Technical Drafting Q1

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Orthographic Projection

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27 Terms

1

Orthographic Projection

  • The exact representation of a figure

  • Process of representing 3d objects in 2d

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2

Multiview Projection, Parallel Projection

Other terms of Orthographic Projection

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3

Ortho-

Means straight, upright, vertical (Came from Greek word 'orthos' meaning straight, right, true)

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4

Graphic

marked by clear lifelike or vividly realistic description.

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5

Glass Box

unfolding and transferring the height, width, and depth

<p>unfolding and transferring the height, width, and depth</p>
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6

3 Principal Views

Front View Top View Right Side View

<p>Front View Top View Right Side View</p>
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7

3 Principal Planes

Frontal Plane Horizontal Plane Profile Plane

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8

Working Drawing

used as a reference or guide in the manufacture of a product.

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9

Assembly Drawing

[a part of working drawing dealing with] drawing various parts of a machine or structure assembled in their relative working positions.

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10

Alphabet of Lines

a list of line symbols that engineers and draftsmen use in technical drawings to communicate specific shapes, sizes or surfaces.

<p>a list of line symbols that engineers and draftsmen use in technical drawings to communicate specific shapes, sizes or surfaces.</p>
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11

Construction Lines

  • used to construct layout work (guidelines)

  • thin and very light, should not be erased

<ul><li><p>used to construct layout work (guidelines)</p></li><li><p>thin and very light, should not be erased</p></li></ul>
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12

Visible Lines

  • show outline of object, visible edges and surfaces.

  • thick and heavy

<ul><li><p>show outline of object, visible edges and surfaces.</p></li><li><p>thick and heavy</p></li></ul>
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13

Section Lines

  • medium lines drawn at 45 degrees

  • show interior view of solid areas of cutting plane line.

<ul><li><p>medium lines drawn at 45 degrees</p></li><li><p>show interior view of solid areas of cutting plane line.</p></li></ul>
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14

Hidden Lines

  • short dash lines

  • show non visible surfaces.

<ul><li><p>short dash lines</p></li><li><p>show non visible surfaces.</p></li></ul>
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15

Center Lines

  • long and short dash lines

  • usually indicates center of holes, circles and arcs

  • thin and dark

<ul><li><p>long and short dash lines</p></li><li><p>usually indicates center of holes, circles and arcs</p></li><li><p>thin and dark</p></li></ul>
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16

Dimension Lines

  • show the size of an object with a numeric value usually located in the middle of the line

  • usually with arrowheads or tick markings.

  • thin and dark

<ul><li><p>show the size of an object with a numeric value usually located in the middle of the line</p></li><li><p>usually with arrowheads or tick markings.</p></li><li><p>thin and dark</p></li></ul>
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17

Extension Lines

  • show the starting and ending of dimension.

  • thin and dark

<ul><li><p>show the starting and ending of dimension.</p></li><li><p>thin and dark</p></li></ul>
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18

Leader Lines

-medium line with arrowhead

  • show label for size (e.g., radii) or special information about a feature.

<p>-medium line with arrowhead</p><ul><li><p>show label for size (e.g., radii) or special information about a feature.</p></li></ul>
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19

Cutting Plane Lines

  • extra thick lines

  • show cutaway views or plane of projection where a section view is taken

  • arrow indicates the direction of view.

<ul><li><p>extra thick lines</p></li><li><p>show cutaway views or plane of projection where a section view is taken</p></li><li><p>arrow indicates the direction of view.</p></li></ul>
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20

Short Break Lines Long Break Lines

  • short and long medium line use to show cutaway view of a long section.

  • SBL are used when the hidden part is rather short, while LBL are used when it's longer

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21

Dimensioning

The process of adding size to a drawing information

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22

Aligned Dimensioning Unidirectional Dimensioning

Two systems of Dimensioning

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23

Aligned Dimensioning

  • numbers are aligned with the side of the feature being measured

  • if dimension lines are drawn vertically on the right side of a drawing, the numerals would be flipped on its right

  • dimension is written in two directions

<ul><li><p>numbers are aligned with the side of the feature being measured</p></li><li><p>if dimension lines are drawn vertically on the right side of a drawing, the numerals would be flipped on its right</p></li><li><p>dimension is written in two directions</p></li></ul>
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24

Unidirectional Dimensioning

  • reads from the bottom of the sheet and writes all numbers horizontally

  • dimension is written in the same direction in the whole drawing

<ul><li><p>reads from the bottom of the sheet and writes all numbers horizontally</p></li><li><p>dimension is written in the same direction in the whole drawing</p></li></ul>
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25

Arc

curved line that is a part of a circle

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26

Fillet

  • rounded sides of a polygon's vertices -ex. tables with rounded corners

<ul><li><p>rounded sides of a polygon&apos;s vertices -ex. tables with rounded corners</p></li></ul>
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27

Chamfer

  • the sloped or angled edges or corners of a part design

  • straight and sharp angle, opposite of fillet

<ul><li><p>the sloped or angled edges or corners of a part design</p></li><li><p>straight and sharp angle, opposite of fillet</p></li></ul>
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