TRADES - Technical Drafting

A type of axonometric projection that’s 30 degrees from the base

Isometric

An oblique projection with lines of projection at a 45 degrees angle to the plane of projection

cavalier

A drawing that shows how different parts of an object go together

assembly drawing

A type of orthographic projection used for creating a pictorial drawing of an object, where the lines of sight are perpendicular to the plane isometric projection of projection, and the object is rotated around one or more of its axes to reveal multiple sides

axonometric projection

a drawing showing a single part of a machine

detailed drawing

the curve traced by a point on a circle as it rollsalong a straight line without slipping

cycloid

an instrument used when drawing arcs and circle

compass

the mechanism of linear measurement which it is based on the standard meter

metric system

the meaning of EDPS

Electronic Data Processing System

An oblique projection in mechanical drawing in whichdimensions parallel to the third axis of the object are shortened one half to overcome apparent distortion

cabinet

a process for making accurate drawings using special drawing tools and instuments

mechaical drafting

a drawing instrument used when transferring measurements, dividing lines, arcs into the desired number of equal parts

divider

a plane curve surrounding two focal points, such that for all points n the curve, the sm of the two distances to the focal points is a constant

ellipse

a technical drawing that shows a 3-dimensional cube with one side if the cube smaller in proportion to the other two sides

diametric projection

a technique of illustration by which a standardized series of orthographic two-dimensional pictures are constricted to represent the form of three-dimensional object

multi view projection

a mechanis of linear measurement where it is based on standard foot

english system

an umbrella term that covers the art of drawing letters, instead of simply writing them

lettering

the art of drawing solid objects on a two-dimensional surface so as to give the right impression of their height, width, depth, and position in relation to each other when viewed from a particular point.

perspective

drawing which means that the illustratio has a single vanishing oint, usually (though not necessarily) directly opposite the viewer’s eye and usually (though not necessarily) on the horizon line. All lines parallel with the viewer’s line of sight recede to the horizon towards this vanishing point

one-point perspective

the object is presented into two or more views by projecting the outline into the planes of projection perpendicular to each other

orthographic drawing

a quickly executed freehand drawing that is not intended as a finished work

sketch

the presentation of an object where it is viewed showing the three faces of an object are shown

pictorial view

uses three sets of orthogonal lines and three vanishing points to draw each object

three point perspective

used in determining gradations of the degrees when measuring arcs and circles

protractor

a type of axonometric projection in which the object is shown with all three of its principal axes tilted unequally from the plane of viewing

trimetric projection

uses two vanishing points placed on the horizon line

two-point perspective

A type of axonometric projection that is 45 degrees and 15 degrees

Trimetric

In pictorial drawings, how many faces are shown?

3

A form of design communication based on line symbols recognized and understood worldwide

Technical drawings

Technical drawings are often referred to as

Universal language

Short dash lines used to show non-visible surfaces (usually medium thickness)

Hidden line

The line symbols used in technical drawings are often referred to as

Alphabet of lines

short and long medium line used to show cutaway view

short and long break lines

very light and thin line used to construct layout work

construction line

thin and dark line used to show the starting and ending of dimension

Extension line

Thick, dark line used to sow outline of object, visile edges, and surfaces

Object of visible line

medium line drawn at 45 degrees used to show interior view of cutting plane

section line

extra thick lines used to show cutaway views or plane of projection where a section view is taken. Arrow indicates the direction of view

cutting plane line

medium line followed by two short dashes to show altenate position of a moving part

phantom line

long and short dash lines usually used to indicate center of holes, circles, and arcs (thin and dark)

center line

medium line with arrowhead to show notes or label for size or special information about a picture

leader line