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41 Cards in this Set
- Front
- Back
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Sketch drawings
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Sketches are typically freehand drawings that are created during the preliminary phase of a design.Sketches are used while brainstorming ideas, inventing, exploring alternatives, etc. quick, effiecent.
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Techinical Drawings
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Technical drawings are more formal than sketches.
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Scale
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The scale is the ratio of the drawing size to the actual size.
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Porportional
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Since freehand sketches are intended to be performed relatively quickly, it is not necessary to ensure that a sketch is scaled, but it must at least be proportionally correct. In other words, the sketch should not be grossly distorted.
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3rd Angle Projection
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The front view is the main view, the top view is on top, and the right-side view is on the right.
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2 View Drawing
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Front and right-side views
Top and Front (perferred) |
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How many Angle Brackets are required?
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4
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Name the materials specified for the Angle Bracket?
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Cast Iron
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State the order number of the Bracket
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4-57
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What is the overall width (length) of the Bracket?
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2.75
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What is the overall height
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1.50
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What is the overall depth
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1.63
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What is dimension A?
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1.25
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What is dimension B?
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0.38
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What surface in the top view is represented by line C in the right side view?
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H
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Name the three views that are used to describe the shape and size of the part.
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Top, Front, and Right Side
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What surface is the top view is represented by line D in the right side view?
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G
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What line in the right side view represents surface F in the front view?
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P
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What line in the right side view represents surface J in the front view?
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K
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What line in the top view represents surface O in the right side view?
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N
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What line in the front view represents surface H in the top view?
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E
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What line in the right side view represents surface H in the top view?
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C
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What kind of lines are E, L, C, D, and K?
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Object Lines
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What kind of lines are A and B?
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Dimension Lines
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What encircled letter denotes an extension line?
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Q
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What encircled letter in the front view denotes an object line?
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E
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1st Angle projection
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the top view is located below the front view, and the left-side view is located to the right.
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Which Angle Projection is used in the U.S. and Canada?
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3rd Angle Projection
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baseline dimensioning
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The practice of referencing all locations from an established point or edge helps to overcome inaccuracies due to surface irregularities
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placing dimensions by drawing extension lines which originate approximately ________ from the object and extend _________ beyond the arrowhead.
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1/16th inch (1.5 mm)
1/8th inch (3 mm) |
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__________ dimensioning is preferred over _________ dimensions.
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Continuous
staggering |
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counterbored hole
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one that has been machined to a larger diameter for a specified depth so that a bolt or pin will fit into this recessed hole.
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countersunk hole
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a cone-shaped recess that is machined in a part to receive a flat-head screw or bolt
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12o15’45”
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12 + 15/60 + 45/3600 = 12.26o
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Unilateral tolerances
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allows deviation from the nominal (or basic) dimension in one direction
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Bilateral tolerances
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allow for deviation in both directions
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True or False? Bilateral tolerances do not always have to be the same in both directions
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True
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Screw threads can be drawn using one of three methods
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Pictorial – shows threads exactly as they appear.
Schematic – not as detailed as the pictorial representation Simplified – typically what is used |
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External threads
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threads that are visible on the outside of the object, like the threads on a bolt.
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Internal threads
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threads that are formed inside an object, like the threads on a nut.
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The 4 types of technical drawings
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Orthographic
Axonometric Oblique Perspective |
