Before we get started on any technical drawings, let's get a good look at this strange block from several angles. . An extension line extends a line on the object to the dimension line. There is little choice on where to put its dimensions. If the isometric drawing can show all details and all dimensions on one drawing, it is ideal.
© Delphi Diesel Systems 1991 Unless otherwise stated the following are in accordance with the standard no s quoted: 1. Ordinate Dimensioning Ordinate dimensioning is also known as Datum dimensioning or Baseline dimensioning. Repeating a dimension will only confuse the reader and could cause errors in the manufacturing process. Any engineering drawing should show everything: a complete understanding of the object should be possible from the drawing. Also, some hidden lines on the non-sectioned part of the drawings are not needed figure 12 since they become redundant information and may clutter the drawing.
To provide a more the web is defined by a full line and the base and perpendicular parts only have been cross hatched. The lines are thin and are usually drawn at a 45-degree angle to the major outline of the object. Locate cylinders in the circular view but give its diameter and length in the rectangular view. The cross hatching should always be at 45° to the centre lines, with continuous lines 0. Tighter tolerances require precision manufacturing equipment which can increase the overhead cost associated with production.
Centerlines chain-dotted are used for symmetric objects, and also for the center of circles and holes. Figure 24 — Example drawing with a leader A leader may also be used to indicate a note or comment about a specific area. We are just showing the top view. Dimensions should line up in chain fashion or be grouped together as much as possible. In this case, the nominal dimension of 0.
The lines are thin and are usually drawn at a 45-degree angle to the major outline of the object. This allows you to see the inner components of the bearing system. Lines that are not parallel to these axes will not be of their true length. Find materials for this course in the pages linked along the left. Figure 19 - Full and sectioned isometric views The diagonal lines on the section drawing are used to indicate the area that has been theoretically cut.
The Unilateral Tolerance shows the nominal dimension 1. Proper dimensioning will help to manufacturers, engineers etc. Section lines are thin lines. Draughtsmen have always derived much personal satisfaction from producing drawings in ink or pencil where the linework and lettering is uniform and neat, and where the illustration completely defines the requirements of the specification. The Feature Control Frame can be broken down into three sections, shown here in blue. Figure 29 - Exampled of a dimensioned hole. Place dimensions outside the view, unless placing them inside improve the clarity.
This is how the remaining rear section would look. The views that reveal every detail about the object. You can see in the drawing above that 4 different view are used, the Front View bottom left , Top View top left , Side View bottom right and the Isometric View top right , and these different views set the foundation for how the component will be dimensioned and toleranced. Hidden lines are shown in the non-sectioned area of a broken section. Imagine a plane that cuts vertically through the center of the pillow block as shown in figure 15.
The views that reveal every detail about the object. Which views should one choose for a multiview drawing? This allows you to see the inner components of the bearing system. Unfold the box figure 4 and you have the three views. A leader is a thin line used to connect a dimension with a particular area figure 24. These handwritten notes became a source of error as organizations began scaling up or when those notes needed to be translated to other languages. Where To Put Dimensions The dimensions should be placed on the face that describes the feature most clearly. An arrowhead is approximately 3 mm long and 1mm wide.