Basic Drafting Section 1; Pg 8-16 Flashcards

To remember

1
Q

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

A

Two. Pg 8

Orthographic Projection.
Pictorial.

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2
Q

Describe an “Orthographic Projection”

A

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.

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3
Q

What method is used to create an Orthographic Projection?

A

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

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4
Q

Describe a Pictorial Drawing.

A

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).

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5
Q

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

A

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.

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6
Q

What is the use of Alphabet lines?

A

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

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7
Q

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

_____________ (but slanted)

A

Cast iron, or General use.

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8
Q

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

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

A

Copper Alloys.

(eg. bronze or brass)

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9
Q

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

______________
______________ (but slanted)

______________

A

Steel.

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10
Q

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

___________________

A

Object line.

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11
Q

Describe the purpose of an object line.

_________________

A

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

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12
Q

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

———————

A

Hidden line.

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13
Q

Describe the purpose of a hidden line.

————————

A

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

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14
Q

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)

A

Dimension line.

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15
Q

Describe the purpose of a dimension line.

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

A

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

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16
Q

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

___________________

A

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.

17
Q

Describe the purpose of an extension line.

__________________

A

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.

18
Q

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

— - — - — - — - —

A

Centreline.

19
Q

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

<——-/-——• (the lines should be solid)

A

Leader lines.

20
Q

Describe the function of the leader line in blueprint reading.

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

A

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

21
Q

Describe the purpose of the centreline

— - — - — - — - —

A

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

ie. Punch/drill holes or curved corners.

22
Q

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?”

^ ^
|___ _ _ ___ _ _ ___|

A

Section or cutting plane line.

23
Q

Describe the purpose of the cutting plane line.

^ ^
|___ _ _ ___ _ _ ___|

A

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

24
Q

Describe the purpose of the section line.

^ ^
|___ _ _ ___ _ _ ___|

A

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

25
Q

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

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

A

Cross-hatching lines

Used to define section views.

26
Q

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

A

For plotting.

27
Q

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

A

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

28
Q

Describe a “break line”

A

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.