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?
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
hereRules for Dimensioning
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