Engi 1504 – Graphics. Lecture 5: Sectioning and Dimensioning Sectioning an object Sectioning symbols Locating sections conventions Dimensioning Class assignment 5. Intro to Sectioning. We know what the outside looks like, but what’s going on inside?
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Lecture 5: Sectioning and Dimensioning
Cutting plane is optional
Note: Can also be included on a separate piece of paper for large objects (like buildings).
Imagine them in rotated position!
Rotate holes in section view
Notes on drawing
ALL DIMENSIONS IN MILLIMETRES
Edge A could be 1.5mm too big
Edge B could be 2mm too short
Show where shape shows best
Group dimensions around features
and don’t use visible boundary lines for extension lines*
Place the largest dimension farthest from the part boundary
long extension lines;
dimensioning to hidden lines;
crossing dimension lines with extension lines