5-2) Blueprints & Technical Drawings Flashcards
?What are the 3 types of drawings (prints) commonly used in aviation?
Detail, assembly, installation
What are the characteristics of a detail drawing?
Used for a single item that is as detailed as possible. Can be used to help machinists manufacture parts. Can represent something small like a rivet to entire engine turbine parts. In the legend, a code is established to identify each of the materials used in construction. Drawings are usually in 3 views. Each element of the drawing is described in an index that helps machinists reproduce the part exactly.
What type of line is ‘A’ and what is it used for?
Visible Outline
Indicates the outline of that view of the drawing. Could be the limit of the part in view shown. Could be the outline of the part.
What type of line is ‘B’ and what is it used for?
Hidden Outline (Dashed Line)
Shows a hidden detail like a groove or cut on the opposite side of the part. Turn the part over and that line would become a Visible Outline.
What type of line is ‘C’ and what is it used for?
Center Line
Shows the center of a detail from an edge or in this case, the center of a drilled hole. This also gives extension lines to help locate the references the hole might have to other detail.
What type of line is ‘D’ and what is it used for?
Extension Line
Shows a reference used for either aid in measuring, or this could be used as a balance reference. This line will have a distinct break in it to isolate it from the actual part.
What type of line is ‘E’ and what is it used for?
Dimension Line
Combined with other lines, this shows critical measurements. This will normally be the only numbers shown in the drawing.
What type of line is ‘F’ and what is it used for?
Cutting Plane
This helps the machinist orient the part for measurement. Each of the three views will have a different cutting plane.
What type of line is ‘A’ and what is it used for?
Phantom Line
Used to show a relationship to or to help visualize another part. In this example, the drawing is showing a phantom pin.
What type of line is ‘B’ and what is it used for?
Short Break
Used to indicate that a part of a drawing shows that some part of the drawing is removed to allow clarity.
What type of line is ‘C’ and what is it used for?
Section Lining
Another form of removing some of the structure to help show some other detail that would be hidden otherwise. In this example, the cutaway is section A-A (not shown in picture). Also this section gives a clue of the material composition by matching the shading/gradation on the section lining with the materials section line legend.
What type of line is ‘D’ and what is it used for?
Long Break
This is used for long sections of removed detail.
What type of line is ‘E’ and what is it used for?
Leader Line
Line that direct the reader from a note to a corresponding detail. This could be to a special instruction for drilling or even a drill bit size. This is showing a center line of it rivet or bolt.
What type of line is shown here and what is it used for?
Break for Solid Bar
This is used to detail a bar that would be off the page if the whole part had to be drawn.
What type of line is shown here and what is it used for?
Break for Hollow Tube
Will have a distinct edge in the metal. Used to detail a hollow part that would be off the page if the whole part had to be drawn. No indication of tube wall thickness.
What type of drawing is this and what is it for?
Three View Drawing
Used to show a 3D representation of a product. This could be used to show overall length, height and width. Three view drawing normally would not show exact details, but just a generation representation of the item.
What type of drawing is shown here and what are its key characteristics?
Detail Drawing
Contains all required features and dimensions of a part, materials, finishes and special treatments. Good machinist should have all the information needed to produce the part to a desired specification. This particular example includes an installation drawing to help the manufacturer to visualize the part’s use and location. This type of drawing can also help to determine the function and how it operates.
What type of drawing is shown here and what are its key characteristics?
Assembly Drawings
Depict relationship between two or more parts. These drawings reference individual parts by their part number and specify the type and number of fasteners needed to join them. This allows technicians to determine if parts are missing and also shows the order of assembly. This example even shows the next higher assembly drawing.
What type of drawing is shown here and what are its key characteristics?
Installation Drawings
Contain all subassemblies shown in their relative position in an exploded view. They do not show all of the individual parts for each item in the drawing. For example, this drawing shows all of the individual washers and nuts needed to connect the electrical wires but does not show the individual part used to construct the receptacle shown in the drawing. They also contain a bill of materials, dimensions for adjustment and fasteners needed to complete the installaton.
What type of drawing is shown here and what are its key characteristics?
Sectional Drawings
Used when internal construction or shape cannot be seen by viewing the part directly. This type of drawing is helpful in determining the function of a part. Only parts that need to be shown in cross section are cutaway like this. In this example, the check valve itself is cut away to real the flapper valve. It is assumed that the reader knows the function and construction of a B-Nut connector and those are shown in non-cutaway. This type of drawing is also useful in showing the orientation of lesser parts such as o-rings and gaskets.
What type of drawing is shown here that looks like an Assembly Drawing and what are its key characteristics?
Exploded View
Looks similar to an assembly drawing. Differences are in how the drawings are used. Exploded view drawings are common in Illustrated Parts Catalogs (IPC) while assembly drawings are used in Maintenance Manuals (MM). Some manufacturers use the same drawing for both publications to save time and money.
