TECH 104 – Technical Graphics Communication Week 4: Multiview Drawings - 2

TECH 104 – Technical Graphics Communication Here’s what we talked about last time….. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Here we can see all the principle views of an object as the glass box is unfolded. It is easy to see that some of the principle views have more detail through the use of object (visible) lines than others. Always choose views that have the least amount of hidden lines in them and show the most detail. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Surfaces will appear as edges at times. Edges may be foreshortened (shorter than normal), or “True Length” (TL). Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Oblique edge lines are created by oblique surfaces. These are surfaces that are neither true shape or true size in any principle view. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Holes and cylinders may appear “True Shape and Size” (TSS), or foreshortened depending on the view in which they appear. (Foreshortened circles will appear as ellipses.) Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Let’s now take another look at multiview drawings in more detail….. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication We place hidden lines in a drawing to do the following things: Show hidden features 2. Clarify the position and shape of features 3. Make the “plate” more readable (NOTE: The term “plate” refers to a finished drawing.) Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Note how hidden lines follow specific rules as to how they are to be laid out. Depending on the application, hidden lines will either touch other hidden lines, or pass over them Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Center lines are used to show the theoretically perfect center of holes, arcs, cylinders and bolt circles*. *A “bolt circle” is used to position holes or cylinders in a circular pattern. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Center lines extend past the objects they are used to describe. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Center lines will break their normal shape of a long dash interrupted by a short dash if an object or hidden line needs to take precedence. In these examples, only a short dash is used to show the center line. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication When only a short dash is used to represent a center line, there must be some space shown between the object and the short dash. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Machined Holes: Here, we can see many examples of the different styles of holes that are used in manufacturing. Each has a specific layout when it comes to displaying them with hidden lines. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Rounds and Fillets are used to relieve stress and finish edges on manufactured goods. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication “Runouts” are used to show the topology of cast parts. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication More examples of runouts. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication “Intersections” are used to show the union of two or more cylinders. Several types of examples are shown here. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Intersections between cylinders and prisms. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Partial views are often used to simply symmetrical objects. or to........ Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication …focus on only part of the object. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication “Revolved” views are used to give a clearer representation of an object. We actually “draw the object incorrectly to make it easier to understand”. Here, webs have revolved to 12, 3 and 6 o’clock positions to make the view easier to visualize. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Here, the correct view of the object will appear to be a mass of hidden lines in the right side view. By representing only the 12 & 6 o’clock positions, we create a view that is easier to understand. Further notes would be added to the front view during dimensioning. Week 4: Multiview Drawings 2

TECH 104 – Technical Graphics Communication Arms and spokes are often revolved to create a view of the object that is easier for the human brain to visualize. Week 4: Multiview Drawings 2

CAD Commands used to create “protos” A, B & C: LIMITS GRID SNAP LAYER TECH 104 – Technical Graphics Communication CAD Commands used to create “protos” A, B & C: LIMITS GRID SNAP LAYER Week 4: Multiview Drawings 2

Sketching Assignments TECH 104 – Technical Graphics Communication Sketching Assignments Given two orthographic views of an object, your task is to create the missing view. The given views may also have some missing lines that need to be added. Week 4: Multiview Drawings 2

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TECH 104 – Technical Graphics Communication Week 5: Auxiliary Views