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104 Cards in this Set
- Front
- Back
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Concentric Circles
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Circles of different diameter that have the same center point.
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Isometric Lines
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Lines on an isometric drawing that are parrallel to one of the faces of the isometric axes.
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Nonisometric Lines
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Lines that are not parrallel to the isometric axes.
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Isometric Sketch
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A sketch that shows height, width, and depth of an object by using three axes set at 120 degrees angles to one another.
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Oblique Sketch
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A sketch in which the height and width are shown in their true size (with axes at 90 degrees to each other), but in which the depth can be drwan at any angle.
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Overlay
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A piece of tracing paper placed on top of a sketch or drawing so that you can see the drawing through it.
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Tangent
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An Arc, line, or circle that touches another arc, line, or circle at one point only.
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Proportion
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Size relitive to the size of other objects in the same drawing.
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Alphabet of Lines
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The various lines and line symbols that have specific meanings when used on technical drawings.
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What type of paper is used for the overlay method?
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Tracing paper
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What is the term used in estimating proportions?
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Eyeball
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What is another name for multiview drawing?
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orthographic projection.
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Name 3 basic types of pictorial sketching.
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oblique, isometric, and prospective.
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What are the 3 principle planes of projection and what views appears on each plane?
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Veritcal plane, horizontal plane, and profile plane.
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What two shapes can be used for a pencil point?
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cone, and circle.
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Mechanical pencils can also be called...
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lead holders
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How many thicknesses of lines are generally used in drafting?
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3
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what is the name of the instrument used to measure or lay out angles?
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protractor
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Which command in AutoCAD to customize text and font style.
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style.
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When erasing a pencil line drawn on film, move the eraser...
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Across the line.
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A____ compass is used to draw arcs or circles with large radii.
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Beam
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While angles are commonly gven in degrees, minutes and seconds, the use of ___ is now becoming more popular.
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Decimal degrees
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The 45 degrees and the 30-60 degrees triangles can be combined to form angles in increments of...
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15 degrees
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An angle of 25, 30'36" is the same as...
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25.51
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Technical drawing done electronically are prepared on a
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CAD system.
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The compass best suited for drawing very samall circles is the___ Compass.
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drop-spring bow
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The differen lines, or line symbols, used on technical drawings are called...
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The alphabet of lines
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A straight or curved line identical on both sides of a point or axis is
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symmetrical
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the compass is never used to transfer distances
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false
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CAD systems are rapidly replacing manual drafting equipment.
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true
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Drafters generally used adhesive tape to fasten the drawing sheet to the board.
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false
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An erasing template is used to avoid erasing nearby lines accidently.
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true
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dividers can be used to transfer distances on a drawing.
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true
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line weight refers only to the thickness of lines.
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false
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the slant on the outside of the compass lead is also called bevel.
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true
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saftey is seldom a concern in the drafting room.
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false
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short break lines are thin
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true
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CAD drawings are almost always created at full size
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false
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One of the most convenient ways to set up an AutoCAD drawing to conform to ANSI or ISO standards is to use one of AutoCAD's drawing templates.
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true
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AutoCAD operators do most of their drawing in paper space.
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false
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Layers in AutoCAD have a continuous linetype by default.
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true
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The nonprinting pattern of dots in an AutoCAD drawing that provides a visual reference for the CAD operator is set using the GRID command.
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true
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the instrument used in maual drafting to divide lines and transfer distances is the
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dividers
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the process of creating technical drawings using technicals pens is called...
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inking
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curved lines that are not true circles or arcs are drawn with a(n)
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irregular curve
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the physical size boundaries of a CAD drawing are known as its
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limits
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in AutoCAD, a___ is similar to an overlay on a board-drafted document.
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layers
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in AutoCAD the ___ command is used to create straight lines.
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line
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The ___ mode in AutoCAD forces every line you create to be either vertical of horizontal.
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snap
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A CAD line that consists of segments that can be either curved or straight is a(n)
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poly line
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list the 5 major components of a CAD system
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computer, monitor, keyboard, mouse, printer.
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Always draw curves to the points of ___ first.
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Tangency
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Name the line that shows where a measurement begins and ends.
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dimension line
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the dimension system in which the numerals are placed in line with the dimension line is called the ___ system.
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horizontal
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Angles may be dimensioned by degrees, minutes and seconds or by ___ angles.
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decimalized
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Diameter
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circle w/ a line drawn through it.
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Inch
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In.
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Centerline
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CL
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Millimeter
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ML
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Radius
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R
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Tolerence
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Tol
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Outside diameter
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idk
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countersink
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idk
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The amount by which the accuracy of a part may vary from the absolute measurment is called ___
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Tolerence
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Explain the difference between a datum feature and a simulated datum.
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The datum part is any physical portion of a part. The simulated datum is what the datum feature contacts and should imitate the mating part in the assembly.
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Auxiliary Section
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A Section that results from a cutting plane that is not parallel to any of the normal views.
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Broken out section
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a section that shows an object as it would look if a portion of it were removed by a cutting plane and the broken off to reveal the cut surface. pg 267
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conventional break
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a break that allows a uniform part of a very long object to be removed making it easier to draw and understand. pg 274
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crosshatching
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evenly spaced lines that show a cut surface on a section. also called section lining. 261
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cutting plane
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the plane through an object at which a section is created. pg 262
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cutting plane line
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a line on a normal view that shows wehre the cutting plane passes through an object.
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Full section
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A sectional view that shows an object as if it were cut completly apart from one end or side to the other.
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half section
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a section in which one quarter of the original object has been cut away; one half of a full section.
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offset section
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a section in which the cutting plane is not a straight line but shifts at one or more places to show a detail of miss a part.
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phantom section
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a hidden section used to show, in one view, the inside and outside of an object that is not completely symmetrical.
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removed section
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a section that has been moved from its normal place to somewhere else on the drawing sheet.
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revolved section
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a section view that is revolved at 90 degrees so that you can see the whole object.
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ribs
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a thin flat part of an object used to strenghthen of brace another part of an object.
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section lining
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thin evenly spaced lines that show a cut surface on a section. also call crosshatching.
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webs
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a thin flat part of an object used to strengthen of brace another part of the object.
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General purpose section lining may also be used to designate what material?
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Cast Iron
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What type of line is used to show where a section is to be taken.
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cutting plane line
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when a cuttin plane line passes through an entire view, a ___ section results.
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full
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How are thin sections usually shown on a drawing?
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the entire sectioned area is blackened in.
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If you were drawing a sectional view of a symmetrical object, what type of section would you use?
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Half Section
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For drawings that contain several sectioned areas, why might it be faster to use a CAD program that to create the same drawing manually?
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because the CAD system already has sections lines pre created on the hardware so a person would jus have to insert them.
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When one quarter of the object is cut away, a ___ section results.
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half
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a revolved section is rotated ___.
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90 degrees
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Name 4 items that are generally not sectioned even when the cutting plane passes through their axis.
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spokes, gear teeth, shafts, bolts, pins, and rivets.
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A ___ section is used to show both inside and outside details of a nonsymmetrical object.
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phantom
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What is the proper position for a removed section on a drawing?
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the normal way they would look, do not rotate them the wrong direction.
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Give an example of the use of alternate section lines to clarify a drawing.
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used to show a rib or web
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Explain how a conventional break can make the detail easier to understand in the drawing of a very long object.
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you dont have to look at the whole object you can get what you need to know from a shorter part of the object.
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Auxiliary View
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a projection on an auxiliary plane that is parallel to an inclined surface. it is a view that looks directly at the inclined surface in a direction perpendicular to it, providing a clear, undistorted image of its shape and size.
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Auxiliary Plane
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a plane that is parallel to an inclined surface on an object.
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Edge View
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the inclined plane appears as a line in this view.
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Primary Auxiliary
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auxiliary views developed directly from the normal views.
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Partial Auxiliary
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an auxiliary view in which some elements have been omitted for clarity.
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auxiliary section
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a section that results from a cutting plane that is not parallel to any of the normal views.
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secondary auxiliary
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a view that has been projected from a primary auxiliary view; used to find the true size and shape of an inclined surface that lies on an oblique plane.
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oblique plane
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in decriptive geometry a line that appears inclined in all three reference planes.
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reference plane
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the plane associated with the edge view from which the auxiliary plane will be developed.
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revolution
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a drawing in which the object has been revolved or turned to plave its primary features parallel to the reference planes.
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axis of revolution
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an imaginary axis, perpendicular to one of the three principal planes, about which the object is revolved in a drawing.
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