UNDERSTANDING OF ENGINEERING

DRAWINGS

Engineering Drawings

Engineering drawings are industrial language.Engineering drawings communicate design requirements to machinist, inspector, assembler etc.

Lines on an Engineering Drawing

Lines on an Engineering Drawing

Lines on an Engineering Drawing

Lines on an Engineering Drawing

Lines on an Engineering Drawing

Lines on an Engineering Drawing

Lines on an Engineering Drawing

Orthographic Projection Views

Orthographic Projection Views

Exercise

Exercise

Tolerances

Tolerances

Tolerances

Allowances & Fits

Allowances & Fits

Allowances & Fits

Threads

Terminology

Threads

ThreadsExternal Thread DesignationM10 X 1 – 5g 6g

ThreadsInternal Thread DesignationM10 X 1 – 5H 6H

ThreadsTolerance Grades

Chamfers

Surface Roughness

Ra = Roughness Average

Rz = Max height of profile

Units = µm

Surface Roughness

RzRa

Some Symbols

Some Symbols