Views, ContinuedRevolutionsA revolution is a view of an inclined surface obtained by revolving the object(not the observer as in auxiliary views) around an imaginary point until thedesired surface appears in true shape and size. The imaginary point is theaxis of revolution. Depending on the plane chosen, the axis is perpendicularto the plane of projection. Begin drawing revolutions by showing the objectin its normal position, then revolving the object around the axis of revolutionuntil the inclined surface is parallel to the plane of projection. Draw theplane of projection that is perpendicular to the axis first since it is the onlyview that remains unchanged in size and shape. You may revolve the objectclockwise or counterclockwise. The first drawing of the revolved object iscalled the primary revolution and each view drawn in a new position usingthe primary revolution as a base is referred to as successive revohtions.Three other important rules to remember when drawing revolutions: (1) therevolved view always shows the axis as a point and this view does not changein size and shape, (2) in views where the axis appears as a line, dimensionsparallel to the axis remains unchanged, and (3) lines that are parallel on theobject are parallel in any view.Figure 3-46 is a comparison of an auxiliary and a revolution view.Figure 3-46.—Comparing an auxiliary and revolution view.Continued on next page3-52
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
