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43 Cards in this Set
- Front
- Back
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what is the purpose of placing manila paper or polyvinyl cover on the drawing surface?
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prevents indentations from being made in the soft wooden drawing board
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what adjustment can be made to make your line of sight perpendicular to the drawing surface?
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height of the drafting chair or stool
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what two things do the arrangement of your equipment for maximum comfort affect?
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it can improve your comfort and work
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what type of light is the easiest on your eye?
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natural north light
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what determines the type of drawing media you use for a perpendicular drawing?
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character, purpose, use of a drawing
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to be of value of construction forces, name three criteria that drawings must meet.
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accuracy, legibility, neatness
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what is a waste of time when preparing drawings?
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preparing a drawing to a higher degree of accuracy than necessary
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what are the two basic ANSI paper standards on which all drawing sizes are based?
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8 1/2 × 11 engineering standard
9 × 12 architectural standard |
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list the basic pieces of drafting equipment.
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pencils, technical fountain pens, a drawing board, parallel bar or drafting machine, triangles, scales, staying instruments, templates, erasing equipment t-square or parallel bar
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on what type of drafting media is plastic lead use?
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polyester drafting film
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what individual difference has an effect on the lead hardness you use to get the desired proper line weight?
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the pressure placed on the lead
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what is the order of inking?
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circles, arcs, regular and irregular curved, horizontal lines, vertical lines, inclined lines
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what are the two most common types of scales used?
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engineer and architect
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as a minimum, what instruments should your drawing set include?
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1 pair large dividers, 1 large compass, 1 small bow compass, 1 small bow divider, compass leads, spare points
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what is the prime advantage of using templates?
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the rapid and consistent duplication of detail
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each new position of irregular curve should fit how many plotted points on the drawing?
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3 or more points
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what is the purpose of lettering on a drawing?
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to help convey the information on the drawing
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what value is fancy lettering that cannot be interpreted by the user?
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none
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list the basic requirements for freehand lettering.
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letters must be legible
letters should actually look like the figures they represent lettering must be dark enough to reproduce letters should be uniform in shape |
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when should you use geometric construction and why?
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when accuracy is of importance and geometrical construction is greater than the accuracy of the instrumental method
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define geometric construction.
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a method of constructing a figure with the aid of a pencil, straightedge, and compass only
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one and only circle can be drawn through these
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3 points not in a line
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on these, all sides are equal and all angles are equal
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regular polygon
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the major and minor axes divide this figure into 4 equal segments
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bisector
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measure along this to find the distance between a point and a line
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perpendicular
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these lines are equidistant from each other at all points
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parallel
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on a parallelogram, these bisect each other
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diagonals
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only one of these can be drawn from a given point on a given line
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perpendicular
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you may intersect a line with these to cut the line into equal segments
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equally spaced parallel lines
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if two circles are tangent to each other, a straight line joining their centers passes through this
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point of tangency
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what is the greatest enemy of the accuracy of geometric construction?
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carelessness
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what are line conventions?
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symbols that furnish a means of representing or describing some basic aspect of a real object
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what type of line is used to define the end limits of the surface to suck the measurement on the dimension line applies?
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extension
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if you reduce the width of an arrowhead because of narrow space, what must you do to the length of the arrowhead?
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reduce it also
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to help in reading a drawing, how should you place dimensional notes on a drawing?
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to read from the bottom of a drawing
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if the dimension is in even feet, what else must you add to the notation?
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a dash and a zero follow the whole number
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define "tolerance"
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the difference between the allowable minimum and the allowable maximum dimension
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what is the tolerance of a part with a native dimension of 2 1/2 inches and limits of +- 1/8 inch?
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1/4 inch
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what type of dimensioning system is best to specify the location of several holes on a common arc?
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angular
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when you dimension cylinders, what is the best way to show the diameter?
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on the view in which the circular base plane shows as an edge
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define a "location dimension"
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one that specifies the position or distance relationship of one feature of an object with respect to another
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when dimensioning views, which view should show as many dimensions as practicable?
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in the principal view
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what is the result of grouping dimensions?
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improved clarity
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