blueprint reading

Question 1

object line
____________________

Answer 1

description: thick solid line. To show visible shape of part (outline of object).

Question 2

hidden line
- - - - - - - - - - - - - - - -

Answer 2

Des: broken line of medium thickness. to show edges and outlines not visible to the eye.

Question 3

center line
__ ______ __ ______ __ ______ __

Answer 3

Des: fine, broken line made up of short and long dashes alternately spaced. to show the center of circles arcs and symmetrical objects and to aid in dimensioning these parts

Question 4

extension line
| |
| |
|<________________________>|

Answer 4

extension lines are fine lines that extend from object with slight break between. extension lines show dimensioning points.

Question 5

dimension line

|<_________________>|

Answer 5

dimension lines are are fine lines with arrow heads, unbroken except where the dimension is placed. touch the extension lines and show distance given by the dimension.

Question 6

leader line

___________________> both are on a angle <

___________________0

Answer 6

fine straight line with an arrow head or round solid dot at one end drawn at at an angle. points directly to a surface for the purpose of dimensioning or adding note a dot is used at the end of the straight line where reference is made to a surface area.

Question 7

cutting line
PREFERRED
* * note stars are arrows
|______ __ __ ______ __ __ ______|

alternate
* *
|________________________________|

• *
  |_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _|

Answer 7

The preferred cutting plane line is a heavy, broken line made up of a series of one long and two short dashes alternately spaced. arrowheads are placed at the right angles to the cutting plane line as shown alternate cutting lines are a solid heavy line or a series of long dashes.
purpose: to indicate where an imaginary cut is made through the object. the arrow points in the direction in witch the section should be viewed. letters next to the arrowheads identify the section in cases where more than one section is shown on the drawing. these lines are oriented vertically, horizontally, or at the actual angle at witch the part is drawn.

Question 8

section lines/ types of steal
steel
cast iron malleable iron, general use for all material
copper brass bronze and compositions
zinc lead white metal babbitt and alloys
magnesium aluminum and its alloys

Answer 8

series of fine lines – solid or solid and broken –arranged in specific patterns. they may be shown straight or curved. when shown straight, they are usually drawn at a 45 degree angle. however this angle will vary when applied to adjacent parts.
purpose. to indicate the imaginary cut surface referred to by the cutting plane line: to represent various kinds of materials.

Question 9

chain line
___________ _____ __________

Answer 9

heavy, broken line made up of a series of long and short dashes alternately spaced. purpose: indicates the location and extent of surface area.

Question 10

short break line
~-~-~-~-~-~-~-~-~-

Answer 10

heavy, irregular line drawn freehand.
purpose: to show a short break (to conserve space on a drawing);to show a partial section.

Question 11

long break line
_________/\/________/\/_________

Answer 11

ruled, ight line with freehand zigzags.
purpose: to show and long break (to conserve space on drawing).

Question 12

phantom line
_____ __ __ _____ __ __ ______

Answer 12

light, broken line made up of a series of one long and two short dashes. purpose: to show alternate positions of a part; to show relationship of exciting part to new part; to show machined surfaces.

Question 13

oblique

Answer 13

is at a 45 degree angle and a 90 degree angle

Question 14

isometric

Answer 14

both sides are at 30 degree angles

Question 15

sketching an arc

Answer 15

using a right angle as a guide for sketching an arc
guide points are located equidistant R from corner of right angle

Question 16

using a triangle as a guide for sketching an arc

Answer 16

dot located in approximate center of triangle

Question 17

standard sizes of commercial mechanical drawing sheets
A=
B=
C=
D=
E=

Answer 17

A= 8 1/2” x 11”
B=11” x 17”
C=11” x 22”
D= 22”x 34”
E= 34” x 44”

Question 18

sheet metal is defined as?

Answer 18

3/16” or less

Question 19

metal plate is greater than?

Answer 19

3/16” in thickness and is also more than 6” in width

Question 20

both plate and sheet are available in widths up to and length up to ?

Answer 20

200 inches width and 100 feet length

Question 21

flat bar stock

Answer 21

stock differs from plate and sheet in that width of the bar does not exceed 8”.