1 / 9

Curved Surfaces and Centerlines

Curved Surfaces and Centerlines . Sections 11.02 and 10.07 of Text . Objectives . Understand how curved surfaces will appear in each viewing plane. Create orthographic projections of objects with curved surfaces. Correctly use center marks and center lines to add clarity to drawings. .

aldis
Télécharger la présentation

Curved Surfaces and Centerlines

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Curved Surfaces and Centerlines Sections 11.02 and 10.07 of Text

  2. Objectives • Understand how curved surfaces will appear in each viewing plane. • Create orthographic projections of objects with curved surfaces. • Correctly use center marks and center lines to add clarity to drawings.

  3. Curved Surfaces in orthographic • Similarly to the way inclined surfaces appear as an inclined edge in one view, curved surfaces will appear as a curved edge in one view and as a plane in the two remaining views.

  4. Orthographic Projection of a Cylinder • The figure below shows an orthographic projection of a cylinder • Centerlines and centermarks are used to denote the center of a circular or cylindrical feature. Centerlines Visible extents of cylinder Centermark Circular end of Cylinder CLICK

  5. Centerlines • In order to help others understand your drawings, it is necessary to include centerlines and centermarks. • A centerline alerts readers that the edges next to the centerline may be optical limits of a curved surface and not true sharp edges. • This case occurs every time a curved surface is shown as a plane. • The most common occurrence of a curved surface in engineering drawings is a hole with hidden and center lines.

  6. Centerlines • Centerlines are drawn by alternating long and short dashes along the length of the center of the cylinder or a circular hole.

  7. Centermarks Hidden lines • Centermarks show the center of a circular feature. This arc is 180° • Centerline and centermarks are used where the arc of a surface is 180° or greater. • Note that both centerlines and centermarks extend past the extents of the circle or circular feature. Center line Centermark This arc is 90° Centermark, note the extension lines Visible limit of arc Hidden lines Center line Hidden lines Center lines

  8. Line Precedence • Visible lines takes precedence over all other lines • Hidden lines take precedence over center lines • Center lines have lowest precedence • In this drawing, a visible line overlies a centermark. • Notice that the extension lines from the centermark are still visible.

  9. Curved Surfaces and Centerlines • Use this time to practice making orthographic projections from objects with curved surfaces. • Do not forget to include centerlines and centermarks as needed! • In class assignment

More Related