Technical Drawing and CAD BDA 10703 Orthographic Projection Prepared by: MUHAMMAD FARID BIN SHAARI
Sep 25, 2015
Technical Drawing and CADBDA 10703
Orthographic ProjectionPrepared by:MUHAMMAD FARID BIN SHAARI
Outcomes Draw section view and understand its concept Full section, half section & offset section Broken section, revolved section, interposed section & aligned
section Hatching
Section view
Why?Document the design and manufacture
of single parts which are manufactured as one piece.
Document how multiple parts are to be assembled or built.
Aid in visualizing internal workings of a design.
What? Cut part view. Solid part of the cut
is remained and sketched using hatch.
Section views
Internal working
No. of components
Piece by piece shape
Courtesy from Maserati
Section view
http://www.smcars.net/threads/ferrari-testarossa-512-tr-1984.8629/
http://commons.wikimedia.org/wiki/File:IC_engine.JPG
Section view the characteristics
Section view drawing steps Determine the cutting plane and the direction of viewing by
adding two solid, dark arrows on one of the multi view projection. Draw another multi view projection which is going to be cut. Draw hatch lines on the solid cut. If there are two and more components, change the degree of the
hatch lines.
Cutting plane line The preferred cutting plane line style is made up of equal dashes
ending in arrowhead. Another style uses alternating long dashes and pairs of short
dashes
Hatch rules
Show edges and contours which are now visible behind the cutting plane
Omit hidden lines in section views A section-lined area is always completely bounded by a visible
outline The section lines in all hatched areas for that object must be
parallel Visible lines never cross section lined areas
Rules for lines
Hatch techniques
Section line symbols
Section line: Spring and thread
http://www.linotype.org/OnLineDocs/GenMaint/GMCasting.html
http://commons.wikimedia.org/wiki/File:Ramsbottom_safety_valve_(side_only)_(Heat_Engines,_1913).jpg
Section line: Spring and thread
Section line: Seals, O-ring, washer
! " # $ % "
http://www.nomenclaturo.com/tag/brake
Section view general types
Section view
HalfFull
Section view
Broken out OffsetRib Aligned
Revolve Breaks
Broken section
Offset section
Revolve section
Rib section
Break
Aligned section