Print Reading Types of Drawings Working drawing used

Print Reading

Types of Drawings • Working- drawing used to produce objects • Assembly- shows object fully assembled • Detail- shows each part of assembly

Working Drawing

Assembly Drawing

Detail Drawing

Orthographic projection • a method of projection in which an object is depicted using lines & planes

Views • Direction from which an object is seen

Types of views • • • Front view-most of the overall shape Right side view- to the right of the front view Left side view- to the left of the front view Top view- view from above the front view Bottom view- view below the front view Back view- view directly opposite of the front view

Using a working drawing- Points • Each point on the object is given a lower-case letter or number • Start on the left hand side, closest to the viewer • Surface is defined by all of the letters on the corners of the surface • Separate with a COMMA

Using a working drawing • Lines are separated with a dash (-)

Types of Lines • Object lines- outline of the object that can be seen in that view

Hidden Lines • Cannot be seen in the view due to material in front of them. • Dashed lines • Thinner than object lines

Centerlines • Center of a radius, circle, cylinder • Runs through exact center of a hole • Short and long dashes

Dimension Lines • Placed ½” away from outer edge of object. • Skinny, with arrowhead

Extension Lines • End points of dimensioned lines are marked lines= extension lines • Thin solid lines

Section Lines • Used when an inside feature needs to be shown • Hypothetically cuts an object in half • Shows direction of the cut • Thickest line. Long short long

Leader Lines • Size of a corner radius or hole is given using a leader line • Leads to a clear area on drawing