ENGR-22_Lec-11_Section-Views-1.ppt 1 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Bruce Mayer, PE Registered Electrical & Mechanical Engineer Engineering 22 Section Views-1

ENGR-22_Lec-11_Section-Views-1.ppt 2 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Learning Goals  Properly Create Section (Cut-Away) Views to Show Internal Features Of Objects That Are Not Easily Understood In Standard Orthographic Projection View Drawings

ENGR-22_Lec-11_Section-Views-1.ppt 3 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Learning Goals cont  Use and/or Apply How & Where to Construct the Cutting Plane Line Section Lines (a.k.a. “Hatch Lines”) Several Types of Section Drawings

ENGR-22_Lec-11_Section-Views-1.ppt 4 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Section Views  Definition: An Orthographic Technical Drawing That Reveals Details About INTERNAL Features By Displaying The Part As If Cut By An Imaginary Plane

ENGR-22_Lec-11_Section-Views-1.ppt 5 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Section Views cont  Usefulness: Makes the Drawing More Understandable, Especially The Internal Details Of The Part Since The Sectioned Drawing Shows Internal Features There Is Generally NO NEED To Show HIDDEN Lines Especially helpful for –Complex Part Fabrication –Assembly Drawings

ENGR-22_Lec-11_Section-Views-1.ppt 6 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Some Assembly Drawings

ENGR-22_Lec-11_Section-Views-1.ppt 7 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics The Cutting Plane  An imaginary plane that defines where the object is cut  Shown in drawing ADJACENT to the Sectioned View  Drawn with the PHANTOM or HIDDEN line type  Arrows at the end of the cutting plane line indicate the direction of view for the sectioned drawing.

ENGR-22_Lec-11_Section-Views-1.ppt 8 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics The Cutting Plane cont.  The arrows point TOWARD the part of the object that is VISIBLE in the sectioned view  A sectioned drawing follows the general rules of any view in an OrthoGraphic MULTIVIEW drawing

ENGR-22_Lec-11_Section-Views-1.ppt 9 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Multiple Cutting Planes  Cutting planes may be labeled at their endpoints if multiple cutting plane lines are used  When using multiple cutting planes each sectioned drawing is drawn as if the other cutting plane lines do not exist  The cutting plane line takes precedence over center lines  Cutting planes may by omitted when their location is obvious

ENGR-22_Lec-11_Section-Views-1.ppt 10 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Section View Placement  The Section View is Placed “Opposite” to the Direction of the Cutting Plane Arrows The Arrows are Rotated INTO the Paper to Reveal the Section

ENGR-22_Lec-11_Section-Views-1.ppt 11 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Cross Hatch Lines  Cross-Hatch Lines are drawn where the object passes through the cutting plane  If a saw were used to cut the part then Hatch lines represent the cutting (tool) marks left by the saw blade  Different materials may be represented by the use of different Hatch line types The general Hatch line type which may be used for any material is the line type for IRON

ENGR-22_Lec-11_Section-Views-1.ppt 12 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Hatch Line Conventions  Hatch lines should NOT be PARALLEL or PERPENDICULAR to object lines  Hatch lines are generally drawn at 45° unless this conflicts with other rules  Hatch lines should be oriented at different angles for separate parts  Occasionally Hatch lines are only drawn on the perimeter of large areas (not an issue with CAD)  Hatch lines are not used for thin parts rather they are filled in solid (Do not use closely spaced Hatch lines)

ENGR-22_Lec-11_Section-Views-1.ppt 13 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Section Line Conventions cont.  Cutting Plane Lines Take Precedence over Center Lines  Hatch Line Density Should Clearly Identify the Cut Material Not be Too Dense As This Tends to Obscure Object lines

ENGR-22_Lec-11_Section-Views-1.ppt 14 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Sketch Demo  Using the White Board, Let’s Make Some Cross Section Drawings A B C

ENGR-22_Lec-11_Section-Views-1.ppt 15 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-A Solution

ENGR-22_Lec-11_Section-Views-1.ppt 16 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-B Solution

ENGR-22_Lec-11_Section-Views-1.ppt 17 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-C Solution

ENGR-22_Lec-11_Section-Views-1.ppt 18 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics All Done for Today Blue Print CrossSec Circa 1862

ENGR-22_Lec-11_Section-Views-1.ppt 19 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Bruce Mayer, PE Licensed Electrical & Mechanical Engineer Engr/Math/Physics 25 Appendix 

ENGR-22_Lec-11_Section-Views-1.ppt 20 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-A Solution - 1  Grid it

ENGR-22_Lec-11_Section-Views-1.ppt 21 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-A Solution - 2  Connect Dots to Block In OutLine

ENGR-22_Lec-11_Section-Views-1.ppt 22 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-A Solution - 3  Connect Dots to Reveal Sliced Edges

ENGR-22_Lec-11_Section-Views-1.ppt 23 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-A Solution - 4  Construct View of Rounded- End Slot Circle Trim Pedit (turn ½-circles into Plines) Pline

ENGR-22_Lec-11_Section-Views-1.ppt 24 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-A Solution - 5  Connect the Dots to Reveal Sliced Areas  Hatch the Sliced Areas

ENGR-22_Lec-11_Section-Views-1.ppt 25 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-A Solution - 6  Strip Out Constr Lines, and Add Center Marks & Lines to Show Completed Cross- Section

ENGR-22_Lec-11_Section-Views-1.ppt 26 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-B Solution

ENGR-22_Lec-11_Section-Views-1.ppt 27 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-B Solution

ENGR-22_Lec-11_Section-Views-1.ppt 28 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-C Solution

ENGR-22_Lec-11_Section-Views-1.ppt 29 Bruce Mayer, PE Engineering 22 – Engineering Design Graphics Prob-C Solution