shown on the technical drawing.

The most important rule o create offset sections are all the bends of the section line must be 90 degrees. Another important rule is that the bent sections must not be shown as discrete sections while creating a hatch pattern to show that section.

Use of offset section view(Image Source: https://openoregon.pressbooks.pub/blueprint/chapter/unit-7-sectional-views/).

Check the example of offset section lines on a part in the technical drawing above to understand the rules.

Conclusion

Use of the revolved, removed, and offset sectionings in technical drawings is very simple and useful like above.

Do not forget to leave your comments and questions below about the revolved, removed, and offset sections in the technical drawings below!

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