4Isometric Drawings The most common pictorials Constructed with the two faces 30 degrees above the horizontalThe axes are 120 degrees between each axisLines that are horizontal are drawn at 30 degreesVertical lines remain vertical
8Oblique DrawingsThe front view is draw like it would be using orthographic projectionThe front view shows all features with true shape and sizeThe top and side view are then projected back from the front viewViews can be at any angle15, 30 or 45 degrees are common
9Oblique Drawings Cont.Useful when the front contains more details and features than the side viewA mental image can be created more quickly than with orthographic aloneTwo types of oblique drawingscavaliercabinet
15Perspective Drawings The most realistic of all pictorial drawings Receding lines in the drawing “meet” at a vanishing point instead of being parallelEliminates distortion at the back part of pictorial drawingsTwo typesparallel (one-point) perspectiveangular (two point) perspective
17Parallel Perspective (One Point) One face of the object is shown as the front viewLines parallel to the front view remain parallelLines that are perpendicular to the front view converge at a SINGLE VANISHING POINT
18Angular Perspective (Two-Point) Similar to isometric drawingsOne edge of the object is place in frontThe two faces that meet at this edge recede to DIFFERENT VANISHING POINTSAll lines parallel to each face go to the different vanishing points
23Dimensioning Standards Standards are different in different career areas.Civil, Electrical, Construction and other areas follow similar practices, but sometimes with less need for precision in measurements.Dimensioned drawings are a part of a contractual document.
24Dimension Lines Various means to terminating ends arrow headdottickNormally, dimensions are shown ABOVE dimension lineIf dimension is needed for construction, it should be on drawingDo not included unnecessary dimensions