Technical Drawings Flashcards
The two main types of technical drawings used in industry
Orthographic and Pictorial
The two types of projection in orthographic drawings are
First Angle and Third Angle
ISO stands for
International Standards Organization
First-angle projection is used where
Europe
Third-angle projection is used where
North America
In first-angle projection the object is viewed from
Left to right
In third-angle projection the object is viewed from
Right to left
The term Ortho means
At right angles (90 degrees)
The Plan view the object is viewed from
The top or bottom
Technical drawings are usually in
Orthographic projection
The most common pictorial drawings are termed
Isometric and oblique
What type of drawing are all the lines either vertical or at 30 degrees to horizontal
Isometric
What type of drawing is one face at right angles to the horizontal and the others are at an angle of 45 degrees to the horizontal
Oblique
Thick lines which indicate the visible outline of an object are called
Object lines
Thin, equally spaced broken lines are called
Hidden lines
Lines used to shorten the view of a long uniform section are called
Break lines
Parallel diagonal lines that identify a sectional view of an object are called
Section lines
Thin broken lines with short and long lines spaced alternately are called
Centerlines
Lines with letters such as A-A placed beside arrow keys to the corresponding sectional view are called
Cutting plane lines
Thin lines that extend the object lines out to a convenient space for dimensioning are called
Extension lines
Thin lines that indicate the distance between the extension lines are called
Dimension lines
All dimension figures except angular dimensions are written parallel to the dimension lines
Aligned dimensioning
All figures are written parallel to the bottom of the drafting paper
Unidirectional dimensioning
Arcs, rounds, or fillets are shown in the form of a
Radius measurement
Type of view used to show an aspect of the object which is otherwise too complicated to show with the conventional top, front, and side views
Sectional views
The types of sectional views are
Full-section, half-section, offset, aligned, revolved, removed, and broken-out
Views used to to detail sloping or inclining surfaces which cannot be depicted in normal orthographic views are
Auxiliary views
This type of view takes a very complicated drawing and separates it along a common axis to show how a group of parts fit together
Exploded view
MMC stands for
Maximum material condition
Tolerance in one direction only
Unilateral
This tolerance is read as a plus or minus a certain number
Bilateral
This method shows both the upper and lower limits together
Direct method
What type of fit can machined pieces be fitted by hand
Clearance fit
What type of fit requires heat or cold to assemble the piece
Interference fit
The two primary measurements used for surface texture are
Micrometre and micro-inch
Where is the title block located
Lower right hand side
The purpose of this block is to list any and all decisions made to the drawing after the initial drafting of the print
Revision block
This is a complete list of parts for that print or page
Materials list (items list)
This type of drawing shows the various pieces of a machine and the way they fit together as a complete unit
Assembly drawings
This diagram facilitates the tracing of hydraulic, pneumatic, or electrical lines and the components of each
Schematics
How many different planes are there in orthographic projection?
6
In orthographic projection the front view can also be called what?
Key view
The three types of pictorial views are?
Perspective, oblique, and isometric
In this pictorial drawing the front view is undistorted and the top and right side taper into the distance
Perspective
