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The Time Project
Lesson 2: Convention Lines

The drawing below shows some of the convention lines used in Orthographic Drawings

Outlines - Thick and Continuous

Projection lines thinner than outlines

Centre Lines, chain lines
Hidden outside and short dashes

Dimension lines, Lighter than outside lines with arrow heads

Cutting plan; thick at ends with arrows

Break Lines; thin irregular

First Angle Orthographic Projection

Third Angle Orthographic Projection

(Above are all the Convention Lines needed on your drawings)



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