Basic Drafting Section 1; Pg 8-16

Question 1

How many types of basic drawings are there in drafting? Name them.

Answer 1

Two. Pg 8

Orthographic Projection.
Pictorial.

Question 2

Describe an “Orthographic Projection”

Answer 2

It represents a three-dimensional object in two dimensions. Pg 8

3D shape beside multiple 2D shapes

Uses the glass box method. Think of the work sheets where we had a 3D shape and tried to figure its 2d counterpart, or vise-versa.

Question 3

What method is used to create an Orthographic Projection?

Answer 3

The “glass box” method is a way to describe how the various orthographic views are generated for an object. Pg 8

Question 4

Describe a Pictorial Drawing.

Answer 4

Pictorial drawings are used to study the appearance of an object. Pg 8

Pictorials can be divided into two categories: True pictures (perspective drawings), and distorted pictures (isometric drawings).

Question 5

What categories are Pictorial Drawings divided into. Describe their appearance.

Answer 5

Pictorials can be divided into two categories: Pg 8/9

True pictures (perspective drawings), think of a road that slowing gets smaller the further it appears.

Distorted pictures (isometric drawings). The centre point being the corner of the object.

Question 6

What is the use of Alphabet lines?

Answer 6

Alphabet lines are used to read drawings. They are the lines with specific meanings to make blueprint reading easier.

Question 7

What type of material is being used when SOLID INDIVIDUAL slanted lined are on the blue print?

_____________ (but slanted)

Answer 7

Cast iron, or General use.

Question 8

What type of material is being used when SOLID and DASHED slanted lined are on the blue print?

_____________
—————— (but slanted)
_____________

Answer 8

Copper Alloys.

(eg. bronze or brass)

Question 9

What type of material is being used when SOLID PAIRED slanted lined are on the blue print?
______________

______________
______________ (but slanted)

______________

Answer 9

Steel.

Question 10

In blueprint reading, what is the name of a “heavy solid line”

___________________

Answer 10

Object line.

Question 11

Describe the purpose of an object line.

_________________

Answer 11

A heavy solid line used to show visible edges in each view of the object.

Question 12

In blueprint reading, what is the name of a “heavy short dashed line”

———————

Answer 12

Hidden line.

Question 13

Describe the purpose of a hidden line.

————————

Answer 13

Hidden lines are used to illustrate edges and surfaces that are hidden behind the side of the object you are viewing.

Question 14

In blueprint reading, what is the name of a “thin, solid line with and arrow on each end.”

←→ (it shouldn’t have any dashes in it)

Answer 14

Dimension line.

Question 15

Describe the purpose of a dimension line.

←→ (it shouldn’t have any dashes in it)

Answer 15

Dimension lines are used to describe the thickness/ length of a part of the object.

Question 16

In blueprint reading, what is the name of a “thin, solid line extending from the object with a dimension line in between?”

___________________

Answer 16

Extension line.

It is important to note the extension line should never touch object line (outline of the object).

Extension lines will always have a corresponding dimension line.

Question 17

Describe the purpose of an extension line.

__________________

Answer 17

Extension lines continue or extend from the surface of the object and establish the size of the dimension, though they never touch the object line.

Question 18

In blueprint reading, what is the name of a “thin line that consists of short and long dashes.”

— - — - — - — - —

Answer 18

Centreline.

Question 19

In blueprint reading, what is the name of a “solid line with either an arrow or dot/ ball?”

<——-/-——• (the lines should be solid)

Answer 19

Leader lines.

Question 20

Describe the function of the leader line in blueprint reading.

<———-/———• (the lines should be solid)

Answer 20

Leader lines are used to draw attention to a specific point or area.

Question 21

Describe the purpose of the centreline

— - — - — - — - —

Answer 21

The centreline is used to indicate the exact centre of holes or radius’s.

ie. Punch/drill holes or curved corners.

Question 22

In blueprint reading, what is the name of a “long squared-ish ‘U’ curved line with two short dashes in between with arrows on both sides?”

^ ^
|___ _ _ ___ _ _ ___|

Answer 22

Section or cutting plane line.

Question 23

Describe the purpose of the cutting plane line.

^ ^
|___ _ _ ___ _ _ ___|

Answer 23

Cutting plane lines show the location and direction of hypothetical cuts made to show details on the inside of the object,

Question 24

Describe the purpose of the section line.

^ ^
|___ _ _ ___ _ _ ___|

Answer 24

The section line is used to indicate a cut had been made, as well as its location.

Question 25

In blueprint reading, what is the name of “multiple thin sloping lines”

///////////
//////////

Answer 25

Cross-hatching lines

Used to define section views.

Question 26

When a computer generated blueprint is completed, it is re-sized to fit the available space on the paper for what reason?

Answer 26

For plotting.

Question 27

When a computer image is resized to fit space on paper what is most important?

Answer 27

It is most important that the resulting change in scale is shown on the drawing.

Question 28

Describe a “break line”

Answer 28

When an object is consistently the same throughout, the image is “broken” or shortened to save space. This sectioning is indicated by a break line.