Line Convention.

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Presentation transcript:

Line Convention

LINE CONVENTION Precedence of coincide lines. Hidden line drawing. Center line drawing.

PRECEDENCE OF LINE Order of importance Visible line Hidden line Center

HIDDEN LINE PRACTICE Hidden line should join a visible line, except it extended from the visible line. Leave space Correct Join No !

HIDDEN LINE PRACTICE Hidden line should join a visible line, except it extended from the visible line. Leave space Leave space No ! Correct No !

HIDDEN LINE PRACTICE Hidden line should intersect to form L and T corners. L T Correct No ! No !

HIDDEN LINE PRACTICE Hidden arcs should start on a center line.

CENTER LINE PRACTICE In circular view, short dash should cross at the intersections of center line. For small hole, center line is presented as thin continuous line. Center line should not extend between views. Leave space Leave space

CENTER LINE PRACTICE Leave the gap when centerline forms a continuation with a visible or hidden line Center line should always start and end with long dash. Leave space Leave space Leave space Leave space